Is CVE-2021-39935 actively exploited?

Yes. KEV Intelligence tracks CVE-2021-39935 as a known exploited vulnerability. Confidence is confirmed.

What exploitation activity has KEV Intelligence observed?

KEV Intelligence has not yet recorded sensor-observed exploitation attempts for CVE-2021-39935. Our sensors continue to monitor for activity targeting this CVE.

Which versions are affected?

CVE-2021-39935 affects GitLab GitLab. Reported affected versions include >=10.5, =14.4, =14.5, <14.5.2.

Yes. CVE-2021-39935 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. KEV Intelligence attested it 1 day ahead of CISA.

Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2021-39935

Q: How should organizations remediate it?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Q: Is it in CISA KEV?

Yes. CVE-2021-39935 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. KEV Intelligence attested it 1 day ahead of CISA.

GitLab

GitLab / GitLab · >=10.5, <14.3.6

View live feed Monitor via API

Severity: CVSS 6.8 · Medium
Confidence: Confirmed
Exploit status: Exploited in the wild
EPSS: 35.6%
First observed: —
Last observed: —

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2021-39935 is an unauthenticated vulnerability affecting GitLab GitLab. An issue has been discovered in GitLab CE/EE affecting all versions starting from 10.5 before 14.3.6, all versions starting from 14.4 before...

Is it exploited?

Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.

Who is affected?

GitLab / GitLab >=10.5, <14.3.6.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

GitLab

An issue has been discovered in GitLab CE/EE affecting all versions starting from 10.5 before 14.3.6, all versions starting from 14.4 before 14.4.4, all versions starting from 14.5 before 14.5.2.

Unauthorized external users could perform Server Side Requests via the CI Lint API

Vendor Product Affected Status

GitLab GitLab >=10.5, <14.3.6 Affected

GitLab GitLab >=14.4, <14.4.4 Affected

GitLab GitLab >=14.5, <14.5.2 Affected

Published: 13 Dec 2021
Exploitation Reported: 01 Jun 2026
Attack vector: Remote
Complexity: High
Privileges: None
User interaction: None

CVE References

CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2021-39935
gitlab.com/gitlab-org/gitlab/-/issues/346187 gitlab.com · CVE Record https://gitlab.com/gitlab-org/gitlab/-/issues/346187
hackerone.com/reports/1236965 hackerone.com · CVE Record https://hackerone.com/reports/1236965
gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-... gitlab.com · CVE Record https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39935....

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CVE

Recorded 01 Jun 2026

Independent exploitation attestation added to the KEV Intelligence record.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.

Learn about Pro API access

Source	Added
CVE First	2026-06-01 10:50 UTC
CISA	2026-06-02 14:03 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets: 0
User-Agents: 0

Raw values available in Pro and Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

6.8 Medium

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

EPSS

35.6%

Weaknesses

Server-Side Request Forgery (SSRF) CWE-918

All CVSS Scores

CVSS v3.1 6.8 Medium

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

CVSS v2.0 5.0 Medium

AV:N/AC:L/Au:N/C:P/I:N/A:N

Timeline

From disclosure to observed exploitation

02 Jun 2026
Added to CISA KEV

Listed in the CISA Known Exploited Vulnerabilities catalog
01 Jun 2026
Added to KEV Intelligence KEV Feed

High-confidence, third-party attested exploitation
13 Dec 2021
CVE published

Vulnerability disclosed publicly
23 Aug 2021
CVE ID reserved

Identifier reserved by the CNA

Pro API

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Evidence confidence and provenance
First-party sensor telemetry
PoC and scanner references
Affected versions and enrichment
Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2021-39935

Free JSON includes basic KEV fields

{
  "cve_id": "CVE-2021-39935",
  "confidence": "Confirmed",
  "cvss_score": 6.8,
  "cvss_estimated": false,
  "epss_score": 0.35649,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

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CVE-2021-39935

GitLab

Tags

CVE References

Exploited in the wild

Known exploited vulnerability sources

Observed signals

Scanner coverage

Virtual patch status

Weaknesses

All CVSS Scores

Added to CISA KEV

Added to KEV Intelligence KEV Feed

CVE published

CVE ID reserved

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