CVE-2021-22242

HIGHNVD 8.78.9▲
EchelonGraph scoreHIGH confidence

Score elevated to 8.9 because EPSS predicts 64% probability of exploitation within the next 30 days (top 0.9% of all CVEs). NVD baseline CVSS 8.7 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, nvd
Elevated
8.9EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • 1 internet-exposed host is running an affected version right now
  • High exploitation likelihood — EPSS 64%
CISA-KEV: Not listedEPSS PROB: 64%CVSS: 8.7Exploit: Elevated riskExposed: 1

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

Insufficient input sanitization in Mermaid markdown in GitLab CE/EE version 11.4 and up allows an attacker to exploit a stored cross-site scripting vulnerability via a specially-crafted markdown

Live · internet exposure

1 internet-exposed host is running an affected version of CVE-2021-22242 right now.

across 1 countries (United States)top: gitlab
See the live KEV-Exposure radar →Found passively from public internet-scan data — aggregate, host-redacted.

EchelonGraph is the only CVE feed that fuses live vulnerability intelligence with its own live internet-exposure radar — so you see not just that a CVE is exploited, but how much of the internet is exposed to it right now.

CVSS v3
8.7
EG Score
8.9(high)
EG Risk
70(Track)
EG Risk 70/100SSVC: 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
Severity89% × 45%
Exploitation64% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
64%
EPSS %ILE
99%
KEV
Not listed

Published

August 25, 2021

Last Modified

November 21, 2024

Advisory Details (3)

Auto-updated Sep 1, 2026
No patch confirmed yet.
generic

HackerOne

https://hackerone.com/reports/1212822
generic

Stored XSS in Mermaid when viewing Markdown files (#332528) · Issues · GitLab.org / GitLab · GitLab

https://gitlab.com/gitlab-org/gitlab/-/issues/332528
generic

2021/CVE-2021-22242.json · master · GitLab.org / GitLab CVE assignments · GitLab

https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22242.json

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 23× 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.

Showing the most recent 100 of 112 total refreshes for this CVE.

