CVE-2025-55696

Local privilege escalation via token-query race

Published Oct 14, 2025 · Updated Oct 14, 2025

TOCTOU race condition in NtQueryInformationToken in affected Microsoft Windows builds allows local users to elevate privileges. Microsoft identifies an untrusted-pointer dereference in the token-information path but does not disclose the checked object or the exact race sequence. Exploitation requires local authenticated access and can grant control over protected system resources.

CVSS severity7.8
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

TOCTOU race condition in NtQueryInformationToken in affected Microsoft Windows builds allows local users to elevate privileges. Microsoft identifies an untrusted-pointer dereference in the token-information path but does not disclose the checked object or the exact race sequence. Exploitation requires local authenticated access and can grant control over protected system resources.

The record

CVE
CVE-2025-55696
Published
Oct 14, 2025
Updated
Oct 14, 2025
Vendor
Microsoft
Product
Windows Server 2019
Classifications
CWE-367, CWE-822, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 14, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 14, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.17763.0 <10.0.17763.7919

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Microsoft · Windows Server 2019version=10.0.17763.0 <10.0.17763.7919
Microsoft · Windows Server 2025 (Server Core installation)version=10.0.26100.0 <10.0.26100.6899
Microsoft · Windows 11, version 25H2version=10.0.26200.0 <10.0.26200.6899
Microsoft · Windows 11, version 24H2version=10.0.26100.0 <10.0.26100.6899
Microsoft · Windows 10 Version 21H2version=10.0.19044.0 <10.0.19044.6456
Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)version=10.0.25398.0 <10.0.25398.1913
Microsoft · Windows 11 Version 22H3version=10.0.22631.0 <10.0.22631.6060
Microsoft · Windows 10 Version 22H2version=10.0.19045.0 <10.0.19045.6456
Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.7919
Microsoft · Windows 11 Version 23H2version=10.0.22631.0 <10.0.22631.6060
Microsoft · Windows 11, version 22H2version=10.0.22621.0 <10.0.22621.6060
Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.4294
Microsoft · Windows Server 2025version=10.0.26100.0 <10.0.26100.6899
Microsoft · Windows 10 Version 1809version=10.0.17763.0 <10.0.17763.7919

Published CVSS scores

7.0NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8Microsoft CorporationCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
CWE-822Untrusted Pointer Dereference
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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