CVEs / CVE-2021-36948
CVE-2021-36948: Microsoft Windows Update Medic Service Privilege Escalation Vulnerability
- Known exploited in the CISA KEV catalog since 3 Nov 2021
- medium 4.6 CVSS 2.0 (NVD)
- EPSS 23.2% chance of exploitation in the next 30 days, higher than 97% of CVEs (30 Oct 2026)
- Last changed at its sources
Are you affected? Check your servers with Stackurity: it lists the software on each server and the vulnerabilities to fix first.
Check your servers with Stackurity Already using Stackurity? Search for CVE-2021-36948
Summary
Microsoft Windows Update Medic Service contains an unspecified vulnerability that allows for privilege escalation.
Description
Windows Update Medic Service Elevation of Privilege Vulnerability
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| Microsoft Windows 10 Version 1809 | from 10.0.17763.0, before 10.0.17763.2114 | 10.0.17763.2114 |
| Microsoft Windows 10 Version 1809 | from 10.0.0, before 10.0.17763.2114 | 10.0.17763.2114 |
| Microsoft Windows 10 Version 1909 | from 10.0.0, before 10.0.18363.1734 | 10.0.18363.1734 |
| Microsoft Windows 10 Version 2004 | from 10.0.0, before 10.0.19041.1165 | 10.0.19041.1165 |
| Microsoft Windows 10 Version 20H2 | from 10.0.0, before 10.0.19042.1165 | 10.0.19042.1165 |
| Microsoft Windows 10 Version 21H1 | from 10.0.0, before 10.0.19043.1165 | 10.0.19043.1165 |
| Microsoft Windows Server 2019 | from 10.0.17763.0, before 10.0.17763.2114 | 10.0.17763.2114 |
| Microsoft Windows Server 2019 (Server Core installation) | from 10.0.17763.0, before 10.0.17763.2114 | 10.0.17763.2114 |
| Microsoft Windows Server version 2004 | from 10.0.0, before 10.0.19041.1165 | 10.0.19041.1165 |
| Microsoft Windows Server version 20H2 | from 10.0.0, before 10.0.19042.1165 | 10.0.19042.1165 |
Exploitation
| In CISA KEV since | 3 Nov 2021 |
|---|---|
| Due date for US federal agencies | 17 Nov 2021 |
| Used in ransomware campaigns | Unknown |
| Required action | Apply updates per vendor instructions. |
Severity
| CVSS 2.0 | 4.6 mediumAV:L/AC:L/Au:N/C:P/I:P/A:PScored by NVD |
|---|
References
- CVE-2021-36948 on NVD
- CVE-2021-36948 in the CISA KEV catalog
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36948 Patch, Vendor Advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-36948 Patch, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-36948 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.