{"id":"CVE-2011-2165","aliases":["EUVD-2011-2157","GHSA-7445-q6fm-5g46"],"status":"published","title":"The STARTTLS implementation in WatchGuard XCS 9.0 and 9.1 does not properly restrict I/O...","description":"The STARTTLS implementation in WatchGuard XCS 9.0 and 9.1 does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted SMTP sessions by sending a cleartext command that is processed after TLS is in place, related to a \"plaintext command injection\" attack, a similar issue to CVE-2011-0411.","severity":{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.05156,"percentile":0.92484,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-264"],"published":"2011-05-23T22:00:00Z","modified":"2026-06-16T23:30:50Z","exploits":[{"source":"exploitdb","id":"EDB-37440","title":"Watchguard XCS 10.0 - Multiple Vulnerabilities","type":"webapps","platform":"php","date":"2015-06-30","url":"https://www.exploit-db.com/exploits/37440"}],"products":[{"vendor":"watchguard","product":"xcs"}],"references":[{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/67729","tags":["vdb-entry","x_refsource_XF","x_transferred"]},{"url":"http://secunia.com/advisories/44753","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred"]},{"url":"http://www.kb.cert.org/vuls/id/MAPG-8D9M75","tags":["x_refsource_CONFIRM","x_transferred","US Government Resource"]},{"url":"http://www.watchguard.com/support/release-notes/xcs/9/en-US/EN_ReleaseNotes_XCS_9_1_1/EN_ReleaseNotes_WG_XCS_9_1_TLS_Hotfix.pdf","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"http://www.kb.cert.org/vuls/id/555316","tags":["third-party-advisory","x_refsource_CERT-VN","x_transferred","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2011-2165"},{"url":"https://github.com/advisories/GHSA-7445-q6fm-5g46"}],"sources":{"cve":[{"id":"CVE-2011-2165","description":"The STARTTLS implementation in WatchGuard XCS 9.0 and 9.1 does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted SMTP sessions by sending a cleartext command that is processed after TLS is in place, related to a \"plaintext command injection\" attack, a similar issue to CVE-2011-0411.","status":"published","published":"2011-05-23T22:00:00Z","modified":"2024-08-06T22:53:17.429Z","updated_at":"2026-11-02T14:35:36.603688Z"}],"euvd":[{"id":"EUVD-2011-2157","description":"The STARTTLS implementation in WatchGuard XCS 9.0 and 9.1 does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted SMTP sessions by sending a cleartext command that is processed after TLS is in place, related to a \"plaintext command injection\" attack, a similar issue to CVE-2011-0411.","status":"published","published":"2011-05-23T22:00:00Z","modified":"2024-08-06T22:53:17Z","updated_at":"2026-11-03T01:55:53.609033Z"}],"ghsa":[{"id":"GHSA-7445-q6fm-5g46","title":"The STARTTLS implementation in WatchGuard XCS 9.0 and 9.1 does not properly restrict I/O...","description":"The STARTTLS implementation in WatchGuard XCS 9.0 and 9.1 does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted SMTP sessions by sending a cleartext command that is processed after TLS is in place, related to a \"plaintext command injection\" attack, a similar issue to CVE-2011-0411.","status":"published","published":"2022-05-17T01:55:22Z","modified":"2023-02-03T05:06:11Z","updated_at":"2026-11-02T14:53:51.728884Z"}],"nvd":[{"id":"CVE-2011-2165","description":"The STARTTLS implementation in WatchGuard XCS 9.0 and 9.1 does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted SMTP sessions by sending a cleartext command that is processed after TLS is in place, related to a \"plaintext command injection\" attack, a similar issue to CVE-2011-0411.","status":"published","published":"2011-05-23T22:55:01.553Z","modified":"2026-06-16T23:30:50.437Z","cvss":[{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-264"],"updated_at":"2026-11-02T14:02:08.47516Z"}]}}