CVE-2011-2165

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.

CVE ID:

CVE-2011-2165

Published:

2011-05-23

Modified:

2026-04-29

CVSS Score:

6.8

Severity:

MEDIUM

Vector:

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