CVE-2024-21388

MEDIUMNVD 6.56.6▲
EchelonGraph scoreHIGH confidence

Score elevated to 6.6 because EPSS predicts 32% probability of exploitation within the next 30 days (top 1.9% of all CVEs). NVD baseline CVSS 6.5 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, ghsa, nvd
Elevated
6.6EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 32%CVSS: 6.5Exploit: Elevated riskExposed: 0

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

Microsoft Edge (Chromium-based) Elevation of Privilege Vulnerability

CVSS v3
6.5
EG Score
6.6(high)
EG Risk
46(Track)
EG Risk 46/100SSVC: 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
Severity66% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
32%
EPSS %ILE
98%
KEV
Not listed

Published

January 30, 2024

Last Modified

November 21, 2024

References (2)

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 3× in last 7d / 19× 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 136 total refreshes for this CVE.

  1. 2026-09-24 14:01 UTCEPSS rescore
  2. 2026-09-23 13:46 UTCEPSS rescore
  3. 2026-09-23 13:46 UTCEPSS rescore
  4. 2026-09-16 14:06 UTCEPSS rescore
  5. 2026-09-16 05:11 UTCEPSS rescore
  6. 2026-09-15 03:08 UTCEPSS rescore
  7. 2026-09-12 14:59 UTCEPSS rescore
  8. 2026-09-11 14:51 UTCEPSS rescore
  9. 2026-09-11 09:34 UTCEPSS rescore
  10. 2026-09-08 21:58 UTCEPSS rescore
  11. 2026-09-06 13:46 UTCEPSS rescore
  12. 2026-09-05 15:26 UTCEPSS rescore
  13. 2026-09-04 13:58 UTCEPSS rescore
  14. 2026-09-02 14:10 UTCEPSS rescore
  15. 2026-09-01 13:52 UTCEPSS rescore
  16. 2026-08-30 19:15 UTCEPSS rescore
  17. 2026-08-30 01:20 UTCEPSS rescore
  18. 2026-08-28 21:39 UTCEPSS rescore
  19. 2026-08-26 14:44 UTCEPSS rescore
  20. 2026-08-25 13:47 UTCEPSS rescore
  21. 2026-08-23 00:17 UTCEPSS rescore
  22. 2026-08-21 23:47 UTCEPSS rescore
  23. 2026-08-20 22:53 UTCEPSS rescore
  24. 2026-08-19 17:02 UTCEPSS rescore
  25. 2026-08-18 13:46 UTCEPSS rescore
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  1. 2026-08-16 02:12 UTCEPSS rescore
  2. 2026-08-15 01:28 UTCEPSS rescore
  3. 2026-08-13 21:58 UTCEPSS rescore
  4. 2026-08-12 13:49 UTCEPSS rescore
  5. 2026-08-11 13:40 UTCEPSS rescore
  6. 2026-08-08 16:35 UTCEPSS rescore
  7. 2026-08-06 13:45 UTCEPSS rescore
  8. 2026-08-05 19:15 UTCEPSS rescore
  9. 2026-08-04 15:08 UTCEPSS rescore
  10. 2026-08-02 02:25 UTCEPSS rescore
  11. 2026-08-02 02:25 UTCEPSS rescore
  12. 2026-08-01 04:14 UTCEPSS rescore
  13. 2026-07-30 16:26 UTCEPSS rescore
  14. 2026-07-30 01:29 UTCEPSS rescore
  15. 2026-07-28 15:34 UTCEPSS rescore
  16. 2026-07-27 14:11 UTCEPSS rescore
  17. 2026-07-26 14:53 UTCEPSS rescore
  18. 2026-07-25 14:16 UTCEPSS rescore
  19. 2026-07-24 14:16 UTCEPSS rescore
  20. 2026-07-23 14:17 UTCEPSS rescore
  21. 2026-07-23 14:17 UTCEPSS rescore
  22. 2026-07-23 02:33 UTCEG score recompute▲ 0.10
  23. 2026-07-22 23:20 UTCEG score recompute
  24. 2026-07-22 14:07 UTCEPSS rescore
  25. 2026-07-21 15:23 UTCEPSS rescore
  26. 2026-07-21 15:23 UTCEPSS rescore
  27. 2026-07-20 17:06 UTCEPSS rescore
  28. 2026-07-19 14:30 UTCEPSS rescore
