Unrated severityNVD Advisory· Published May 23, 2011· Updated Jun 16, 2026
CVE-2011-2165
CVE-2011-2165
Description
The STARTTLS implementation in WatchGuard XCS 9.0 and 9.1 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.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
3cpe:2.3:a:watchguard:xcs:9.0:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:watchguard:xcs:9.0:*:*:*:*:*:*:*
- cpe:2.3:a:watchguard:xcs:9.1:*:*:*:*:*:*:*
- (no CPE)range: 9.0, 9.1
Patches
Vulnerability mechanics
References
5- www.kb.cert.org/vuls/id/555316nvdUS Government Resource
- www.kb.cert.org/vuls/id/MAPG-8D9M75nvdUS Government Resource
- secunia.com/advisories/44753nvd
- www.watchguard.com/support/release-notes/xcs/9/en-US/EN_ReleaseNotes_XCS_9_1_1/EN_ReleaseNotes_WG_XCS_9_1_TLS_Hotfix.pdfnvd
- exchange.xforce.ibmcloud.com/vulnerabilities/67729nvd
News mentions
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