{"id":"CVE-2021-22901","aliases":["ALPINE-CVE-2021-22901","AZL-6360","BELL-CVE-2021-22901","CURL-CVE-2021-22901","EUVD-2021-10033","GHSA-vjwf-ghhc-2p8q","RHSA-2021:2472","UBUNTU-CVE-2021-22901","openSUSE-SU-2024:10582-1"],"status":"published","title":"curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed...","description":"curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed memory being used when a TLS 1.3 session ticket arrives over a connection. A malicious server can use this in rare unfortunate circumstances to potentially reach remote code execution in the client. When libcurl at run-time sets up support for TLS 1.3 session tickets on a connection using OpenSSL, it stores pointers to the transfer in-memory object for later retrieval when a session ticket arrives. If the connection is used by multiple transfers (like with a reused HTTP/1.1 connection or multiplexed HTTP/2 connection) that first transfer object might be freed before the new session is established on that connection and then the function will access a memory buffer that might be freed. When using that memory, libcurl might even call a function pointer in the object, making it possible for a remote code execution if the server could somehow manage to get crafted memory content into the correct place in memory.","severity":{"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","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.63531,"percentile":0.99218,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-416"],"published":"2021-05-26T06:00:00Z","modified":"2026-10-25T01:04:44Z","fixes":[{"ecosystem":"Alpine:v3.12","package":"curl","fixed_in":["7.77.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.13","package":"curl","fixed_in":["7.77.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.14","package":"curl","fixed_in":["7.77.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.15","package":"curl","fixed_in":["7.77.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.16","package":"curl","fixed_in":["7.77.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"curl","fixed_in":["7.77.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"curl","fixed_in":["7.77.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"curl","fixed_in":["7.77.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"curl","fixed_in":["7.77.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"curl","fixed_in":["7.77.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"curl","fixed_in":["7.77.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"curl","fixed_in":["7.77.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"curl","fixed_in":["7.77.0-r0"],"sources":["osv"]},{"ecosystem":"Azure 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e/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-2021-22876","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-22890","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-2021-22901","description":"curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed memory being used when a TLS 1.3 session ticket arrives over a connection. A malicious server can use this in rare unfortunate circumstances to potentially reach remote code execution in the client. When libcurl at run-time sets up support for TLS 1.3 session tickets on a connection using OpenSSL, it stores pointers to the transfer in-memory object for later retrieval when a session ticket arrives. If the connection is used by multiple transfers (like with a reused HTTP/1.1 connection or multiplexed HTTP/2 connection) that first transfer object might be freed before the new session is established on that connection and then the function will access a memory buffer that might be freed. When using that memory, libcurl might even call a function pointer in the object, making it possible for a remote code execution if the server could somehow manage to get crafted memory content into the correct place in memory.","status":"published","published":"2021-06-11T15:49:38Z","modified":"2026-10-14T10:31:25.845Z","cwes":["CWE-416"],"updated_at":"2026-11-02T14:32:58.028461Z"}],"euvd":[{"id":"EUVD-2021-10033","description":"curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed memory being used when a TLS 1.3 session ticket arrives over a connection. A malicious server can use this in rare unfortunate circumstances to potentially reach remote code execution in the client. When libcurl at run-time sets up support for TLS 1.3 session tickets on a connection using OpenSSL, it stores pointers to the transfer in-memory object for later retrieval when a session ticket arrives. If the connection is used by multiple transfers (like with a reused HTTP/1.1 connection or multiplexed HTTP/2 connection) that first transfer object might be freed before the new session is established on that connection and then the function will access a memory buffer that might be freed. When using that memory, libcurl might even call a function pointer in the object, making it possible for a remote code execution if the server could somehow manage to get crafted memory content into the correct place in memory.","status":"published","published":"2021-06-11T15:49:38Z","modified":"2026-10-14T10:31:25Z","updated_at":"2026-11-02T17:27:16.85534Z"}],"ghsa":[{"id":"GHSA-vjwf-ghhc-2p8q","title":"curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed...","description":"curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed memory being used when a TLS 1.3 session ticket arrives over a connection. A malicious server can use this in rare unfortunate circumstances to potentially reach remote code execution in the client. When libcurl at run-time sets up support for TLS 1.3 session tickets on a connection using OpenSSL, it stores pointers to the transfer in-memory object for later retrieval when a session ticket arrives. If the connection is used by multiple transfers (like with a reused HTTP/1.1 connection or multiplexed HTTP/2 connection) that first transfer object might be freed before the new session is established on that connection and then the function will access a memory buffer that might be freed. When using that memory, libcurl might even call a function pointer in the object, making it possible for a remote code execution if the server could somehow manage to get crafted memory content into the correct place in memory.","status":"published","published":"2022-05-24T19:05:02Z","modified":"2026-10-14T12:32:26Z","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"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T15:13:24.812204Z"}],"nvd":[{"id":"CVE-2021-22901","description":"curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed memory being used when a TLS 1.3 session ticket arrives over a connection. A malicious server can use this in rare unfortunate circumstances to potentially reach remote code execution in the client. When libcurl at run-time sets up support for TLS 1.3 session tickets on a connection using OpenSSL, it stores pointers to the transfer in-memory object for later retrieval when a session ticket arrives. If the connection is used by multiple transfers (like with a reused HTTP/1.1 connection or multiplexed HTTP/2 connection) that first transfer object might be freed before the new session is established on that connection and then the function will access a memory buffer that