  1. 2026-09-06 13:44 UTCEPSS rescore
  2. 2026-09-06 13:44 UTCEPSS rescore
  3. 2026-09-06 09:30 UTCOSV refresh
  4. 2026-09-05 15:25 UTCEPSS rescore
  5. 2026-09-04 13:57 UTCEPSS rescore
  6. 2026-09-02 14:08 UTCEPSS rescore
  7. 2026-09-01 03:32 UTCEPSS rescore
  8. 2026-08-30 19:14 UTCEPSS rescore
  9. 2026-08-30 01:19 UTCEPSS rescore
  10. 2026-08-28 21:37 UTCEPSS rescore
  11. 2026-08-26 14:42 UTCEPSS rescore
  12. 2026-08-23 00:16 UTCEPSS rescore
  13. 2026-08-21 23:46 UTCEPSS rescore
  14. 2026-08-20 22:52 UTCEPSS rescore
  15. 2026-08-19 20:04 UTCOSV refresh
  16. 2026-08-19 17:01 UTCEPSS rescore
  17. 2026-08-18 13:45 UTCEPSS rescore
  18. 2026-08-17 13:43 UTCEPSS rescore
  19. 2026-08-16 02:11 UTCEPSS rescore
  20. 2026-08-15 01:27 UTCEPSS rescore
  21. 2026-08-13 21:57 UTCEPSS rescore
  22. 2026-08-12 13:47 UTCEPSS rescore
  23. 2026-08-11 13:38 UTCEPSS rescore
  24. 2026-08-09 13:43 UTCEPSS rescore
  25. 2026-08-08 16:33 UTCEPSS rescore
Show 75 more
  1. 2026-08-07 16:23 UTCEPSS rescore
  2. 2026-08-06 13:43 UTCEPSS rescore
  3. 2026-08-04 15:29 UTCOSV refresh
  4. 2026-08-04 15:06 UTCEPSS rescore
  5. 2026-07-30 16:25 UTCEPSS rescore
  6. 2026-07-30 01:27 UTCEPSS rescore
  7. 2026-07-30 01:27 UTCEPSS rescore
  8. 2026-07-26 14:52 UTCEPSS rescore
  9. 2026-07-25 14:15 UTCEPSS rescore
  10. 2026-07-24 14:15 UTCEPSS rescore
  11. 2026-07-23 14:15 UTCEPSS rescore
  12. 2026-07-23 01:57 UTCEG score recompute▲ 0.20
  13. 2026-07-22 22:44 UTCEG score recompute
  14. 2026-07-22 14:05 UTCEPSS rescore
  15. 2026-07-20 17:04 UTCEPSS rescore
  16. 2026-07-19 14:28 UTCEPSS rescore
  17. 2026-07-18 13:29 UTCOSV refresh
  18. 2026-07-18 10:02 UTCEPSS rescore
  19. 2026-07-15 16:55 UTCEPSS rescore
  20. 2026-07-15 16:55 UTCEPSS rescore
  21. 2026-07-13 22:27 UTCEPSS rescore
  22. 2026-07-13 22:27 UTCEPSS rescore
  23. 2026-07-13 06:10 UTCEPSS rescore
  24. 2026-07-13 06:10 UTCEPSS rescore
  25. 2026-07-11 08:25 UTCEPSS rescore
  26. 2026-07-09 19:07 UTCEPSS rescore
  27. 2026-07-04 06:29 UTCEPSS rescore
  28. 2026-07-04 06:29 UTCEPSS rescore
  29. 2026-07-01 15:03 UTCEPSS rescore
  30. 2026-06-30 17:00 UTCOSV refresh
  31. 2026-06-28 14:05 UTCEPSS rescore
  32. 2026-06-28 04:54 UTCEPSS rescore
  33. 2026-06-28 04:54 UTCEPSS rescore
  34. 2026-06-27 03:06 UTCEPSS rescore
  35. 2026-06-27 03:06 UTCEPSS rescore
  36. 2026-06-25 13:48 UTCEPSS rescore
  37. 2026-06-25 13:48 UTCEPSS rescore
  38. 2026-06-23 21:31 UTCEPSS rescore
  39. 2026-06-23 21:31 UTCEPSS rescore
  40. 2026-06-21 01:58 UTCEPSS rescore
  41. 2026-06-21 01:57 UTCEPSS rescore
  42. 2026-06-18 17:51 UTCEPSS rescore
  43. 2026-06-18 17:51 UTCEPSS rescore
  44. 2026-06-17 17:51 UTCEPSS rescore
  45. 2026-06-16 17:50 UTCEPSS rescore
  46. 2026-06-15 17:46 UTCEPSS rescore
  47. 2026-06-14 23:15 UTCEPSS rescore
  48. 2026-06-13 22:58 UTCEPSS rescore
  49. 2026-06-12 23:37 UTCOSV refresh
  50. 2026-06-12 23:10 UTCEPSS rescore
  51. 2026-06-12 23:10 UTCEPSS rescore
  52. 2026-06-11 13:58 UTCEPSS rescore
  53. 2026-06-10 22:16 UTCEPSS rescore
  54. 2026-06-10 22:16 UTCEPSS rescore
  55. 2026-06-10 13:20 UTCEPSS rescore
  56. 2026-06-08 14:15 UTCEPSS rescore
  57. 2026-06-08 14:15 UTCEPSS rescore
  58. 2026-06-07 15:23 UTCEPSS rescore
  59. 2026-06-07 15:23 UTCEPSS rescore
  60. 2026-06-06 13:46 UTCEPSS rescore
  61. 2026-06-06 13:46 UTCEPSS rescore
  62. 2026-06-06 13:46 UTCEPSS rescore
  63. 2026-06-05 22:45 UTCEPSS rescore
  64. 2026-06-05 22:45 UTCEPSS rescore
  65. 2026-06-05 06:09 UTCEPSS rescore
  66. 2026-06-05 06:09 UTCEPSS rescore
  67. 2026-06-05 06:08 UTCEPSS rescore
  68. 2026-06-04 13:10 UTCEPSS rescore
  69. 2026-06-02 20:11 UTCEPSS rescore
  70. 2026-06-02 20:11 UTCEPSS rescore
  71. 2026-06-01 13:50 UTCEPSS rescore
  72. 2026-06-01 13:50 UTCEPSS rescore
  73. 2026-05-31 22:29 UTCEPSS rescore
  74. 2026-05-31 22:29 UTCEPSS rescore
  75. 2026-05-31 00:15 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2021-22242?
CVE-2021-22242 is a high vulnerability published on August 25, 2021. Insufficient input sanitization in Mermaid markdown in GitLab CE/EE version 11.4 and up allows an attacker to exploit a stored cross-site scripting vulnerability via a specially-crafted markdown
When was CVE-2021-22242 disclosed?
CVE-2021-22242 was first published in the National Vulnerability Database on August 25, 2021, 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-2021-22242 actively exploited?
CVE-2021-22242 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 64% probability of exploitation in the next 30 days, which ranks it in the top 0.8% of all scored CVEs.
What is the CVSS score of CVE-2021-22242?
CVE-2021-22242 has a CVSS v3 base score of 8.7 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.9.
How do I remediate CVE-2021-22242?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-22242, 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

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