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CVE-2016-9920

21
FAUCET Score

CVE-2016-9920 is a high-severity vulnerability affecting Roundcube webmail versions prior to 1.1.7 and 1.2.3. It allows remote authenticated users to execute arbitrary code by crafting an email message, specifically when no SMTP server is configured and the sendmail program is enabled, due to improper restriction of custom envelope-from addresses. The attack requires low privileges but has high impact on confidentiality, integrity, and availability, with a CVSS score of 7.5. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.1.6CPE matchmatch criteria
cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*
1.2.0CPE matchmatch criteria
cpe:2.3:a:roundcube:webmail:1.2.0:*:*:*:*:*:*:*
1.2.1CPE matchmatch criteria
cpe:2.3:a:roundcube:webmail:1.2.1:*:*:*:*:*:*:*
1.2.2CPE matchmatch criteria
cpe:2.3:a:roundcube:webmail:1.2.2:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.6
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
5.62%
Probability of exploitation in next 30 days
EPSS Percentile
92.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0562 is in the 92nd percentile among its peer group of 1,162 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

ubuntupatch availablevia ubuntu_usn
Product: roundcube (bionic)Fixed in: 1.3.6+dfsg.1-1ubuntu0.1~esm7
ubuntupatch availablevia ubuntu_usn
Product: roundcube (xenial)Fixed in: 1.2~beta+dfsg.1-0ubuntu1+esm7

Vendor Advisories (1)

ubuntuUSN-8132-1

Roundcube Webmail vulnerabilities

Mar 30, 2026

References

blog.ripstech.com / 2016/roundcube-command-execution-via-email
ExploitThird Party Advisory
roundcube.net / news/2016/11/28/updates-1.2.3-and-1.1.7-released
Release NotesVendor Advisory
security.gentoo.org / glsa/201612-44
openwall.com / lists/oss-security/2016/12/08/10
Mailing ListThird Party Advisory
securityfocus.com / bid/94858