{"id":"CVE-2021-22946","state":"PUBLISHED","title":"A user can tell curl >= 7.20.0 and <= 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_SS","description":"A user can tell curl >= 7.20.0 and <= 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.","publishedAt":"2021-09-29T00:00:00.000Z","updatedAt":"2026-10-14T11:29:20.323Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","source":"CISA-ADP"},"assigner":"hackerone","products":["n/a https://github.com/curl/curl"],"affected":[{"vendor":"n/a","product":"https://github.com/curl/curl","versions":[{"version":"curl 7.20.0 to and including 7.78.0","status":"affected"}]}],"references":["https://hackerone.com/reports/1334111","https://lists.debian.org/debian-lts-announce/2021/09/msg00022.html","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RWLEC6YVEM2HWUBX67SDGPSY4CQB72OE/","https://www.oracle.com/security-alerts/cpuoct2021.html","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APOAK4X73EJTAPTSVT7IRVDMUWVXNWGD/","https://www.oracle.com/security-alerts/cpujan2022.html","https://security.netapp.com/advisory/ntap-20211029-0003/","https://security.netapp.com/advisory/ntap-20220121-0008/","http://seclists.org/fulldisclosure/2022/Mar/29","https://www.oracle.com/security-alerts/cpuapr2022.html","https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf","https://support.apple.com/kb/HT213183","https://www.oracle.com/security-alerts/cpujul2022.html","https://www.debian.org/security/2022/dsa-5197","https://lists.debian.org/debian-lts-announce/2022/08/msg00017.html","https://security.gentoo.org/glsa/202212-01","https://cert-portal.siemens.com/productcert/html/ssa-389290.html","https://cert-portal.siemens.com/productcert/html/ssa-146325.html","https://cert-portal.siemens.com/productcert/html/ssa-398330.html"],"weaknesses":["CWE-325","CWE-319"],"ingestedAt":"2026-10-29T19:48:02.192Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/22xxx/CVE-2021-22946.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-22946","state":"PUBLISHED","datePublished":"2021-09-29T00:00:00.000Z","dateUpdated":"2026-10-14T11:29:20.323Z","assignerShortName":"hackerone","assignerOrgId":"36234546-b8fa-4601-9d6f-f4e334aa8ea1","dateReserved":"2021-01-06T00:00:00.000Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"A user can tell curl >= 7.20.0 and <= 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). 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