{"id":"CVE-2021-22890","aliases":["ALPINE-CVE-2021-22890","BELL-CVE-2021-22890","CURL-CVE-2021-22890","DEBIAN-CVE-2021-22890","DSA-4881-1","EUVD-2021-10022","GHSA-5cwr-528x-3vwc","JLSEC-2025-27","MGASA-2021-0186","OESA-2021-1170","RHSA-2021:2472","SUSE-SU-2021:1006-1","UBUNTU-CVE-2021-22890","USN-4898-1","openSUSE-SU-2021:0510-1","openSUSE-SU-2024:10582-1"],"status":"published","title":"curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to...","description":"curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to MITM a connection due to bad handling of TLS 1.3 session tickets. When using a HTTPS proxy and TLS 1.3, libcurl can confuse session tickets arriving from the HTTPS proxy but work as if they arrived from the remote server and then wrongly \"short-cut\" the host handshake. When confusing the tickets, a HTTPS proxy can trick libcurl to use the wrong session ticket resume for the host and thereby circumvent the server TLS certificate check and make a MITM attack to be possible to perform unnoticed. Note that such a malicious HTTPS proxy needs to provide a certificate that curl will accept for the MITMed server for an attack to work - unless curl has been told to ignore the server certificate check.","severity":{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"low","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.03057,"percentile":0.87779,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-290","CWE-300"],"published":"2021-03-30T00:00:00Z","modified":"2026-10-25T01:05:36Z","fixes":[{"ecosystem":"Alpine:v3.12","package":"curl","fixed_in":["7.76.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.13","package":"curl","fixed_in":["7.76.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.14","package":"curl","fixed_in":["7.76.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.15","package":"curl","fixed_in":["7.76.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.16","package":"curl","fixed_in":["7.76.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"curl","fixed_in":["7.76.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"curl","fixed_in":["7.76.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"curl","fixed_in":["7.76.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"curl","fixed_in":["7.76.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"curl","fixed_in":["7.76.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"curl","fixed_in":["7.76.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"curl","fixed_in":["7.76.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"curl","fixed_in":["7.76.0-r0"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"curl","fixed_in":["7.74.0-1.2"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"curl","fixed_in":["7.74.0-1.2"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"curl","fixed_in":["7.74.0-1.2"],"sources":["osv"]},{"ecosystem":"Julia","package":"LibCURL_jll","fixed_in":["7.81.0+0"],"sources":["osv"]},{"ecosystem":"Ubuntu:20.04:LTS","package":"curl","fixed_in":["7.68.0-1ubuntu2.5"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.12","package":"curl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.76.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.13","package":"curl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.76.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.14","package":"curl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.76.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.15","package":"curl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.76.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.16","package":"curl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.76.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.17","package":"curl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.76.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.18","package":"curl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.76.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.19","package":"curl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.76.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.20","package":"curl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.76.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.21","package":"curl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.76.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.22","package":"curl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.76.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.23","package":"curl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.76.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.24","package":"curl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.76.0-r0"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"curl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.74.0-1.2"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"curl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.74.0-1.2"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"curl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.74.0-1.2"}]}]},{"source":"osv","ecosystem":"Debian:10","package":"curl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.64.0-4+deb10u2"}]}],"versions":["7.64.0-4","7.64.0-4+deb10u1"],"bundled":8},{"source":"osv","ecosystem":"Julia","package":"LibCURL_jll","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"7.81.0+0"}]}]},{"source":"osv","ecosystem":"Mageia:7","package":"curl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.71.0-1.2.mga7"}]}],"bundled":2},{"source":"osv","ecosystem":"Mageia:8","package":"curl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed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url":"https://bugzilla.suse.com/1183934","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2021-22876","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-22890","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2021-22890","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-4898-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-22876","tags":["report"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/HDAO4Q3JZASM6AK274RF74JN2GJOK5UE/","tags":["advisory"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2006-1061","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-9586","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-9594","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-1000099","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-1000100","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-1000101","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-1000254","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-1000257","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-2629","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-7468","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-8816","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-8817","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-8818","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-9502","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-0500","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-1000005","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-1000120","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-1000122","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-1000300","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-1000301","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-14618","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-16839","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-16840","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-16842","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-16890","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-15601","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-3822","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-3823","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-5435","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-5436","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-5481","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-5482","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8169","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8231","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8284","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8285","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8286","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-22297","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-22298","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-22898","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-22901","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-22922","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-22924","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-22945","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-22946","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-22947","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2021-22890","description":"curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to MITM a connection due to bad handling of TLS 1.3 session tickets. When using a HTTPS proxy and TLS 1.3, libcurl can confuse session tickets arriving from the HTTPS proxy but work as if they arrived from the remote server and then wrongly \"short-cut\" the host handshake. When confusing the tickets, a HTTPS proxy can trick libcurl to use the wrong session ticket resume for the host and thereby circumvent the server TLS certificate check and make a MITM attack to be possible to perform unnoticed. Note that such a malicious HTTPS proxy needs to provide a certificate that curl will accept for the MITMed server for an attack to work - unless curl has been told to ignore the server certificate check.","status":"published","published":"2021-04-01T17:46:17Z","modified":"2026-10-14T10:15:43.043Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","level":"medium","assessor":"adp"}],"cwes":["CWE-300"],"updated_at":"2026-11-02T14:32:57.701381Z"}],"euvd":[{"id":"EUVD-2021-10022","description":"curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to MITM a connection due to bad handling of TLS 1.3 session tickets. When using a HTTPS proxy and TLS 1.3, libcurl can confuse session tickets arriving from the HTTPS proxy but work as if they arrived from the remote server and then wrongly \"short-cut\" the host handshake. When confusing the tickets, a HTTPS proxy can trick libcurl to use the wrong session ticket resume for the host and thereby circumvent the server TLS certificate check and make a MITM attack to be possible to perform unnoticed. Note that such a malicious HTTPS proxy needs to provide a certificate that curl will accept for the MITMed server for an attack to work - unless curl has been told to ignore the server certificate check.","status":"published","published":"2021-04-01T17:46:17Z","modified":"2026-10-14T10:15:43Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T17:27:16.85534Z"}],"ghsa":[{"id":"GHSA-5cwr-528x-3vwc","title":"curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to...","description":"curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to MITM a connection due to bad handling of TLS 1.3 session tickets. When using a HTTPS proxy and TLS 1.3, libcurl can confuse session tickets arriving from the HTTPS proxy but work as if they arrived from the remote server and then wrongly \"short-cut\" the host handshake. When confusing the tickets, a HTTPS proxy can trick libcurl to use the wrong session ticket resume for the host and thereby circumvent the server TLS certificate check and make a MITM attack to be possible to perform unnoticed. Note that such a malicious HTTPS proxy needs to provide a certificate that curl will accept for the MITMed server for an attack to work - unless curl has been told to ignore the server certificate check.","status":"published","published":"2022-05-24T17:46:04Z","modified":"2026-10-14T12:32:24Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"cwes":["CWE-290","CWE-300"],"updated_at":"2026-11-02T15:13:24.812204Z"}],"nvd":[{"id":"CVE-2021-22890","description":"curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to MITM a connection due to bad handling of TLS 1.3 session tickets. When