CVE-2014-3556

Severity CVSS v4.0:

Pending analysis

Type:

CWE-77 Command Injection

Publication date:

29/12/2014

Last modified:

12/04/2025

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.

Impact

Vector 2.0

AV:N/AC:M/Au:N/C:P/I:P/A:P CVSS v2.0 Severity and Metrics:

Base Score: 6.80 MEDIUM
Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P

Attack Vector (AV): Network
Attack Complexity (AC): Medium
Authentication (Au): None
Confidentiality (C): Physical
Integrity (I): Physical
Availability (A): Physical

Base Score 2.0

6.80

Severity 2.0

MEDIUM

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:f5:nginx::::::::	1.5.6 (including)	1.6.1 (excluding)
cpe:2.3:a:f5:nginx::::::::	1.7.0 (including)	1.7.4 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2014-3556

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools