Unrated severityNVD Advisory· Published Mar 16, 2011· Updated Jun 16, 2026
CVE-2011-1431
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2- cpe:2.3:a:frederik_vermeulen:netqmail:1.06:*:*:*:*:*:*:*
- Range: = 1.06 (netqmail-1.06-tls patch)
Patches
Vulnerability mechanics
References
9- inoa.net/qmail-tls/vu555316.patchnvdPatch
- www.postfix.org/CVE-2011-0411.htmlnvdExploitVendor Advisory
- www.securityfocus.com/archive/1/516901nvdExploit
- www.vupen.com/english/advisories/2011/0612nvdVendor Advisory
- www.kb.cert.org/vuls/id/555316nvdUS Government Resource
- www.kb.cert.org/vuls/id/MAPG-8D9M5QnvdUS Government Resource
- securityreason.com/securityalert/8144nvd
- www.securityfocus.com/bid/46767nvd
- exchange.xforce.ibmcloud.com/vulnerabilities/65932nvd
News mentions
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