What is the CVSS score of CVE-2016-9920?

CVE-2016-9920 has a CVSS 3.0 base score of 7.5 (High). CVSS vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 38.3%.

Is there a public PoC exploit available for CVE-2016-9920?

Yes, a public proof-of-concept exploit is available for CVE-2016-9920. Prioritise patching immediately. EPSS: 38.3%.

Webmail CVE-2016-9920

HIGH

Improper Access Control (CWE-284)

2016-12-08 cve@mitre.org

RCE Authentication Bypass Webmail

7.5

CVSS 3.0 · NVD

Severity by source

NVD PRIMARY

7.5 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

High

Integrity

High

Availability

High

Lifecycle Timeline

CVE Published

Dec 08, 2016 - 18:59 cve.org

HIGH 7.5

DescriptionCVE.org

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.

AnalysisAI

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. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable. Public exploit code available and EPSS exploitation probability 38.3%.

Technical ContextAI

This vulnerability is classified under CWE-284. 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. Affected products include: Roundcube Webmail. Version information: before 1.1.7.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.