CVE-2011-1431

Name: CVE-2011-1431
Creator: NVD / NIST
Published: 2011-03-16T22:55:04.933+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 4.59%

Last modified Jun 16, 2026

CVE-2011-1431 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 4.59% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

4.59%

90.4th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Frederik Vermeulen	Netqmail	1.06

References

http://inoa.net/qmail-tls/vu555316.patchPatch
http://securityreason.com/securityalert/8144
http://www.kb.cert.org/vuls/id/555316US Government Resource
http://www.kb.cert.org/vuls/id/MAPG-8D9M5QUS Government Resource
http://www.postfix.org/CVE-2011-0411.htmlExploit, Vendor Advisory
http://www.securityfocus.com/archive/1/516901Exploit
http://www.securityfocus.com/bid/46767
http://www.vupen.com/english/advisories/2011/0612Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/65932
http://inoa.net/qmail-tls/vu555316.patchPatch
http://securityreason.com/securityalert/8144
http://www.kb.cert.org/vuls/id/555316US Government Resource
http://www.kb.cert.org/vuls/id/MAPG-8D9M5QUS Government Resource
http://www.postfix.org/CVE-2011-0411.htmlExploit, Vendor Advisory
http://www.securityfocus.com/archive/1/516901Exploit
http://www.securityfocus.com/bid/46767
http://www.vupen.com/english/advisories/2011/0612Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/65932

Timeline

Published: Mar 16, 2011
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2011-1431?

How severe is CVE-2011-1431?

Severity scoring for CVE-2011-1431 is pending analysis. The EPSS model estimates a 4.59% probability of exploitation in the next 30 days.

How do I fix CVE-2011-1431?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2011-1431?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST