PT-2025-36882 · Microsoft · Windows

Bryan De Houwer · Published 2025-09-09 · Updated 2026-03-01 · CVE-2025-54918

Positive Technologies (AI Summary)

CVSS v2.0

9.0

High

Base vector

AV:N/AC:L/Au:S/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions Windows NTLM versions prior to the fix included in CVE-2025-54918

Description An improper authentication issue exists within Windows NTLM. This flaw allows an authorized attacker to elevate privileges over a network. The vulnerability relates to deficiencies in the authentication procedure of the NTLM protocol. Exploitation may allow a remote attacker to elevate their privileges. The vulnerability allows for reflection of RPC to LDAPS from a standard user to a domain administrator. The issue was addressed by ensuring the Message Integrity Check (MIC) is always calculated, even if Type3 is empty.

Recommendations Apply the fix included in CVE-2025-54918.

Fix

LPE

Improper Authentication

Weakness Enumeration

CWE-287

Related Identifiers

BDU:2025-11053

CVE-2025-54918

Affected Products

Windows

References · 25

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-54918 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-54918 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-54918 · Security Note
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2025-54918 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-54918 · Vendor Advisory
• https://bdu.fstec.ru/vul/2025-11053 · Security Note
• https://crowdstrike.com/en-us/blog/analyzing-ntlm-ldap-authentication-bypass-vulnerability · Note
• https://twitter.com/decoder_it/status/1983127565544886651 · Twitter Post
• https://twitter.com/ksg93rd/status/1988972071683031414 · Twitter Post
• https://twitter.com/grok/status/1966216803811733879 · Twitter Post
• https://twitter.com/transilienceai/status/1965690753507610696 · Twitter Post
• https://reddit.com/r/CVEWatch/comments/1qjrne0/top_10_trending_cves_22012026 · Reddit Post
• https://roboshadow.com/blog/patch-tuesday-september-2025 · Reddit Post
• https://t.me/avleonovcom/1583 · Telegram Post
• https://twitter.com/decoder_it/status/1983852984938160245 · Twitter Post