OnlyFm252
Windows Web Threat Defense User Service

CVE-2025-21343 — Windows Web Threat Defense User Service Information Disclosure Vulnerability

Important CVSS 7.5 EPSS 0.01299 2025-01 archive

Executive Summary

None

Overview

7.5
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Information Disclosure
Released Jan 14 2025
Last Updated Jan 14 2025
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.01299 — 0.66666 percentile
NVD CVSS 7.5 HIGH — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
None
AVAILABILITY
None
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.5

EPSS Score

0.01299
probability of exploitation in the next 30 days
0.66666 percentile - updated 2026-06-21
View on FIRST.org

Affected Products

6 affected products
Product KB Article Severity Impact Restart Required
Windows 11 Version 22H2 for ARM64-based Systems 5050021 (Security Update) Important Information Disclosure Yes
Windows 11 Version 22H2 for x64-based Systems 5050021 (Security Update) Important Information Disclosure Yes
Windows 11 Version 23H2 for ARM64-based Systems 5050021 (Security Update) Important Information Disclosure Yes
Windows 11 Version 23H2 for x64-based Systems 5050021 (Security Update) Important Information Disclosure Yes
Windows 11 Version 24H2 for ARM64-based Systems 5050009 (Security Update) Important Information Disclosure Yes
Windows 11 Version 24H2 for x64-based Systems 5050009 (Security Update) Important Information Disclosure Yes

Patches

2 patches
Article Type Restart
5050021 Security Update Yes
5050009 Security Update Yes

Known Exploits

On This Page