CVE-2011-0411

Severity: medium (CVSS 6.8 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 16.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2011-03-16 · updated 2026-06-16
Weakness: CWE-264

Description

The STARTTLS implementation in Postfix 2.4.x before 2.4.16, 2.5.x before 2.5.12, 2.6.x before 2.6.9, and 2.7.x before 2.7.3 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.

Affected products

Postfix: 2.4, 2.4.0, 2.4.1, 2.4.2, 2.4.3, 2.4.4 (+36)

References

http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10705
http://lists.apple.com/archives/Security-announce/2011//Oct/msg00003.html
http://lists.fedoraproject.org/pipermail/package-announce/2011-March/056559.html
http://lists.fedoraproject.org/pipermail/package-announce/2011-March/056560.html
http://lists.opensuse.org/opensuse-security-announce/2011-05/msg00005.html
http://secunia.com/advisories/43646
http://secunia.com/advisories/43874
http://security.gentoo.org/glsa/glsa-201206-33.xml
http://securitytracker.com/id?1025179
http://support.apple.com/kb/HT5002
http://www.debian.org/security/2011/dsa-2233
http://www.kb.cert.org/vuls/id/555316

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