{"id":"CVE-2021-22898","revision":null,"records":[{"revision":"deca8ce5ab8d4549bc2a6eed4e636403","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2021-22898","aliases":[],"title":"curl 7.7 through 7.76.1 suffers from an information disclosure when the `-t` command line option, known as `CURLOPT_TELNETOPTIONS` in libcurl, is used to send variable=content pairs to TELNET servers. Due to a flaw in the option parser for …","description":"curl 7.7 through 7.76.1 suffers from an information disclosure when the `-t` command line option, known as `CURLOPT_TELNETOPTIONS` in libcurl, is used to send variable=content pairs to TELNET servers. Due to a flaw in the option parser for sending NEW_ENV variables, libcurl could be made to pass on uninitialized data from a stack based buffer to the server, resulting in potentially revealing sensitive internal information to the server using a clear-text network protocol.","state":0,"publishedAt":"2021-06-11T15:49:37+00:00","modifiedAt":"2026-10-14T10:21:16.555+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\": \"7.7 through 7.76.1\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://hackerone.com/reports/1176461","https://curl.se/docs/CVE-2021-22898.html","https://github.com/curl/curl/commit/39ce47f219b09c380b81f89fe54ac586c8db6bde","https://lists.apache.org/thread.html/rc713534b10f9daeee2e0990239fa407e2118e4aa9e88a7041177497c%40%3Cissues.guacamole.apache.org%3E","https://www.oracle.com//security-alerts/cpujul2021.html","http://www.openwall.com/lists/oss-security/2021/07/21/4","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/POOC3UV7V6L4CJ5KA2PTWTNUV5Y72T3Q/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FRUCW2UVNYUDZF72DQLFQR4PJEC6CF7V/","https://lists.debian.org/debian-lts-announce/2021/08/msg00017.html","https://www.oracle.com/security-alerts/cpujan2022.html","https://www.oracle.com/security-alerts/cpuapr2022.html","https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf","https://www.debian.org/security/2022/dsa-5197","https://lists.debian.org/debian-lts-announce/2022/08/msg00017.html"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2021-22898","license":"CVE Program Terms of Use","key":"cve-program:CVE-2021-22898","identifiers":["CVE-2021-22898"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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