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Fencer Vulns
medium 5.9

CVE-2026-70091 json

Windows DNS Denial of Service Vulnerability

published 2026-09-08 2 mo ago modified 2026-10-31 8 d ago also EUVD-2026-73171

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 51%
public exploits
0
none known

Summary

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows DNS allows an unauthorized attacker to deny service over a network.

Patch / fix

  • Microsoft Windows 10 Version 1607 10.0.14393.9512
  • Microsoft Windows 10 Version 1809 10.0.17763.9245
  • Microsoft Windows Server 2012 6.2.9200.26349
  • Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.26349
  • Microsoft Windows Server 2012 R2 6.3.9600.23398
  • Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.23398
  • Microsoft Windows Server 2016 10.0.14393.9512
  • Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.9512
  • Microsoft Windows Server 2019 10.0.17763.9245
  • Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.9245
  • Microsoft Windows Server 2022 10.0.20348.5622
  • Microsoft Windows Server 2025 10.0.26100.33438
  • Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.33438

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.66% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Microsoft Windows 10 Version 1607
  • Microsoft Windows 10 Version 1809
  • 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 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.