using a HTTPS proxy and TLS 1.3, libcurl can confuse session tickets arriving from the HTTPS proxy but work as if they arrived from the remote server and then wrongly \"short-cut\" the host handshake. When confusing the tickets, a HTTPS proxy can trick libcurl to use the wrong session ticket resume for the host and thereby circumvent the server TLS certificate check and make a MITM attack to be possible to perform unnoticed. Note that such a malicious HTTPS proxy needs to provide a certificate that curl will accept for the MITMed server for an attack to work - unless curl has been told to ignore the server certificate check.","status":"published","published":"2021-04-01T18:15:12.917Z","modified":"2026-10-14T11:16:52.373Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"low","assessor":"primary"},{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-300","CWE-290"],"updated_at":"2026-11-02T14:06:51.197859Z"}],"osv":[{"id":"ALPINE-CVE-2021-22890","description":"curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to MITM a connection due to bad handling of TLS 1.3 session tickets. When using a HTTPS proxy and TLS 1.3, libcurl can confuse session tickets arriving from the HTTPS proxy but work as if they arrived from the remote server and then wrongly \"short-cut\" the host handshake. When confusing the tickets, a HTTPS proxy can trick libcurl to use the wrong session ticket resume for the host and thereby circumvent the server TLS certificate check and make a MITM attack to be possible to perform unnoticed. Note that such a malicious HTTPS proxy needs to provide a certificate that curl will accept for the MITMed server for an attack to work - unless curl has been told to ignore the server certificate check.","status":"published","published":"2021-04-01T18:15:12.917Z","modified":"2026-10-23T17:17:56.150332649Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"updated_at":"2026-11-02T15:27:48.646074Z"},{"id":"BELL-CVE-2021-22890","title":"CVE-2021-22890 does not affect BellSoft software","status":"withdrawn","published":"2023-08-31T12:15:38.178031Z","modified":"2026-01-26T09:47:15.930974Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"updated_at":"2026-11-02T15:28:15.925958Z"},{"id":"CVE-2021-22890","description":"curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to MITM a connection due to bad handling of TLS 1.3 session tickets. When using a HTTPS proxy and TLS 1.3, libcurl can confuse session tickets arriving from the HTTPS proxy but work as if they arrived from the remote server and then wrongly \"short-cut\" the host handshake. When confusing the tickets, a HTTPS proxy can trick libcurl to use the wrong session ticket resume for the host and thereby circumvent the server TLS certificate check and make a MITM attack to be possible to perform unnoticed. Note that such a malicious HTTPS proxy needs to provide a certificate that curl will accept for the MITMed server for an attack to work - unless curl has been told to ignore the server certificate check.","status":"published","published":"2021-04-01T18:15:12.917Z","modified":"2026-10-24T10:30:30.251229017Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"updated_at":"2026-11-02T15:44:18.367807Z"},{"id":"DEBIAN-CVE-2021-22890","description":"curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to MITM a connection due to bad handling of TLS 1.3 session tickets. When using a HTTPS proxy and TLS 1.3, libcurl can confuse session tickets arriving from the HTTPS proxy but work as if they arrived from the remote server and then wrongly \"short-cut\" the host handshake. When confusing the tickets, a HTTPS proxy can trick libcurl to use the wrong session ticket resume for the host and thereby circumvent the server TLS certificate check and make a MITM attack to be possible to perform unnoticed. Note that such a malicious HTTPS proxy needs to provide a certificate that curl will accept for the MITMed server for an attack to work - unless curl has been told to ignore the server certificate check.","status":"published","published":"2021-04-01T18:15:12.917Z","modified":"2026-10-15T09:47:43.150351322Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"updated_at":"2026-11-02T15:45:34.637046Z"},{"id":"JLSEC-2025-27","title":"curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to...","description":"curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to MITM a connection due to bad handling of TLS 1.3 session tickets. When using a HTTPS proxy and TLS 1.3, libcurl can confuse session tickets arriving from the HTTPS proxy but work as if they arrived from the remote server and then wrongly \"short-cut\" the host handshake. When confusing the tickets, a HTTPS proxy can trick libcurl to use the wrong session ticket resume for the host and thereby circumvent the server TLS certificate check and make a MITM attack to be possible to perform unnoticed. Note that such a malicious HTTPS proxy needs to provide a certificate that curl will accept for the MITMed server for an attack to work - unless curl has been told to ignore the server certificate check.","status":"published","published":"2025-10-10T15:04:01.319Z","modified":"2026-07-23T22:30:27.704877656Z","cvss":[{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N","level":"medium"},{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"updated_at":"2026-11-02T15:47:17.805107Z"},{"id":"OESA-2021-1170","title":"curl security update","description":"cURL is a computer software project providing a library (libcurl) and command-line tool (curl) for transferring data using various protocols.\r\n\r\nSecurity Fix(es):\r\n\r\ncurl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to MITM a connection due to bad handling of TLS 1.3 session tickets. When using a HTTPS proxy and TLS 1.3, libcurl can confuse session tickets arriving from the HTTPS proxy but work as if they arrived from the remote server and then wrongly \u0026quot;short-cut\u0026quot; the host handshake. When confusing the tickets, a HTTPS proxy can trick libcurl to use the wrong session ticket resume for the host and thereby circumvent the server TLS certificate check and make a MITM attack to be possible to perform unnoticed. Note that such a malicious HTTPS proxy needs to provide a certificate that curl will accept for the MITMed server for an attack to work - unless curl has been told to ignore the server certificate check.