Advisoriesby IbisMicrosoftCVE-2026-85321
Microsoft Windows Server: resource exhaustion
Fix: upgrade to 6.3.9600.23470 or later (5 fixed versions below)
Allocation of resources without limits or throttling in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service over a network.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Windows Server 2012 R2 Product | >= 6.3.9600.0, < 6.3.9600.23470 | 6.3.9600.23470 |
| Windows Server 2012 R2 (Server Core installation) Product | >= 6.3.9600.0, < 6.3.9600.23470 | 6.3.9600.23470 |
| Windows Server 2016 Product | >= 10.0.14393.0, < 10.0.14393.9612 | 10.0.14393.9612 |
| Windows Server 2016 (Server Core installation) Product | >= 10.0.14393.0, < 10.0.14393.9612 | 10.0.14393.9612 |
| Windows Server 2019 Product | >= 10.0.17763.0, < 10.0.17763.9376 | 10.0.17763.9376 |
| Windows Server 2019 (Server Core installation) Product | >= 10.0.17763.0, < 10.0.17763.9376 | 10.0.17763.9376 |
| Windows Server 2022 Product | >= 10.0.20348.0, < 10.0.20348.5761 | 10.0.20348.5761 |
| Windows Server 2025 Product | >= 10.0.26100.0, < 10.0.26100.33650 | 10.0.26100.33650 |
| Windows Server 2025 (Server Core installation) Product | >= 10.0.26100.0, < 10.0.26100.33650 | 10.0.26100.33650 |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-770