PT-2026-2670 · Microsoft · Windows

0Rb1T𝕏 · Published 2026-01-13 · Updated 2026-04-06 · CVE-2026-20820

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 versions (affected versions not specified)

Description A heap-based buffer overflow exists in the Windows Common Log File System Driver. Exploitation of this issue can allow an authorized attacker to elevate privileges locally. The issue allows attackers to affect the system and potentially gain elevated access.

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

Heap Based Buffer Overflow

Weakness Enumeration

CWE-122

Related Identifiers

BDU:2026-00571

CVE-2026-20820

Affected Products

Windows

References · 12

• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-20820 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20820 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-20820 · Security Note
• https://bdu.fstec.ru/vul/2026-00571 · Security Note
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-20820 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-20820 · Vendor Advisory
• https://twitter.com/vuln_tracker/status/2030137975762473379 · Twitter Post
• https://twitter.com/rouge_cravate/status/2029830903497908576 · Twitter Post
• https://twitter.com/blueteamsec1/status/2041175995915677867 · Twitter Post
• https://twitter.com/ksg93rd/status/2032301203279810996 · Twitter Post
• https://twitter.com/CVEnew/status/2012490420660420639 · Twitter Post
• https://twitter.com/vuldb/status/2011143349118648599 · Twitter Post