might be freed. When using that memory, libcurl might even call a function pointer in the object, making it possible for a remote code execution if the server could somehow manage to get crafted memory content into the correct place in memory.","status":"published","published":"2021-06-11T16:15:11.12Z","modified":"2026-10-14T11:16:53.157Z","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","assessor":"primary"},{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:06:54.439974Z"}],"osv":[{"id":"ALPINE-CVE-2021-22901","description":"curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed memory being used when a TLS 1.3 session ticket arrives over a connection. A malicious server can use this in rare unfortunate circumstances to potentially reach remote code execution in the client. When libcurl at run-time sets up support for TLS 1.3 session tickets on a connection using OpenSSL, it stores pointers to the transfer in-memory object for later retrieval when a session ticket arrives. If the connection is used by multiple transfers (like with a reused HTTP/1.1 connection or multiplexed HTTP/2 connection) that first transfer object might be freed before the new session is established on that connection and then the function will access a memory buffer that might be freed. When using that memory, libcurl might even call a function pointer in the object, making it possible for a remote code execution if the server could somehow manage to get crafted memory content into the correct place in memory.","status":"published","published":"2021-06-11T16:15:11.12Z","modified":"2026-10-23T17:17:56.152122884Z","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":"2026-11-02T15:27:48.646074Z"},{"id":"AZL-6360","title":"CVE-2021-22901 affecting package curl for versions less than 7.76.0-5","description":"curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed memory being used when a TLS 1.3 session ticket arrives over a connection. A malicious server can use this in rare unfortunate circumstances to potentially reach remote code execution in the client. When libcurl at run-time sets up support for TLS 1.3 session tickets on a connection using OpenSSL, it stores pointers to the transfer in-memory object for later retrieval when a session ticket arrives. If the connection is used by multiple transfers (like with a reused HTTP/1.1 connection or multiplexed HTTP/2 connection) that first transfer object might be freed before the new session is established on that connection and then the function will access a memory buffer that might be freed. When using that memory, libcurl might even call a function pointer in the object, making it possible for a remote code execution if the server could somehow manage to get crafted memory content into the correct place in memory.","status":"published","published":"2021-06-11T16:15:11Z","modified":"2026-04-21T04:32:10.665047Z","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":"2026-11-02T15:28:07.805289Z"},{"id":"BELL-CVE-2021-22901","title":"CVE-2021-22901 does not affect BellSoft software","status":"withdrawn","published":"2023-08-31T12:15:04.581826Z","modified":"2026-01-26T09:49:18.668326Z","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":"2026-11-02T15:28:15.925958Z"},{"id":"CVE-2021-22901","description":"curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed memory being used when a TLS 1.3 session ticket arrives over a connection. A malicious server can use this in rare unfortunate circumstances to potentially reach remote code execution in the client. When libcurl at run-time sets up support for TLS 1.3 session tickets on a connection using OpenSSL, it stores pointers to the transfer in-memory object for later retrieval when a session ticket arrives. If the connection is used by multiple transfers (like with a reused HTTP/1.1 connection or multiplexed HTTP/2 connection) that first transfer object might be freed before the new session is established on that connection and then the function will access a memory buffer that might be freed. When using that memory, libcurl might even call a function pointer in the object, making it possible for a remote code execution if the server could somehow manage to get crafted memory content into the correct place in memory.","status":"published","published":"2021-06-11T16:15:11.12Z","modified":"2026-10-24T14:25:08.572579491Z","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":"2026-11-02T15:44:18.367807Z"},{"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-2021-22901","description":"curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed memory being used when a TLS 1.3 session ticket arrives over a connection. A malicious server can use this in rare unfortunate circumstances to potentially reach remote code execution in the client. When libcurl at run-time sets up support for TLS 1.3 session tickets on a connection using OpenSSL, it stores pointers to the transfer in-memory object for later retrieval when a session ticket arrives. If the connection is used by multiple transfers (like with a reused HTTP/1.1 connection or multiplexed HTTP/2 connection) that first transfer object might be freed before the new session is established on that connection and then the function will access a memory buffer that might be freed. When using that memory, libcurl might even call a function pointer in the object, making it possible for a remote code execution if the server could somehow manage to get crafted memory content into the correct place in memory.","status":"withdrawn","published":"2021-05-26T06:00:00Z","modified":"2025-07-16T08:15:31.75945Z","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":"2026-11-02T15:54:26.29421Z"},{"id":"CURL-CVE-2021-22901","title":"TLS session caching disaster","description":"libcurl can be tricked into using already freed memory when a new TLS session\nis negotiated or a client certificate is requested on an existing connection.\nFor example, this can happen when a TLS server requests a client certificate\non a connection that was established without one. A malicious server can use\nthis in rare unfortunate circumstances to potentially reach remote code\nexecution in the client.\n\nOpenSSL can declare a \"new session\" for different reasons, including the\ninitial TLS handshake completion, TLS 1.2 (or earlier) renegotiation, or TLS\n1.3 client certificate requests. When libcurl at runtime sets up support for\nsession ID caching on a connection using OpenSSL, it stores pointers to the\ntransfer in-memory object for later retrieval when OpenSSL considers a new\nsession to be established.\n\nHowever, if the connection is used by multiple transfers (like with a reused\nHTTP/1.1 connection or multiplexed HTTP/2 connection) that first transfer\nobject might be freed before the new session is established on that connection\nand then the function accesses a memory buffer that might be freed. When using\nthat memory, libcurl might even call a function pointer in the object, making\nit possible for a remote code execution if the server could somehow manage to\nget crafted memory content into the correct place in memory.","status":"published","published":"2021-05-26T08:00:00Z","modified":"2026-10-25T01:04:44.135970851Z","updated_at":"2026-11-02T15:43:55.669514Z"},{"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"}]}}