CVE-2021-36942

HIGHNVD 7.59.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 7.5 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
7.5
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 66%CVSS: 7.5Exploit: NoneExposed: 0

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

Windows LSA Spoofing Vulnerability

CVSS v3
7.5
EG Score
9.0(high)
EPSS
99.2%
KEV
⚠ Exploited

Published

August 12, 2021

Last Modified

October 30, 2025

Advisory Details (3)

Auto-updated Jun 4, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: microsoft, cert, 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-2021-36942
cert

VU#405600 - Microsoft Windows Active Directory Certificate Services can allow for AD compromise via PetitPotam NTLM relay attacks

https://www.kb.cert.org/vuls/id/405600
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

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

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-36942

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 102× in last 7d / 418× 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 723 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

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

  • Metasploitauxiliary/scanner/dcerpc/petitpotam✓ verified
    First seen Jan 1, 2021

    PetitPotam

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(6)

What is CVE-2021-36942?
CVE-2021-36942 is a high vulnerability published on August 12, 2021. Windows LSA Spoofing Vulnerability
When was CVE-2021-36942 disclosed?
CVE-2021-36942 was first published in the National Vulnerability Database on August 12, 2021, with the most recent update on October 30, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-36942 actively exploited?
Yes. CISA added CVE-2021-36942 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Microsoft Windows. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2021-36942?
CVE-2021-36942 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2021-36942?
CVE-2021-36942 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-2021-36942?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-36942, 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-2021-36942

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