CVE-2011-0411
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.
Key facts
- CVSS score
- 6.8 (v2.0)
- Severity
- MEDIUM
- CVSS vector
AV:N/AC:M/Au:N/C:P/I:P/A:P- Weakness (CWE)
- CWE-264
- EPSS score
- 16.3% (97th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2011-0437)
- Published
- March 16, 2011
- NVD last modified
- June 16, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2011-0437 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.
View on the EU Vulnerability DatabaseAffected products
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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(Vendor Advisory)
- 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(US Government Resource)
- http://www.kb.cert.org/vuls/id/MORO-8ELH6Z(US Government Resource)
- http://www.openwall.com/lists/oss-security/2021/08/10/2
- http://www.oracle.com/technetwork/topics/security/cpuapr2011-301950.html
- http://www.osvdb.org/71021
- http://www.postfix.org/CVE-2011-0411.html(Exploit, Vendor Advisory)
- http://www.redhat.com/support/errata/RHSA-2011-0422.html
- http://www.redhat.com/support/errata/RHSA-2011-0423.html
- http://www.securityfocus.com/bid/46767
- http://www.vupen.com/english/advisories/2011/0611(Vendor Advisory)
- http://www.vupen.com/english/advisories/2011/0752
- http://www.vupen.com/english/advisories/2011/0891
- https://exchange.xforce.ibmcloud.com/vulnerabilities/65932
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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