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Fencer Vulns
high 7.8

CVE-2026-34351 json

Windows TCP/IP Elevation of Privilege Vulnerability

published 2026-05-12 5 mo ago modified 2026-08-10 2 mo ago also EUVD-2026-29607

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 10%
public exploits
0
none known

Summary

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows TCP/IP allows an authorized attacker to elevate privileges locally.

Patch / fix

  • Microsoft Windows 10 Version 1607 10.0.14393.9140
  • Microsoft Windows 10 Version 1809 10.0.17763.8755
  • Microsoft Windows 10 Version 21H2 10.0.19044.7291
  • Microsoft Windows 10 Version 22H2 10.0.19045.7417
  • Microsoft Windows 11 version 23H2 10.0.22631.7079, 10.0.22631.7219
  • Microsoft Windows 11 Version 24H2 10.0.26100.8457
  • Microsoft Windows 11 Version 25H2 10.0.26200.8457
  • Microsoft Windows 11 version 26H1 10.0.28000.2113
  • Microsoft Windows Server 2012 6.2.9200.26079
  • Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.26079
  • Microsoft Windows Server 2012 R2 6.3.9600.23181
  • Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.23181
  • Microsoft Windows Server 2016 10.0.14393.9140
  • Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.9140
  • Microsoft Windows Server 2019 10.0.17763.8755
  • Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.8755
  • Microsoft Windows Server 2022 10.0.20348.5139
  • Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.2330
  • Microsoft Windows Server 2025 10.0.26100.32860
  • Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.32860

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
5 mo ago

Exploit prediction

0.21% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Microsoft Windows 10 Version 1607
  • Microsoft Windows 10 Version 1809
  • Microsoft Windows 10 Version 21H2
  • Microsoft Windows 10 Version 22H2
  • Microsoft Windows 11 version 23H2
  • Microsoft Windows 11 Version 24H2
  • Microsoft Windows 11 Version 25H2
  • Microsoft Windows 11 version 26H1
  • Microsoft Windows Server 2012
  • Microsoft Windows Server 2012 (Server Core installation)
  • Microsoft Windows Server 2012 R2
  • Microsoft Windows Server 2012 R2 (Server Core installation)
  • Microsoft Windows Server 2016
  • Microsoft Windows Server 2016 (Server Core installation)
  • Microsoft Windows Server 2019
  • Microsoft Windows Server 2019 (Server Core installation)
  • Microsoft Windows Server 2022
  • Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)
  • Microsoft Windows Server 2025
  • Microsoft Windows Server 2025 (Server Core installation)

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.