{"id":"CVE-2021-22925","title":"curl supports the `-t` command line option, known as `CURLOPT_TELNETOPTIONS`in libcurl","summary":"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, lib…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","cwe":["CWE-200","CWE-908"],"vendor":"haxx","product":"curl","affected":["curl >= 7.7, < 7.78.0","fedora = 33","cloud_backup","clustered_data_ontap","hci_management_node","solidfire","mac_os_x = 10.15.7","macos = 11.0","macos = 11.0.1","macos = 11.1","macos = 11.1.0","macos = 11.2","macos = 11.2.1","macos = 11.3","macos = 11.3.1","macos = 11.4","macos = 11.5","mysql_server >= 5.7.0, <= 5.7.35","mysql_server >= 8.0.0, <= 8.0.26","peoplesoft_enterprise_peopletools = 8.57","peoplesoft_enterprise_peopletools = 8.58","peoplesoft_enterprise_peopletools = 8.59","sinec_infrastructure_network_services < 1.0.1.1","sinema_remote_connect_server < 3.1","h300s_firmware","h500s_firmware","h700s_firmware","h300e_firmware","h500e_firmware","h700e_firmware","h410s_firmware","universal_forwarder >= 8.2.0, < 8.2.12","universal_forwarder >= 9.0.0, < 9.0.6","universal_forwarder = 9.1.0"],"patched":["curl 7.78.0","sinec_infrastructure_network_services 1.0.1.1","sinema_remote_connect_server 3.1","universal_forwarder 9.0.6"],"published":"2021-08-05","updated":"2026-10-14","sourceUpdated":"2026-10-14T11:16:54.113","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-22925","references":[{"url":"http://seclists.org/fulldisclosure/2021/Sep/39","label":"support@hackerone.com"},{"url":"http://seclists.org/fulldisclosure/2021/Sep/40","label":"support@hackerone.com"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf","label":"support@hackerone.com"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf","label":"support@hackerone.com"},{"url":"https://hackerone.com/reports/1223882","label":"support@hackerone.com"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FRUCW2UVNYUDZF72DQLFQR4PJEC6CF7V/","label":"support@hackerone.com"},{"url":"https://security.gentoo.org/glsa/202212-01","label":"support@hackerone.com"},{"url":"https://security.netapp.com/advisory/ntap-20210902-0003/","label":"support@hackerone.com"},{"url":"https://support.apple.com/kb/HT212804","label":"support@hackerone.com"},{"url":"https://support.apple.com/kb/HT212805","label":"support@hackerone.com"},{"url":"https://www.oracle.com/security-alerts/cpujan2022.html","label":"support@hackerone.com"},{"url":"https://www.oracle.com/security-alerts/cpuoct2021.html","label":"support@hackerone.com"},{"url":"http://seclists.org/fulldisclosure/2021/Sep/39","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://seclists.org/fulldisclosure/2021/Sep/40","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://hackerone.com/reports/1223882","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FRUCW2UVNYUDZF72DQLFQR4PJEC6CF7V/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/202212-01","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20210902-0003/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://support.apple.com/kb/HT212804","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://support.apple.com/kb/HT212805","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/security-alerts/cpujan2022.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/security-alerts/cpuoct2021.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-389290.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-398330.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-484086.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd"],"epss":0.04929,"epssPercentile":0.91953,"ingestedAt":"2026-10-14T11:27:22.126Z","slug":"CVE-2021-22925","body":"## Overview\n\ncurl 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.\n\n## Affected\n\n- `curl >= 7.7, < 7.78.0`\n- `fedora = 33`\n- `cloud_backup`\n- `clustered_data_ontap`\n- `hci_management_node`\n- `solidfire`\n- `mac_os_x = 10.15.7`\n- `macos = 11.0`\n- `macos = 11.0.1`\n- `macos = 11.1`\n- `macos = 11.1.0`\n- `macos = 11.2`\n- `macos = 11.2.1`\n- `macos = 11.3`\n- `macos = 11.3.1`\n- `macos = 11.4`\n- `macos = 11.5`\n- `mysql_server >= 5.7.0, <= 5.7.35`\n- `mysql_server >= 8.0.0, <= 8.0.26`\n- `peoplesoft_enterprise_peopletools = 8.57`\n- `peoplesoft_enterprise_peopletools = 8.58`\n- `peoplesoft_enterprise_peopletools = 8.59`\n- `sinec_infrastructure_network_services < 1.0.1.1`\n- `sinema_remote_connect_server < 3.1`\n- `h300s_firmware`\n- `h500s_firmware`\n- `h700s_firmware`\n- `h300e_firmware`\n- `h500e_firmware`\n- `h700e_firmware`\n- `h410s_firmware`\n- `universal_forwarder >= 8.2.0, < 8.2.12`\n- `universal_forwarder >= 9.0.0, < 9.0.6`\n- `universal_forwarder = 9.1.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `curl 7.78.0`\n- `sinec_infrastructure_network_services 1.0.1.1`\n- `sinema_remote_connect_server 3.1`\n- `universal_forwarder 9.0.6`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":29.2,"likelihood":1,"exploitation":0,"ransomware":0},"changes":[]}