{"id":"CVE-2021-22890","revision":"1116400a34964a2ca02a91675767a2ae","records":[{"revision":"1116400a34964a2ca02a91675767a2ae","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2021-22890","aliases":[],"title":"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 ar…","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.","state":0,"publishedAt":"2021-04-01T17:46:17+00:00","modifiedAt":"2026-10-14T10:15:43.043+00:00","affected":[{"ecosystem":"Vendor product","name":"https://github.com/curl/curl","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"https://github.com/curl/curl\",\n                    \"vendor\": \"n/a\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"7.63.0 to and including 7.75.0\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://hackerone.com/reports/1129529","https://curl.se/docs/CVE-2021-22890.html","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITVWPVGLFISU5BJC2BXBRYSDXTXE2YGC/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KQUIOYX2KUU6FIUZVB5WWZ6JHSSYSQWJ/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2ZC5BMIOKLBQJSFCHEDN2G2C2SH274BP/","https://security.gentoo.org/glsa/202105-36","https://www.oracle.com//security-alerts/cpujul2021.html","https://security.netapp.com/advisory/ntap-20210521-0007/","https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2021-22890","license":"CVE Program Terms of Use","key":"cve-program:CVE-2021-22890","identifiers":["CVE-2021-22890"]},"retained":false,"historicalAffected":[]}],"coverage":[]}