CVE-2021-4191

HIGHNVD 5.38.7▲
EchelonGraph scoreHIGH confidence

Score elevated to 8.7 because EPSS predicts 80% probability of exploitation within the next 30 days (top 0.4% of all CVEs). NVD baseline CVSS 5.3 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, ghsa, nvd
Weaponized
8.7EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 80%
  • Public exploit code is available (Metasploit, epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 80%CVSS: 5.3Exploit: Metasploit · epss top5pct · epss high · public exploitExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
5.3
EG Score
8.7(high)
EG Risk
76(Track)
EG Risk 76/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity87% × 45%
Exploitation80% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
80%
EPSS %ILE
100%
KEV
Not listed

Published

March 28, 2022

Last Modified

November 21, 2024

References (6)

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 6× in last 7d / 18× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-25 01:54 UTCOSV refresh
  2. 2026-09-24 14:00 UTCEPSS rescore
  3. 2026-09-24 14:00 UTCEPSS rescore
  4. 2026-09-22 14:44 UTCEPSS rescore
  5. 2026-09-21 20:28 UTCEPSS rescore
  6. 2026-09-18 19:24 UTCEPSS rescore
  7. 2026-09-17 19:23 UTCEPSS rescore
  8. 2026-09-15 03:06 UTCEPSS rescore
  9. 2026-09-11 14:49 UTCEPSS rescore
  10. 2026-09-11 09:33 UTCEPSS rescore
  11. 2026-09-06 13:45 UTCEPSS rescore
  12. 2026-09-05 17:25 UTCOSV refresh
  13. 2026-09-05 15:25 UTCEPSS rescore
  14. 2026-09-04 13:57 UTCEPSS rescore
  15. 2026-09-02 14:09 UTCEPSS rescore
  16. 2026-08-30 19:14 UTCEPSS rescore
  17. 2026-08-28 21:38 UTCEPSS rescore
  18. 2026-08-26 14:43 UTCEPSS rescore
  19. 2026-08-24 14:13 UTCEPSS rescore
  20. 2026-08-21 23:46 UTCEPSS rescore
  21. 2026-08-20 22:52 UTCEPSS rescore
  22. 2026-08-19 17:01 UTCEPSS rescore
  23. 2026-08-19 04:29 UTCOSV refresh
  24. 2026-08-16 02:11 UTCEPSS rescore
  25. 2026-08-15 01:27 UTCEPSS rescore
Show 58 more
  1. 2026-08-12 13:48 UTCEPSS rescore
  2. 2026-08-11 13:38 UTCEPSS rescore
  3. 2026-08-06 13:44 UTCEPSS rescore
  4. 2026-08-05 19:15 UTCEPSS rescore
  5. 2026-08-04 10:34 UTCEPSS rescore
  6. 2026-08-04 00:27 UTCOSV refresh
  7. 2026-07-30 16:25 UTCEPSS rescore
  8. 2026-07-26 14:52 UTCEPSS rescore
  9. 2026-07-24 14:15 UTCEPSS rescore
  10. 2026-07-24 14:15 UTCEPSS rescore
  11. 2026-07-23 02:04 UTCEG score recompute▲ 3.40
  12. 2026-07-22 22:51 UTCEG score recompute▼ 3.70
  13. 2026-07-22 14:06 UTCEPSS rescore
  14. 2026-07-20 17:05 UTCEPSS rescore
  15. 2026-07-17 18:59 UTCOSV refresh
  16. 2026-07-16 17:00 UTCEPSS rescore
  17. 2026-07-16 17:00 UTCEPSS rescore
  18. 2026-07-15 16:55 UTCEPSS rescore
  19. 2026-07-13 22:27 UTCEPSS rescore
  20. 2026-07-09 19:07 UTCEPSS rescore
  21. 2026-07-09 19:07 UTCEPSS rescore
  22. 2026-07-06 02:21 UTCEPSS rescore
  23. 2026-07-06 02:21 UTCEPSS rescore
  24. 2026-06-30 23:20 UTCEPSS rescore
  25. 2026-06-29 17:02 UTCOSV refresh
  26. 2026-06-27 03:07 UTCEPSS rescore
  27. 2026-06-27 03:06 UTCEPSS rescore
  28. 2026-06-25 13:48 UTCEPSS rescore
  29. 2026-06-25 13:48 UTCEPSS rescore
  30. 2026-06-24 14:03 UTCEPSS rescore
  31. 2026-06-24 14:03 UTCEPSS rescore
  32. 2026-06-23 21:31 UTCEPSS rescore
  33. 2026-06-23 21:31 UTCEPSS rescore
  34. 2026-06-21 14:55 UTCEPSS rescore
  35. 2026-06-21 01:58 UTCEPSS rescore
  36. 2026-06-21 01:58 UTCEPSS rescore
  37. 2026-06-16 17:51 UTCEPSS rescore
  38. 2026-06-15 17:46 UTCEPSS rescore
  39. 2026-06-14 23:15 UTCEPSS rescore
  40. 2026-06-14 23:15 UTCEPSS rescore
  41. 2026-06-13 22:58 UTCEPSS rescore
  42. 2026-06-13 22:58 UTCEPSS rescore
  43. 2026-06-12 23:10 UTCEPSS rescore
  44. 2026-06-12 05:57 UTCOSV refresh
  45. 2026-06-10 22:16 UTCEPSS rescore
  46. 2026-06-08 14:15 UTCEPSS rescore
  47. 2026-06-08 14:15 UTCEPSS rescore
  48. 2026-06-08 14:15 UTCEPSS rescore
  49. 2026-06-05 22:45 UTCEPSS rescore
  50. 2026-06-05 22:45 UTCEPSS rescore
  51. 2026-06-02 20:11 UTCEPSS rescore
  52. 2026-06-02 20:11 UTCEPSS rescore
  53. 2026-05-28 13:43 UTCEPSS rescore
  54. 2026-05-28 13:43 UTCEPSS rescore
  55. 2026-05-27 13:39 UTCEPSS rescore
  56. 2026-05-27 13:39 UTCEPSS rescore
  57. 2026-05-26 00:58 UTCEG score recompute
  58. 2026-05-26 00:58 UTCGHSA enrichment

