CVE DATABASE / CVE-2020-0638
CVE-2020-0638
Microsoft Update Notification Manager Privilege Escalation Vulnerability
CVSS 7.8 · HIGH
⚠ CISA KEV — ACTIVELY EXPLOITED
RANSOMWARE
On the CISA KEV catalog
Confirmed exploited in the wild. Added 2022-05-23.
Federal remediation due 2022-06-13.
Required action: Apply updates per vendor instructions.
Summary
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 3.1 breakdown
| Base score | 7.8 (HIGH) |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| Attack vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity | HIGH |
| Availability | HIGH |
Weakness type (CWE)
Affected products
Microsoft windows 10 1709Microsoft windows 10 1803Microsoft windows 10 1809Microsoft windows 10 1903Microsoft windows 10 1909Microsoft windows server 1803Microsoft windows server 1903Microsoft windows server 1909Microsoft windows server 2019
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References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0638
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-0638
Data: NIST NVD + CISA KEV. NVD last modified 2025-10-29. Always verify against the vendor advisory before acting.