CVE-2011-2165 json
The STARTTLS implementation in WatchGuard XCS 9.0 and 9.1 does not properly restrict I/O buffering, which allows man-in-the-middle attacker…
published 2011-05-23 15 y ago modified 2026-06-16 4 mo ago also EUVD-2011-2157
- cvss
- 6.8
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 5.2%
- EPSS 5.2% chance of exploitation in 30 days, percentile 92%
- public exploits
- 1
- Exploit-DB
Summary
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.
Timeline
- Published
- First public exploit (EDB-37440)
Exploit prediction
5.16% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- EDB-37440 Watchguard XCS 10.0 - Multiple Vulnerabilities webapps, 2015-06-30
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 2.0 | 6.8 | AV:N/AC:M/Au:N/C:P/I:P/A:P |
Classification
- Weakness
-
- CWE-264 Permissions, Privileges, and Access Controls
References
-
exchange.xforce.ibmcloud.com
/vulnerabilities/67729
vdb-entry
-
secunia.com
/advisories/44753
third-party-advisory
-
kb.cert.org
/vuls/id/MAPG-8D9M75
us-government-resource
- watchguard.com /support/release-notes/xcs/9/en-US/EN_ReleaseNotes_XCS_9_1_1/EN_ReleaseNotes_WG_XCS_9_1_TLS_Hotfix.pdf
-
kb.cert.org
/vuls/id/555316
third-party-advisory, us-government-resource
Sources
- CVE List CVE-2011-2165
- NVD CVE-2011-2165
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