CVE-2016-9920

Name: CVE-2016-9920
Creator: NVD / NIST
Published: 2016-12-08T18:59:00.2+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 5.62%

Last modified Jun 17, 2026

CVE-2016-9920 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 5.62% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability

5.62%

91.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-284

Affected Software

Vendor	Product	Versions
Roundcube	Webmail	<= 1.1.6
Roundcube	Webmail	1.2.0
Roundcube	Webmail	1.2.1
Roundcube	Webmail	1.2.2

References

http://www.openwall.com/lists/oss-security/2016/12/08/10Mailing List, Third Party Advisory
http://www.securityfocus.com/bid/94858
https://blog.ripstech.com/2016/roundcube-command-execution-via-email/Exploit, Third Party Advisory
https://roundcube.net/news/2016/11/28/updates-1.2.3-and-1.1.7-releasedRelease Notes, Vendor Advisory
https://security.gentoo.org/glsa/201612-44
http://www.openwall.com/lists/oss-security/2016/12/08/10Mailing List, Third Party Advisory
http://www.securityfocus.com/bid/94858
https://blog.ripstech.com/2016/roundcube-command-execution-via-email/Exploit, Third Party Advisory
https://roundcube.net/news/2016/11/28/updates-1.2.3-and-1.1.7-releasedRelease Notes, Vendor Advisory
https://security.gentoo.org/glsa/201612-44

Timeline

Published: Dec 8, 2016
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2016-9920?

How severe is CVE-2016-9920?

Severity scoring for CVE-2016-9920 is pending analysis. The EPSS model estimates a 5.62% probability of exploitation in the next 30 days.

How do I fix CVE-2016-9920?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2016-9920?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST