CVE-2011-2165
MEDIUM · CVSS 6.8EPSS 5.2%EU EUVD
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.
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
- 5.2% (92th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2011-2157)
- Published
- May 23, 2011
- NVD last modified
- June 16, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2011-2157 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.
View on the EU Vulnerability DatabaseAffected products
- watchguard / xcs
- watchguard / xcs
References
- 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_Hotfix.pdf
- https://exchange.xforce.ibmcloud.com/vulnerabilities/67729
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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