CVE-2024-21338

CRITICALNVD 7.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2024-03-04), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 7.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 5 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 60%CVSS: 7.8Exploit: cisa kev · ssvc active · kev ransomware · 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.

Windows Kernel Elevation of Privilege Vulnerability

CVSS v3
7.8
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
60%
EPSS %ILE
99%
KEV
⚠ Exploited

Published

February 13, 2024

Last Modified

August 10, 2026

Advisory Details (5)

Auto-updated Jun 4, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: microsoft, cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-21338
generic🟡 PoC Available

Microsoft Windows 11 - Kernel Privilege Escalation - Windows local Exploit

https://www.exploit-db.com/exploits/52275
generic

Packet Storm

https://packetstorm.news/files/id/190586/
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21338
generic🔴 Active Exploitation

Gen Blogs | Lazarus and the FudModule Rootkit: Beyond BYOVD with an Admin-to-Kernel Zero-Day

https://decoded.avast.io/janvojtesek/lazarus-and-the-fudmodule-rootkit-beyond-byovd-with-an-admin-to-kernel-zero-day/

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 96× in last 7d / 392× 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 1,412 total refreshes for this CVE.

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

Publicly available exploits

(10 references)

Working exploit code is in the public domain (8 GitHub PoCs) (2 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCMistyFir/CVE-2024-21338-Exploit
    First seen Mar 11, 2026
    Open source ↗
  • Exploit-DBEDB-52275
    First seen Apr 22, 2025

    Microsoft Windows 11 - Kernel Privilege Escalation

    Open source ↗
  • GitHub PoChackyboiz/kcfg-bypass
    First seen Jan 12, 2025

    kcfg bypass example - CVE-2024-21338

    Open source ↗
  • GitHub PoCCrowdfense/CVE-2024-21338
    First seen Jul 29, 2024

    Windows AppLocker Driver (appid.sys) LPE

    Open source ↗
  • GitHub PoCtykawaii98/CVE-2024-21338_PoC
    First seen Jun 23, 2024
    Open source ↗
  • GitHub PoCZombie-Kaiser/CVE-2024-21338-x64-build-
    First seen May 18, 2024

    Local Privilege Escalation from Admin to Kernel vulnerability on Windows 10 and Windows 11 operating systems with HVCI enabled.

    Open source ↗
  • GitHub PoCwusijie/CVE-2024-21338-1
    First seen May 5, 2024

    PoC for the Untrusted Pointer Dereference in the appid.sys driver

    Open source ↗
  • GitHub PoCUMU618/CVE-2024-21338
    First seen Apr 17, 2024

    Fork of https://github.com/hakaioffsec/CVE-2024-21338

    Open source ↗
  • GitHub PoChakaioffsec/CVE-2024-21338
    First seen Apr 13, 2024

    Local Privilege Escalation from Admin to Kernel vulnerability on Windows 10 and Windows 11 operating systems with HVCI enabled.

    Open source ↗
  • Exploit-DBEDB-51946
    First seen Apr 2, 2024

    Microsoft Windows 10.0.17763.5458 - Kernel Privilege Escalation

    Open source ↗

Frequently asked(6)

What is CVE-2024-21338?
CVE-2024-21338 is a critical vulnerability published on February 13, 2024. Windows Kernel Elevation of Privilege Vulnerability
When was CVE-2024-21338 disclosed?
CVE-2024-21338 was first published in the National Vulnerability Database on February 13, 2024, with the most recent update on August 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-21338 actively exploited?
Yes. CISA added CVE-2024-21338 to the Known Exploited Vulnerabilities catalog on March 4, 2024, affecting Microsoft Windows. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2024-21338?
CVE-2024-21338 has a CVSS v3 base score of 7.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2024-21338?
CVE-2024-21338 affects Microsoft Windows. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2024-21338?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-21338, 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-2024-21338

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