{"id":"CVE-2021-22945","aliases":["ALPINE-CVE-2021-22945","AZL-6368","BELL-CVE-2021-22945","CURL-CVE-2021-22945","DEBIAN-CVE-2021-22945","DSA-5197-1","EUVD-2021-10073","GHSA-22mx-9r92-42g8","JLSEC-2025-29","MGASA-2021-0438","OESA-2021-1382","UBUNTU-CVE-2021-22945","USN-5079-1","openSUSE-SU-2024:10582-1"],"status":"published","title":"When sending data to an MQTT server, libcurl \u003c= 7.73.0 and 7.78.0 could in some circumstances...","description":"When sending data to an MQTT server, libcurl \u003c= 7.73.0 and 7.78.0 could in some circumstances erroneously keep a pointer to an already freed memory area and both use that again in a subsequent call to send data and also free it 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an MQTT server, libcurl \u003c= 7.73.0 and 7.78.0 could in some circumstances erroneously keep a pointer to an already freed memory area and both use that again in a subsequent call to send data and also free it *again*.","status":"published","published":"2021-09-23T13:15:08.69Z","modified":"2026-10-14T12:17:08.693Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"critical","assessor":"primary"},{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"critical","assessor":"secondary"},{"version":"2.0","score":5.8,"vector":"AV:N/AC:M/Au:N/C:P/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-415"],"updated_at":"2026-11-02T14:06:58.933037Z"}],"osv":[{"id":"ALPINE-CVE-2021-22945","description":"When sending data to an MQTT server, libcurl \u003c= 7.73.0 and 7.78.0 could in some circumstances erroneously keep a pointer to an already freed memory area and both use that again in a subsequent call to send data and also free it *again*.","status":"published","published":"2021-09-23T13:15:08.69Z","modified":"2026-10-23T17:17:56.154189771Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"critical"}],"updated_at":"2026-11-02T15:27:48.646074Z"},{"id":"AZL-6368","title":"CVE-2021-22945 affecting package curl for versions less than 7.82.0-1","description":"When sending data to an MQTT server, libcurl \u003c= 7.73.0 and 7.78.0 could in some circumstances erroneously keep a pointer to an already freed memory area and both use that again in a subsequent call to send data and also free it *again*.","status":"published","published":"2021-09-23T13:15:08Z","modified":"2026-04-21T04:32:11.462401Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"critical"}],"updated_at":"2026-11-02T15:28:07.805289Z"},{"id":"BELL-CVE-2021-22945","title":"CVE-2021-22945 does not affect BellSoft software","status":"withdrawn","published":"2023-08-31T12:14:12.393783Z","modified":"2026-01-26T09:47:59.271446Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"critical"}],"updated_at":"2026-11-02T15:28:15.925958Z"},{"id":"CVE-2021-22945","description":"When sending data to an MQTT server, libcurl \u003c= 7.73.0 and 7.78.0 could in some circumstances erroneously keep a pointer to an already freed memory area and both use that again in a subsequent call to send data and also free it *again*.","status":"published","published":"2021-09-23T13:15:08.69Z","modified":"2026-10-24T10:30:47.416917569Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"critical"}],"updated_at":"2026-11-02T15:44:18.367807Z"},{"id":"DEBIAN-CVE-2021-22945","description":"When sending data to an MQTT server, libcurl \u003c= 7.73.0 and 7.78.0 could in some circumstances erroneously keep a pointer to an already freed memory area and both use that again in a subsequent call to send data and also free it *again*.","status":"published","published":"2021-09-23T13:15:08.69Z","modified":"2026-10-15T09:47:29.621437935Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"critical"}],"updated_at":"2026-11-02T15:45:34.637046Z"},{"id":"JLSEC-2025-29","title":"When sending data to an MQTT server, libcurl \u003c= 7.73.0 and 7.78.0 could in some circumstances...","description":"When sending data to an MQTT server, libcurl \u003c= 7.73.0 and 7.78.0 could in some circumstances erroneously keep a pointer to an already freed memory area and both use that again in a subsequent call to send data and also free it *again*.","status":"published","published":"2025-10-10T15:04:01.319Z","modified":"2026-07-25T18:23:38.969598851Z","cvss":[{"version":"2.0","score":5.8,"vector":"AV:N/AC:M/Au:N/C:P/I:N/A:P","level":"medium"},{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"critical"}],"updated_at":"2026-11-02T15:47:17.805107Z"},{"id":"OESA-2021-1382","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\nWhen