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Fencer Intel
high 7.5

CVE-2026-85321 json

Active Directory Federation Services (AD FS) Denial of Service Vulnerability

published 29d ago modified yesterday also EUVD-2026-99461

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 64%
public exploits
0
none known

Summary

Allocation of resources without limits or throttling in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service over a network.

Patch / fix

  • Microsoft Windows Server 2012 R2 6.3.9600.23470
  • Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.23470
  • Microsoft Windows Server 2016 10.0.14393.9612
  • Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.9612
  • Microsoft Windows Server 2019 10.0.17763.9376
  • Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.9376
  • Microsoft Windows Server 2022 10.0.20348.5761
  • Microsoft Windows Server 2025 10.0.26100.33650
  • Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.33650

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CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
29d ago

Exploit prediction

1.03% chance of exploitation in the next 30 days, higher than 64% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • 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-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Intel 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.