CVE-2021-40449

high

Description

Win32k Elevation of Privilege Vulnerability

From the Tenable Blog

Microsoft’s October 2021 Patch Tuesday Addresses 74 CVEs (CVE-2021-40449)

Published: 2021-10-12

Microsoft addresses 74 CVEs in its October 2021 Patch Tuesday release, including another Print Spooler flaw and a zero-day vulnerability in Win32k that was exploited in the wild.

References

https://www.edgescan.com/wp-content/uploads/2024/03/2023-Vulnerability-Statistics-Report.pdf

https://www.bleepingcomputer.com/news/security/chinese-hackers-target-russian-govt-with-upgraded-rat-malware/

https://securelist.com/mysterysnail-new-version/116226/

https://securelist.com/updated-mata-attacks-industrial-companies-in-eastern-europe/110829/

https://www.tenable.com/cyber-exposure/a-look-inside-the-ransomware-ecosystem

https://www.tenable.com/cyber-exposure/2021-threat-landscape-retrospective

https://web.archive.org/web/20211025233339/https://twitter.com/pancak3lullz/status/1452679527197560837

https://www.tenable.com/blog/microsofts-june-2024-patch-tuesday-addresses-49-cves

https://www.tenable.com/blog/microsofts-may-2023-patch-tuesday-addresses-38-cves-cve-2023-29336

https://www.tenable.com/blog/microsoft-s-october-2021-patch-tuesday-addresses-74-cves-cve-2021-40449

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40449

http://packetstormsecurity.com/files/164926/Win32k-NtGdiResetDC-Use-After-Free-Local-Privilege-Escalation.html

Details

Source: Mitre, NVD

Published: 2021-10-13

Updated: 2025-03-13

Named Vulnerability: MysterySnailKnown Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 4.6

Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P

Severity: Medium

CVSS v3

Base Score: 7.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Severity: High

EPSS

EPSS: 0.85095

Detections

Analytics