Vulnerability Report

CVE-2016-9920

RCE

Title: Roundcube Webmail RCE

RCE

Proof Of Concept

PoC Available for CVE-2016-9920

CWE Category CWE-284
Published Date Dec 08, 2016
Modified Date Jun 17, 2026
Exploit Status Available
Score 7.5 CVSS v3.0
Exploit Probability (EPSS)
5.62%

Vulnerability Summary

CVE-2016-9920: steps/mail/sendmail.inc in Roundcube before 1.1.7 and 1.2.x before 1.2.3, when no SMTP server is configured and the sendmail program is enabled, does not properly restrict the use of custom envelope-from addresses on the sendmail command line, which allows remote authenticated users to execute arbitrary code via a modified HTTP request that sends a crafted e-mail message.

Impacted Vendors

C
cobalt 1
R
roundcube 1
V
vdesk 1

Reference Links

http://www.openwall.com/lists/oss-security/2016/12/08/10 http://www.securityfocus.com/bid/94858 https://blog.ripstech.com/2016/roundcube-command-execution-via-email/ https://roundcube.net/news/2016/11/28/updates-1.2.3-and-1.1.7-released https://security.gentoo.org/glsa/201612-44 http://www.openwall.com/lists/oss-security/2016/12/08/10 http://www.securityfocus.com/bid/94858 https://blog.ripstech.com/2016/roundcube-command-execution-via-email/ https://roundcube.net/news/2016/11/28/updates-1.2.3-and-1.1.7-released https://security.gentoo.org/glsa/201612-44
CVSS v3.0
Source Entity [email protected]
Severity HIGH
7.5
Attack Vector
NETWORK
Complexity
HIGH
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v2.0
Source Entity [email protected]
Severity MEDIUM
6.0
Access Vector
N/A
Authentication
N/A
RAW VECTOR AV:N/AC:M/Au:S/C:P/I:P/A:P

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2016-9920 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/t0kx/exploit-CVE-2016-9920
View Code
MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity HIGH
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Stack

No specific products linked.