PT-2021-3811 · Microsoft · Malware Protection Engine+1

Abdelhamid Naceri + 1 · Published 2021-05-05 · Updated 2023-12-28 · CVE-2021-34471

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 Microsoft Malware Protection Engine (MPE) (affected versions not specified) Microsoft Windows Defender (affected versions not specified)

Description The issue is related to insufficient access control in the Microsoft Malware Protection Engine (MPE), which can be exploited to elevate privileges or cause a denial of service.

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

LPE

Improper Privilege Management

Weakness Enumeration

CWE-264

CWE-269

Related Identifiers

BDU:2021-04121

CVE-2021-34471

ZDI-21-962

Affected Products

Malware Protection Engine

Windows Defender

References · 6

• https://zerodayinitiative.com/advisories/ZDI-21-962 · Security Note
• https://osv.dev/vulnerability/CVE-2021-34471 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34471 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-04121 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-34471 · Security Note
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34471 · Vendor Advisory