(CVE-2021-22890)\r\n\r\ncurl 7.1.1 to and including 7.75.0 is vulnerable to an \u0026quot;Exposure of Private Personal Information to an Unauthorized Actor\u0026quot; by leaking credentials in the HTTP Referer: header. libcurl does not strip off user credentials from the URL when automatically populating the Referer: HTTP request header field in outgoing HTTP requests, and therefore risks leaking sensitive data to the server that is the target of the second HTTP request.(CVE-2021-22876)","status":"published","published":"2021-05-06T11:04:24Z","modified":"2026-08-18T01:15:34.133646757Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:52:38.987987Z"},{"id":"RHSA-2021:2472","title":"Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.37 SP8 security update","status":"published","published":"2024-09-22T17:21:11Z","modified":"2026-10-15T10:01:58Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:08.619234Z"},{"id":"UBUNTU-CVE-2021-22890","description":"curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to MITM a connection due to bad handling of TLS 1.3 session tickets. When using a HTTPS proxy and TLS 1.3, libcurl can confuse session tickets arriving from the HTTPS proxy but work as if they arrived from the remote server and then wrongly \"short-cut\" the host handshake. When confusing the tickets, a HTTPS proxy can trick libcurl to use the wrong session ticket resume for the host and thereby circumvent the server TLS certificate check and make a MITM attack to be possible to perform unnoticed. Note that such a malicious HTTPS proxy needs to provide a certificate that curl will accept for the MITMed server for an attack to work - unless curl has been told to ignore the server certificate check.","status":"published","published":"2021-03-31T06:00:00Z","modified":"2026-04-22T12:48:14.902338Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"low"},{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:54:26.29421Z"},{"id":"CURL-CVE-2021-22890","title":"TLS 1.3 session ticket proxy host mix-up","description":"Enabled by default, libcurl supports the use of TLS 1.3 session tickets to\nresume previous TLS sessions to speed up subsequent TLS handshakes.\n\nWhen using an HTTPS proxy and TLS 1.3, libcurl can confuse session tickets\narriving from the HTTPS proxy but work as if they arrived from the remote\nserver and then wrongly \"short-cut\" the host handshake. The reason for this\nconfusion is the modified sequence from TLS 1.2 when the session ids would\nprovided only during the TLS handshake, while in TLS 1.3 it happens post\nhand-shake and the code was not updated to take that changed behavior into\naccount.\n\nWhen confusing the tickets, an HTTPS proxy can trick libcurl to use the wrong\nsession ticket resume for the host and thereby circumvent the server TLS\ncertificate check and make a MITM attack to be possible to perform unnoticed.\n\nThis flaw can allow a malicious HTTPS proxy to MITM the traffic. Such a\nmalicious HTTPS proxy needs to provide a certificate that curl accepts for the\nMITMed server for an attack to work - unless curl has been told to ignore the\nserver certificate check.","status":"published","published":"2021-03-31T08:00:00Z","modified":"2026-10-25T01:05:36.831648192Z","updated_at":"2026-11-02T15:43:55.669514Z"},{"id":"DSA-4881-1","title":"curl - security update","status":"published","published":"2021-03-30T00:00:00Z","modified":"2026-03-09T02:10:40.275019Z","updated_at":"2026-11-02T15:46:17.19998Z"},{"id":"MGASA-2021-0186","title":"Updated curl packages fix security vulnerabilities","description":"libcurl does not strip off user credentials from the URL when automatically\npopulating the Referer: HTTP request header field in outgoing HTTP requests,\nand therefore risks leaking sensitive data to the server that is the target of\nthe second HTTP request. (CVE-2021-22876)\n\nTLS 1.3 session ticket proxy host mixup. (CVE-2021-22890)\n","status":"published","published":"2021-04-12T19:59:59Z","modified":"2026-04-16T04:43:38.133881842Z","updated_at":"2026-11-02T15:49:41.509337Z"},{"id":"openSUSE-SU-2021:0510-1","title":"Security update for curl","description":"This update for curl fixes the following issues:\n\n- CVE-2021-22890: TLS 1.3 session ticket proxy host mixup (bsc#1183934)\n- CVE-2021-22876: Automatic referer leaks credentials (bsc#1183933)\n\nThis update was imported from the SUSE:SLE-15-SP2:Update update project.","status":"published","published":"2021-04-04T22:05:55Z","modified":"2026-02-04T04:35:50.254268Z","updated_at":"2026-11-02T16:58:31.879684Z"},{"id":"openSUSE-SU-2024:10582-1","title":"curl-7.79.1-1.1 on GA media","description":"These are all security issues fixed in the curl-7.79.1-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T04:40:36.472951Z","updated_at":"2026-11-02T16:58:34.487567Z"},{"id":"SUSE-SU-2021:1006-1","title":"Security update for curl","description":"This update for curl fixes the following issues:\n\n- CVE-2021-22890: TLS 1.3 session ticket proxy host mixup (bsc#1183934)\n- CVE-2021-22876: Automatic referer leaks credentials (bsc#1183933)\n","status":"published","published":"2021-04-01T15:45:04Z","modified":"2026-02-04T03:36:39.015127Z","updated_at":"2026-11-02T15:53:48.690034Z"},{"id":"USN-4898-1","title":"curl vulnerabilities","description":"Viktor Szakats discovered that curl did not strip off user credentials\nfrom referrer header fields. A remote attacker could possibly use this\nissue to obtain sensitive information. (CVE-2021-22876)\n\nMingtao Yang discovered that curl incorrectly handled session tickets when\nusing an HTTPS proxy. A remote attacker in control of an HTTPS proxy could\nuse this issue to bypass certificate checks and intercept communications.\nThis issue only affected Ubuntu 20.04 LTS and Ubuntu 20.10.\n(CVE-2021-22890)\n","status":"published","published":"2021-03-31T10:50:52Z","modified":"2026-04-22T10:13:57.538577Z","updated_at":"2026-11-02T16:58:15.159055Z"}]}}