Is CVE-2021-4191 actively exploited?

Yes. KEV Intelligence tracks CVE-2021-4191 as a known exploited vulnerability. Confidence is high.

What exploitation activity has KEV Intelligence observed?

KEV Intelligence has not yet recorded sensor-observed exploitation attempts for CVE-2021-4191. Our sensors continue to monitor for activity targeting this CVE.

Which versions are affected?

CVE-2021-4191 affects GitLab GitLab. Reported affected versions include >=14.8, =14.7, =13.0, <14.6.5.

No. CVE-2021-4191 is not currently listed in CISA KEV.

Vulnerability report

Exploited in the wild High confidence Not in CISA KEV

CVE-2021-4191

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?

No. CVE-2021-4191 is not currently listed in CISA KEV.

GitLab

GitLab / GitLab · >=14.8, <14.8.2

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Severity: CVSS 5.3 · Medium
Confidence: High
Exploit status: Exploited in the wild
EPSS: 80.0%
First observed: —
Last observed: —

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2021-4191 is an unauthenticated vulnerability affecting GitLab GitLab. An issue has been discovered in GitLab CE/EE affecting versions 13.0 to 14.6.5, 14.7 to 14.7.4, and 14.8 to 14.8.2. Private GitLab instances...

Is it exploited?

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

Who is affected?

GitLab / GitLab >=14.8, <14.8.2.

What should we do?

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

Overview

An issue has been discovered in GitLab CE/EE affecting versions 13.0 to 14.6.5, 14.7 to 14.7.4, and 14.8 to 14.8.2

An issue has been discovered in GitLab CE/EE affecting versions 13.0 to 14.6.5, 14.7 to 14.7.4, and 14.8 to 14.8.2.

Private GitLab instances with restricted sign-ups may be vulnerable to user enumeration to unauthenticated users through the GraphQL API.

Vendor Product Affected Status

GitLab GitLab >=14.8, <14.8.2 Affected

GitLab GitLab >=14.7, <14.7.4 Affected

GitLab GitLab >=13.0, <14.6.5 Affected

Published: 28 Mar 2022
Exploitation Reported: 28 Apr 2025
Attack vector: Remote
Complexity: Low
Privileges: None
User interaction: None

CVE References

CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2021-4191
gitlab.com/gitlab-org/gitlab/-/issues/343898 gitlab.com · CVE Record https://gitlab.com/gitlab-org/gitlab/-/issues/343898
hackerone.com/reports/1089609 hackerone.com · CVE Record https://hackerone.com/reports/1089609
gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-... gitlab.com · CVE Record https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-4191.json

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

The Shadowserver

Recorded 28 Apr 2025

Independent exploitation attestation added to the KEV Intelligence record.

Proof of concept available

GitHub

Recorded 05 Jun 2023

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

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

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Source	Added
The Shadowserver First	2025-04-28 00:00 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

Nuclei template detected 25 Apr 2025.

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Virtual patch status

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

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Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner	Reference	Detected
Nuclei	https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-4191.yaml	25 Apr 2025

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

5.3 Medium

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

EPSS

80.0%

All CVSS Scores

CVSS v3.1 5.3 Medium

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

CVSS v2.0 5.0 Medium

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

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

GitLab GraphQL API User Enumeration

nuclei · Created Unknown

Timeline

From disclosure to observed exploitation

12 Jun 2026
Public PoC available

Public proof-of-concept code published
28 Apr 2025
Added to KEV Intelligence KEV Feed

High-confidence, third-party attested exploitation
25 Apr 2025
Nuclei template available

Scanner coverage available
28 Mar 2022
CVE published

Vulnerability disclosed publicly
30 Dec 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-2021-4191

Free JSON includes basic KEV fields

{
  "cve_id": "CVE-2021-4191",
  "confidence": "High",
  "cvss_score": 5.3,
  "cvss_estimated": false,
  "epss_score": 0.80004,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

Early warning alerts

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