Is CVE-2021-39935 actively exploited?

Yes. CVE-2021-39935 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-39935 be exploited remotely?

Yes. CVE-2021-39935 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-39935?

CVE-2021-39935 has a CVSS score of 7.5 (HIGH) and an EPSS exploitation probability of 54.31%.

HOME VULNERABILITIESCVE-2021-39935

HIGHCISA KEVIN THE WILD

CVE-2021-39935

Published: February 3, 2026

7.5

CVSS v3.1

EPSS:54.31%probability of exploitation in 30 daysPercentile:98.0th

Official Description

GitLab Community and Enterprise Editions contain a server-side request forgery vulnerability which could allow unauthorized external users to perform Server Side Requests via the CI Lint API.

NVD Source

CISA KEV Advisory

GitLab Community and Enterprise Editions Server-Side Request Forgery (SSRF) Vulnerability

GitLab Community and Enterprise Editions contain a server-side request forgery vulnerability which could allow unauthorized external users to perform Server Side Requests via the CI Lint API.

Added to KEV: 2026-02-03Federal patch deadline: 2026-02-24

Required Action (CISA)

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Risk Analysis

This vulnerability in GitLab Community and Enterprise Editions allows an attacker to make the server perform requests to internal resources, potentially exposing sensitive information. With a CVSS score of 7.5 (HIGH) and an EPSS score of 0.54311, this flaw presents a significant risk. Its inclusion in CISA's KEV catalog further emphasizes its urgency.

Active exploitation of this vulnerability has been observed in the wild, and it is listed in CISA's Known Exploited Vulnerabilities catalog. The CVSS vector indicates it is remotely exploitable without requiring authentication or user interaction.

Recommended Action

Administrators should apply the latest security updates for GitLab Community and Enterprise Editions. Regularly review network configurations to restrict outbound connections from internal systems where possible.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2021-39935 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 7.5.

CISA has added CVE-2021-39935 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.