CVE-2014-3556

medium F5
CVSS v3 Base Score
6.8
AV:N/AC:M/Au:N/C:P/I:P/A:P
EPSS Score
48.2%
Exploitation probability in 30 days
Top 2% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
M
Confidentiality
P
Integrity
P
Availability
P
Published: December 29, 2014 (4153 days ago)
Last Modified: May 6, 2026
Vendor: F5
Source: NVD

Description

The STARTTLS implementation in mail/ngx_mail_smtp_handler.c in the SMTP proxy in nginx 1.5.x and 1.6.x before 1.6.1 and 1.7.x before 1.7.4 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.

CWE

CWE-77

Affected Products

f5 nginx

References

🔗 mailman.nginx.org 🔗 marc.info 🔗 nginx.org 🔗 bugzilla.redhat.com 🔗 mailman.nginx.org