What’s Vulnerable › Vulnerabilities

CVE-2011-2165

• Severity: medium (CVSS 6.8 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2011-05-23 · updated 2026-06-16
• Weakness: CWE-264

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.

Affected products

• WatchGuard Xcs: 9.0, 9.1

References

• http://secunia.com/advisories/44753
• http://www.kb.cert.org/vuls/id/555316
• http://www.kb.cert.org/vuls/id/MAPG-8D9M75
• http://www.watchguard.com/support/release-notes/xcs/9/en-US/EN_ReleaseNotes_XCS_9_1_1/EN_ReleaseNotes_WG_XCS_9_1_TLS_Hotfix.pdf
• https://exchange.xforce.ibmcloud.com/vulnerabilities/67729
• http://secunia.com/advisories/44753
• http://www.kb.cert.org/vuls/id/555316
• http://www.kb.cert.org/vuls/id/MAPG-8D9M75
• http://www.watchguard.com/support/release-notes/xcs/9/en-US/EN_ReleaseNotes_XCS_9_1_1/EN_ReleaseNotes_WG_XCS_9_1_TLS_Hotfix.pdf
• https://exchange.xforce.ibmcloud.com/vulnerabilities/67729

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