CVE-2021-36942

CRITICALNVD 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
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 66%CVSS: 7.5Exploit: cisa kev · ssvc active · kev ransomware · 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.

Windows LSA Spoofing Vulnerability

CVSS v3
7.5
EG Score
9.0(high)
EG Risk
96(Act)
EG Risk 96/100SSVC: Act

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%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS PROB
66%
EPSS %ILE
99%
KEV
⚠ Exploited

Published

August 12, 2021

Last Modified

August 10, 2026

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

Vendor Advisories for CVE-2021-36942(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

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 105× in last 7d / 426× 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 1,510 total refreshes for this CVE.

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

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 critical 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 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-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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