CVE-2021-1732: Microsoft Win32k Privilege Escalation Vulnerability
Vulnerability summary
CVE-2021-1732 is a high (CVSS 7.8) Out-of-bounds Write vulnerability in Microsoft Win32k. It is known to be exploited: CISA lists it, first on 03-11-2021. It has been used in ransomware campaigns. EPSS estimates a 78.38% chance of exploitation in the next 30 days, higher than 99.5% of scored vulnerabilities. 3 public exploits are recorded.
Timeline
- 25-02-2021PublishedVulnerability first disclosed.
- 03-11-2021Added to CISA KEVMicrosoft Win32k Privilege Escalation Vulnerability
- 17-11-2021CISA remediation dueApply updates per vendor instructions.
- 12-08-2026Last modifiedVulnerability information updated.
Description
Windows Win32k Elevation of Privilege Vulnerability
CVSS metrics
3 scores · 2 sources · 2 versions- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
78.38%
Chance of exploitation in the next 30 days
Percentile
100%
Versus all other CVEs
30-day change
0.00 pp
From 78.38% on 19-09-2026
Known exploited
Compare KEV catalogs
CISA KEVListed- Added
- 03-11-2021
- Federal due date
- 17-11-2021
CISA required action
Apply updates per vendor instructions. nvd.nist.gov/vuln/detail/CVE-2021-1732
Public exploits
3 foundExploit Reference (packetstormsecurity.com)
Maturity: unknown
Exploit Reference (packetstormsecurity.com)
Maturity: unknown
Win32k ConsoleControl Offset Confusion
exploit/windows/local/cve_2022_21882_win32k
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Microsoft18 products
1 vendor · 18 products
References
4 links
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1732X Refsource MISCPatchVendor Advisory- packetstormsecurity.com/files/161880/Win32k-ConsoleControl-Offset-Confusion.htmlX Refsource MISCExploitThird Party AdvisoryVDB Entry
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1732Government ResourceUS Government Resource