CVE-2020-0638

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 2022-05-23), 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: 3%CVSS: 7.8Exploit: cisa kev · ssvc active · kev ransomwareExposed: 0

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

An elevation of privilege vulnerability exists in the way the Update Notification Manager handles files.To exploit this vulnerability, an attacker would first have to gain execution on the victim system, aka 'Update Notification Manager 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
3%
EPSS %ILE
86%
KEV
⚠ Exploited

Published

January 14, 2020

Last Modified

October 29, 2025

Advisory Details (2)

Auto-updated Jun 3, 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-2020-0638
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-2020-0638

Weakness Classification(2)

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 63× in last 7d / 351× 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 711 total refreshes for this CVE.

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

Frequently asked(6)

What is CVE-2020-0638?
CVE-2020-0638 is a critical vulnerability published on January 14, 2020. An elevation of privilege vulnerability exists in the way the Update Notification Manager handles files.To exploit this vulnerability, an attacker would first have to gain execution on the victim system, aka 'Update Notification Manager Elevation of Privilege Vulnerability'.
When was CVE-2020-0638 disclosed?
CVE-2020-0638 was first published in the National Vulnerability Database on January 14, 2020, with the most recent update on October 29, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-0638 actively exploited?
Yes. CISA added CVE-2020-0638 to the Known Exploited Vulnerabilities catalog on May 23, 2022, affecting Microsoft Update Notification Manager. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2020-0638?
CVE-2020-0638 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-2020-0638?
CVE-2020-0638 affects Microsoft Update Notification Manager. 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-2020-0638?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-0638, 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.

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