PT-2026-2700 · Microsoft · Windows

Howard Mcgreehan · Published 2026-01-13 · Updated 2026-02-16 · CVE-2026-20854

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

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

Description A use after free condition exists in the Windows Local Security Authority Subsystem Service (LSASS). This allows an authorized attacker to execute code over a network. Remote attackers can execute arbitrary code and affect the system. The vulnerability involves the use of memory after it has been freed.

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

RCE

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

BDU:2026-00395

CVE-2026-20854

Affected Products

Windows

References · 13

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20854 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-20854 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-00395 · Security Note
• https://osv.dev/vulnerability/CVE-2026-20854 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-20854 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-20854 · Security Note
• https://twitter.com/lsof/status/2013982052689789185 · Twitter Post
• https://twitter.com/ThreatSynop/status/2011355945075388698 · Twitter Post
• https://twitter.com/ThreatSynop/status/2011165017211560260 · Twitter Post
• https://twitter.com/TTheBattlefield/status/2012037669560221759 · Twitter Post
• https://twitter.com/ThreatSynop/status/2011448508906123721 · Twitter Post
• https://twitter.com/CVEnew/status/2011181521340940321 · Twitter Post
• https://twitter.com/vuldb/status/2011157098449780806 · Twitter Post