PT-2021-3923 · Microsoft · Windows Kernel+1

Published 2021-07-13 · Updated 2025-10-29 · CVE-2021-33771

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Windows Kernel (affected versions not specified)

Description The issue is related to an elevation of privilege vulnerability in the Windows Kernel, which is caused by insecure privilege management. Exploitation of this issue may allow an attacker to elevate their privileges. There is no information provided about the estimated number of potentially affected devices worldwide or real-world incidents where this issue was exploited.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

LPE

Buffer Overflow

Improper Privilege Management

Weakness Enumeration

CWE-119

CWE-269

Related Identifiers

BDU:2021-04440

CVE-2021-33771

Affected Products

Windows

Windows Kernel

References · 15

• https://bdu.fstec.ru/vul/2021-04440 · Security Note
• https://osv.dev/vulnerability/CVE-2021-33771 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-33771 · Vendor Advisory
• https://safe-surf.ru/specialists/bulletins-nkcki/667112 · Security Note
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33771 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-33771 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-33771 · Security Note
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2021-33771 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-33771 · Vendor Advisory
• https://cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33771 · Note
• https://t.me/cibsecurity/26158 · Telegram Post
• https://t.me/cvenotify/17610 · Telegram Post
• https://t.me/cveNotify/140864 · Telegram Post
• https://t.me/cvenotify/87602 · Telegram Post
• https://cisa.gov/known-exploited-vulnerabilities-catalog · Note