CVE-2021-42292

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 2021-11-17), 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
7.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 32%CVSS: 7.8Exploit: NoneExposed: 0

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

Microsoft Excel Security Feature Bypass 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
32%
EPSS %ILE
98%
KEV
⚠ Exploited

Published

November 10, 2021

Last Modified

October 30, 2025

Advisory Details (2)

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-2021-42292
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-2021-42292

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 68× in last 7d / 400× 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 790 total refreshes for this CVE.

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

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 PoCcorelight/CVE-2021-42292
    First seen Nov 9, 2021

    A Zeek package to detect CVE-2021-42292, a Microsoft Excel local privilege escalation exploit.

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(6)

What is CVE-2021-42292?
CVE-2021-42292 is a high vulnerability published on November 10, 2021. Microsoft Excel Security Feature Bypass Vulnerability
When was CVE-2021-42292 disclosed?
CVE-2021-42292 was first published in the National Vulnerability Database on November 10, 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-2021-42292 actively exploited?
Yes. CISA added CVE-2021-42292 to the Known Exploited Vulnerabilities catalog on November 17, 2021, affecting Microsoft Office. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2021-42292?
CVE-2021-42292 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-2021-42292?
CVE-2021-42292 affects Microsoft Office. 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-2021-42292?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-42292, 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-2021-42292

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