CVE-2021-22925

curl supports the `-t` command line option, known as `CURLOPT_TELNETOPTIONS`in libcurl. This rarely used option is used to send variable=content pairs toTELNET servers.Due to flaw in the option parser for sending `NEW_ENV` variables, libcurlcould be made to pass on uninitialized data from a stack based buffer to theserver. Therefore potentially revealing sensitive internal information to theserver using a clear-text network protocol.This could happen because curl did not call and use sscanf() correctly whenparsing the string provided by the application.

• CWE-200
• CWE-908

• http://seclists.org/fulldisclosure/2021/Sep/39Mailing List, Third Party Advisory
• http://seclists.org/fulldisclosure/2021/Sep/40Mailing List, Third Party Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfPatch, Third Party Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdfThird Party Advisory
• https://hackerone.com/reports/1223882Exploit, Issue Tracking, Patch, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FRUCW2UVNYUDZF72DQLFQR4PJEC6CF7V/Mailing List, Third Party Advisory
• https://security.gentoo.org/glsa/202212-01Third Party Advisory
• https://security.netapp.com/advisory/ntap-20210902-0003/Third Party Advisory
• https://support.apple.com/kb/HT212804Third Party Advisory
• https://support.apple.com/kb/HT212805Third Party Advisory
• https://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory
• https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
• http://seclists.org/fulldisclosure/2021/Sep/39Mailing List, Third Party Advisory
• http://seclists.org/fulldisclosure/2021/Sep/40Mailing List, Third Party Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfPatch, Third Party Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdfThird Party Advisory
• https://hackerone.com/reports/1223882Exploit, Issue Tracking, Patch, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FRUCW2UVNYUDZF72DQLFQR4PJEC6CF7V/Mailing List, Third Party Advisory
• https://security.gentoo.org/glsa/202212-01Third Party Advisory
• https://security.netapp.com/advisory/ntap-20210902-0003/Third Party Advisory
• https://support.apple.com/kb/HT212804Third Party Advisory
• https://support.apple.com/kb/HT212805Third Party Advisory
• https://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory
• https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory

Published

Aug 5, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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