Microsoft Win32k Privilege Escalation Vulnerability
Microsoft Win32k contains a privilege escalation vulnerability when the Windows kernel-mode driver fails to properly handle objects in memory. Successful exploitation allows an attacker to execute code in kernel mode.
- Vendor
- Microsoft
- Product
- Win32k
- CVSS
- 7.8
- EPSS (exploit probability)
- 53.9%
- Status
- kev
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2020-1054 being exploited?
Yes. CISA added CVE-2020-1054 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 53.9% (scored October 18, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-11-13. Full cross-catalog view: /kev-comparison
CVE-2020-1054 timeline
Every event links to its source. Catalog dates are each catalog's own; day offsets count from NVD publication. Data: JSON
What to do
CISA required actionApply updates per vendor instructions.
US federal civilian agencies must remediate by (181 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other Microsoft Win32k CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2016-0165 Microsoft Win32k Privilege Escalation Vulnerability | [ HIGH ] | 7.8 | 13.7% | |
| CVE-2023-29336 Microsoft Win32K Privilege Escalation Vulnerability | [ HIGH ] | 7.8 | 41.2% | |
| CVE-2015-2360 Microsoft Win32k Privilege Escalation Vulnerability | [ HIGH ] | 8.8 | 14.8% | |
| CVE-2018-8589 Microsoft Win32k Privilege Escalation Vulnerability | [ HIGH ] | 7.8 | 3.0% | |
| CVE-2014-4113 Microsoft Win32k Privilege Escalation Vulnerability | [ HIGH ] | 7.8 | 86.6% | |
| CVE-2021-41357 Microsoft Win32k Privilege Escalation Vulnerability | [ HIGH ] | 7.8 | 1.5% | |
| CVE-2021-40450 Microsoft Win32k Privilege Escalation Vulnerability | [ HIGH ] | 7.8 | 1.5% | |
| CVE-2013-3660 Microsoft Win32k Privilege Escalation Vulnerability | [ HIGH ] | 7.8 | 39.3% |