  29. 2026-07-19 14:30 UTCEPSS rescore
  30. 2026-07-18 10:03 UTCEPSS rescore
  31. 2026-07-18 10:03 UTCEPSS rescore
  32. 2026-07-15 16:56 UTCEPSS rescore
  33. 2026-07-15 16:56 UTCEPSS rescore
  34. 2026-07-13 06:11 UTCEPSS rescore
  35. 2026-07-13 06:11 UTCEPSS rescore
  36. 2026-07-12 05:45 UTCEPSS rescore
  37. 2026-07-11 08:26 UTCEPSS rescore
  38. 2026-07-09 19:09 UTCEPSS rescore
  39. 2026-07-09 19:09 UTCEPSS rescore
  40. 2026-07-08 15:13 UTCEPSS rescore
  41. 2026-07-06 16:26 UTCEPSS rescore
  42. 2026-07-05 02:29 UTCEPSS rescore
  43. 2026-07-01 15:05 UTCEPSS rescore
  44. 2026-06-30 23:21 UTCEPSS rescore
  45. 2026-06-30 23:21 UTCEPSS rescore
  46. 2026-06-28 04:55 UTCEPSS rescore
  47. 2026-06-28 04:55 UTCEPSS rescore
  48. 2026-06-27 03:07 UTCEPSS rescore
  49. 2026-06-27 03:07 UTCEPSS rescore
  50. 2026-06-25 13:48 UTCEPSS rescore
  51. 2026-06-25 13:48 UTCEPSS rescore
  52. 2026-06-24 14:04 UTCEPSS rescore
  53. 2026-06-24 14:04 UTCEPSS rescore
  54. 2026-06-23 21:32 UTCEPSS rescore
  55. 2026-06-23 21:32 UTCEPSS rescore
  56. 2026-06-22 14:24 UTCEPSS rescore
  57. 2026-06-22 14:24 UTCEPSS rescore
  58. 2026-06-21 14:55 UTCEPSS rescore
  59. 2026-06-21 14:55 UTCEPSS rescore
  60. 2026-06-21 01:58 UTCEPSS rescore
  61. 2026-06-21 01:58 UTCEPSS rescore
  62. 2026-06-18 17:51 UTCEPSS rescore
  63. 2026-06-18 17:51 UTCEPSS rescore
  64. 2026-06-17 17:52 UTCEPSS rescore
  65. 2026-06-17 17:52 UTCEPSS rescore
  66. 2026-06-16 17:51 UTCEPSS rescore
  67. 2026-06-16 17:51 UTCEPSS rescore
  68. 2026-06-15 17:47 UTCEPSS rescore
  69. 2026-06-14 23:16 UTCEPSS rescore
  70. 2026-06-13 22:59 UTCEPSS rescore
  71. 2026-06-13 22:59 UTCEPSS rescore
  72. 2026-06-12 23:11 UTCEPSS rescore
  73. 2026-06-11 13:59 UTCEPSS rescore
  74. 2026-06-11 13:59 UTCEPSS rescore
  75. 2026-06-10 22:17 UTCEPSS rescore

Publicly available exploits

(1 reference)

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

  • GitHub PoCd0rb/CVE-2024-21388
    First seen Mar 28, 2024

    This Python script exploits a vulnerability (CVE-2024-21388) in Microsoft Edge, allowing silent installation of browser extensions with elevated privileges via a private API.

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2024-21388?
CVE-2024-21388 is a medium vulnerability published on January 30, 2024. Microsoft Edge (Chromium-based) Elevation of Privilege Vulnerability
When was CVE-2024-21388 disclosed?
CVE-2024-21388 was first published in the National Vulnerability Database on January 30, 2024, 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-2024-21388 actively exploited?
CVE-2024-21388 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 32% probability of exploitation in the next 30 days, which ranks it in the top 1.8% of all scored CVEs.
What is the CVSS score of CVE-2024-21388?
CVE-2024-21388 has a CVSS v3 base score of 6.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 6.6.
How do I remediate CVE-2024-21388?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-21388, 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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