curl \u0026gt;= 7.20.0 and \u0026lt;= 7.78.0 connects to an IMAP or POP3 server to retrieve data using STARTTLS to upgrade to TLS security, the server can respond and send back multiple responses at once that curl caches. curl would then upgrade to TLS but not flush the in-queue of cached responses but instead continue using and trustingthe responses it got *before* the TLS handshake as if they were authenticated.Using this flaw, it allows a Man-In-The-Middle attacker to first inject the fake responses, then pass-through the TLS traffic from the legitimate server and trick curl into sending data back to the user thinking the attacker\u0026apos;s injected data comes from the TLS-protected server.(CVE-2021-22947)\r\n\r\nA user can tell curl \u0026gt;= 7.20.0 and \u0026lt;= 7.78.0 to require a successful upgrade to TLS when speaking to an IMAP, POP3 or FTP server (`--ssl-reqd` on the command line or`CURLOPT_USE_SSL` set to `CURLUSESSL_CONTROL` or `CURLUSESSL_ALL` withlibcurl). This requirement could be bypassed if the server would return a properly crafted but perfectly legitimate response.This flaw would then make curl silently continue its operations **withoutTLS** contrary to the instructions and expectations, exposing possibly sensitive data in clear text over the network.(CVE-2021-22946)\r\n\r\nWhen sending data to an MQTT server, libcurl \u0026lt;= 7.73.0 and 7.78.0 could in some circumstances erroneously keep a pointer to an already freed memory area and both use that again in a subsequent call to send data and also free it *again*.(CVE-2021-22945)","status":"published","published":"2021-10-15T11:04:39Z","modified":"2026-08-18T01:16:03.854619515Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:52:38.987987Z"},{"id":"UBUNTU-CVE-2021-22945","description":"When sending data to an MQTT server, libcurl \u003c= 7.73.0 and 7.78.0 could in some circumstances erroneously keep a pointer to an already freed memory area and both use that again in a subsequent call to send data and also free it *again*.","status":"published","published":"2021-09-15T00:00:00Z","modified":"2026-04-22T12:48:07.896039Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"critical"},{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"critical"}],"updated_at":"2026-11-02T15:54:26.29421Z"},{"id":"CURL-CVE-2021-22945","title":"UAF and double free in MQTT sending","description":"When sending data to an MQTT server, libcurl could in some circumstances\nerroneously keep a pointer to an already freed memory area and both use that\nagain in a subsequent call to send data and also free it *again*.","status":"published","published":"2021-09-15T08:00:00Z","modified":"2026-10-25T01:04:41.716975632Z","updated_at":"2026-11-02T15:43:55.669514Z"},{"id":"DSA-5197-1","title":"curl - security update","status":"published","published":"2022-08-01T00:00:00Z","modified":"2026-03-09T02:10:41.680987Z","updated_at":"2026-11-02T15:46:17.543497Z"},{"id":"MGASA-2021-0438","title":"Updated curl packages fix security vulnerability","description":"UAF and double-free in MQTT sending. (CVE-2021-22945)\n\nProtocol downgrade required TLS bypassed. (CVE-2021-22946)\n\nSTARTTLS protocol injection via MITM. (CVE-2021-22947)\n","status":"published","published":"2021-09-23T04:49:29Z","modified":"2026-04-16T04:44:40.416463587Z","updated_at":"2026-11-02T15:49:41.849028Z"},{"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":"USN-5079-1","title":"curl vulnerabilities","description":"It was discovered that curl incorrect handled memory when sending data to\nan MQTT server. A remote attacker could use this issue to cause curl to\ncrash, resulting in a denial of service, or possibly execute arbitrary\ncode. (CVE-2021-22945)\n\nPatrick Monnerat discovered that curl incorrectly handled upgrades to TLS.\nWhen receiving certain responses from servers, curl would continue without\nTLS even when the option to require a successful upgrade to TLS was\nspecified. (CVE-2021-22946)\n\nPatrick Monnerat discovered that curl incorrectly handled responses\nreceived before STARTTLS. A remote attacker could possibly use this issue\nto inject responses and intercept communications. (CVE-2021-22947)\n","status":"published","published":"2021-09-15T11:11:13Z","modified":"2026-04-27T09:19:03.013268Z","updated_at":"2026-11-02T16:58:15.683829Z"}]}}