CVE-2011-2165
The STARTTLS implementation in WatchGuard XCS 9.0 and 9.1 does not properly restrict I/O...
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.
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2011-2165- CVSS 2.0
- 6.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:P - Weakness
- CWE-264
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2011-2165- Updated
- 2026-11-02
EUVDEUVD-2011-2157 No score
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.
- Record
EUVD-2011-2157- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-7445-q6fm-5g46 No score
The STARTTLS implementation in WatchGuard XCS 9.0 and 9.1 does not properly restrict I/O...
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.
- Record
GHSA-7445-q6fm-5g46- Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| Exploit-DB | Watchguard XCS 10.0 - Multiple Vulnerabilities | 2015-06-30 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, Exploit-DB, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2011-2165 is a medium vulnerability (CVSS 6.8) in Watchguard Xcs, published May 23, 2011. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 5.16%, the 92nd percentile. No source names a fixed version.
References
exchange.xforce.ibmcloud.com/vulnerabilities/67729
secunia.com/advisories/44753
kb.cert.org/vuls/id/MAPG-8D9M75
watchguard.com/support/release-notes/xcs/9/en-US/EN_ReleaseNotes_XCS_9_1_1/EN_ReleaseNotes_WG_XCS_9_1_TLS_Hotfix.pdf
nvd.nist.gov/vuln/detail/CVE-2011-2165
github.com/advisories/GHSA-7445-q6fm-5g46