Publicly available exploits

(3 references)

Working exploit code is in the public domain (1 Metasploit module) (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCK3ysTr0K3R/CVE-2021-4191-EXPLOIT
    First seen Jul 22, 2023

    A PoC exploit for CVE-2021-4191 - GitLab User Enumeration.

    Open source ↗
  • Metasploitauxiliary/scanner/http/gitlab_graphql_user_enum✓ verified
    First seen Feb 25, 2022

    GitLab GraphQL API User Enumeration

    Open source ↗
  • Nucleihttp/cves/2021/CVE-2021-4191.yaml
    First seen Jan 1, 2021

    GitLab GraphQL API User Enumeration

    Open source ↗

Related CVEs

Related CVEs are temporarily unavailable — the same-product, same-vendor and same-CWE lists could not be loaded just now. That is not a sign that none exist; please retry shortly.

Frequently asked(5)

What is CVE-2021-4191?
CVE-2021-4191 is a high vulnerability published on March 28, 2022. 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.
When was CVE-2021-4191 disclosed?
CVE-2021-4191 was first published in the National Vulnerability Database on March 28, 2022, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-4191 actively exploited?
CVE-2021-4191 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 80% probability of exploitation in the next 30 days, which ranks it in the top 0.4% of all scored CVEs.
What is the CVSS score of CVE-2021-4191?
CVE-2021-4191 has a CVSS v3 base score of 5.3 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.7.
How do I remediate CVE-2021-4191?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-4191, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2021-4191

Explore →

Is Your Infrastructure Affected by CVE-2021-4191?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs