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Vulnerability record · CVE-2011-2165 · published 23 May 2011

CVE-2011-2165: Watchguard xcs permissions and access controls vulnerability

Watchguard · Xcs

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.

6.8 CVSS 2.0 Medium EPSS 5.2% · top 7.9% CWE-264 · Permissions and access controls
6.8CVSS 2.0 base score
5.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References
16 Jun 2026Last modified by NVD

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.

AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://secunia.com/advisories/44753
http://www.kb.cert.org/vuls/id/555316 US Government Resource
http://www.kb.cert.org/vuls/id/MAPG-8D9M75 US Government Resource
http://www.watchguard.com/support/release-notes/xcs/9/en-US/EN_ReleaseNotes_XCS_9_1_1/EN_ReleaseNotes_WG_XCS_9_1_TLS_Hot
https://exchange.xforce.ibmcloud.com/vulnerabilities/67729
http://secunia.com/advisories/44753
http://www.kb.cert.org/vuls/id/555316 US Government Resource
http://www.kb.cert.org/vuls/id/MAPG-8D9M75 US Government Resource
http://www.watchguard.com/support/release-notes/xcs/9/en-US/EN_ReleaseNotes_XCS_9_1_1/EN_ReleaseNotes_WG_XCS_9_1_TLS_Hot
https://exchange.xforce.ibmcloud.com/vulnerabilities/67729

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2011-2165), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.