PT-2021-4438 · Microsoft · Windows

Erik Egsgard · CVE-2021-26442 · Published 2021-10-12 · Updated 2026-03-10

Positive Technologies (AI Summary)

CVSS v3.1

7.0

High

Base vector

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

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

Description The issue is related to an elevation-of-privilege vulnerability in the Windows HTTP.sys driver, which is associated with privilege management errors. Exploitation of this issue may allow an attacker to elevate their privileges.

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

Integer Overflow

Weakness Enumeration

CWE-190

CWE-264

Related Identifiers

BDU:2021-05068

BDU:2021-05069

CVE-2021-26442

Affected Products

Windows

References · 9

• https://bdu.fstec.ru/vul/2021-05069 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-26442 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26442 · Vendor Advisory
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26442 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-26442 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-05068 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26442 · Security Note
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2021-26442 · Vendor Advisory
• https://cybersecurity-help.cz/vdb/SB2021101213 · Note