Actively exploited · Published Jun 8, 2021 · Assigned by microsoft
CVE-2021-31955Windows Kernel Information Disclosure Vulnerability
Medium 5.5 Exploited
In plain English
A medium-severity security flaw in Windows 10 Version 1809 from Microsoft. Attackers are actively exploiting it in the wild (listed by CISA on November 3, 2021). The chance it is exploited in the next 30 days is estimated at 81.1% (higher than 99.6% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Apply updates per vendor instructions.
Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)81.1%top 0.4% of all CVEs
Exploited in the wildYesCISA KEV since Nov 3, 2021
Attack tooling1Public PoC
CISA guidance
Apply updates per vendor instructions.
Federal agencies must remediate by Nov 17, 2021.
Official description
Windows Kernel Information Disclosure Vulnerability
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 10 Version 1809 | 10.0.0 – before 10.0.17763.1999 |
| Microsoft | Windows Server 2019 | 10.0.0 – before 10.0.17763.1999 |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.0 – before 10.0.17763.1999 |
| Microsoft | Windows 10 Version 1909 | 10.0.0 – before 10.0.18363.1621 |
| Microsoft | Windows 10 Version 21H1 | 10.0.0 – before 10.0.19043.1052 |
| Microsoft | Windows 10 Version 2004 | 10.0.0 – before 10.0.19041.1052 |
| Microsoft | Windows Server version 2004 | 10.0.0 – before 10.0.19041.1052 |
| Microsoft | Windows 10 Version 20H2 | 10.0.0 – before 10.0.19042.1052 |
| Microsoft | Windows Server version 20H2 | 10.0.0 – before 10.0.19042.1052 |
Weakness: CWE-497 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C