CVE-2020-0638

HIGHNVD 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
7.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 3%CVSS: 7.8Exploit: NoneExposed: 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
86.1%
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 87× in last 7d / 372× 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 676 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2020-0638?
CVE-2020-0638 is a high 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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