{"id":"CVE-2011-1431","aliases":["EUVD-2011-1436","GHSA-c4mq-4wp5-9pxq"],"status":"published","title":"The STARTTLS implementation in qmail-smtpd.c in qmail-smtpd in the netqmail-1.06-tls patch for...","description":"The STARTTLS implementation in qmail-smtpd.c in qmail-smtpd in the netqmail-1.06-tls patch for netqmail 1.06 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":0.04593,"percentile":0.9171,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2011-03-16T22:00:00Z","modified":"2026-06-16T23:29:20Z","products":[{"vendor":"frederik_vermeulen","product":"netqmail"}],"references":[{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/65932","tags":["vdb-entry","x_refsource_XF","x_transferred"]},{"url":"http://www.kb.cert.org/vuls/id/MAPG-8D9M5Q","tags":["x_refsource_MISC","x_transferred","US Government Resource"]},{"url":"http://inoa.net/qmail-tls/vu555316.patch","tags":["x_refsource_CONFIRM","x_transferred","Patch"]},{"url":"http://www.postfix.org/CVE-2011-0411.html","tags":["x_refsource_MISC","x_transferred","Exploit","Vendor Advisory"]},{"url":"http://www.vupen.com/english/advisories/2011/0612","tags":["vdb-entry","x_refsource_VUPEN","x_transferred","Vendor Advisory"]},{"url":"http://www.securityfocus.com/bid/46767","tags":["vdb-entry","x_refsource_BID","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":"http://www.securityfocus.com/archive/1/516901","tags":["mailing-list","x_refsource_BUGTRAQ","x_transferred","Exploit"]},{"url":"http://securityreason.com/securityalert/8144","tags":["third-party-advisory","x_refsource_SREASON","x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2011-1431"},{"url":"https://github.com/advisories/GHSA-c4mq-4wp5-9pxq"}],"sources":{"cve":[{"id":"CVE-2011-1431","description":"The STARTTLS implementation in qmail-smtpd.c in qmail-smtpd in the netqmail-1.06-tls patch for netqmail 1.06 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":"2011-03-16T22:00:00Z","modified":"2024-08-06T22:28:40.837Z","updated_at":"2026-11-02T14:35:38.711857Z"}],"euvd":[{"id":"EUVD-2011-1436","description":"The STARTTLS implementation in qmail-smtpd.c in qmail-smtpd in the netqmail-1.06-tls patch for netqmail 1.06 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":"2011-03-16T22:00:00Z","modified":"2024-08-06T22:28:40Z","updated_at":"2026-11-03T01:55:56.688775Z"}],"ghsa":[{"id":"GHSA-c4mq-4wp5-9pxq","title":"The STARTTLS implementation in qmail-smtpd.c in qmail-smtpd in the netqmail-1.06-tls patch for...","description":"The STARTTLS implementation in qmail-smtpd.c in qmail-smtpd in the netqmail-1.06-tls patch for netqmail 1.06 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":"2022-05-17T02:00:34Z","modified":"2023-02-03T05:06:39Z","updated_at":"2026-11-02T14:53:55.946665Z"}],"nvd":[{"id":"CVE-2011-1431","description":"The STARTTLS implementation in qmail-smtpd.c in qmail-smtpd in the netqmail-1.06-tls patch for netqmail 1.06 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":"2011-03-16T22:55:04.933Z","modified":"2026-06-16T23:29:20.17Z","cvss":[{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:02:07.221228Z"}]}}