Windows Server 2025 vulnerabilitiesAnd the versions its exploited flaws hit.
Windows Server 2025 is made by Microsoft. We track 549 published vulnerabilities in it, across 29 versions. 29 of them are on the list of flaws known to be exploited, the newest added on 8 September 2026. If you run Windows Server 2025, check your version against the exploited flaws below and patch those first.
The most recent Windows Server 2025 flaw added to the known-exploited list is CVE-2026-81963, on 8 September 2026. We keep watching the known-exploited list.
Which versions of Windows Server 2025 do the exploited flaws hit?
Each exploited flaw lists the versions it affects, usually as ranges. "before 10.0.26100.33438" means every version up to, but not including, 10.0.26100.33438. Find your version, then patch.
- CVE-2026-81963Exploited list, 8 Sep 2026
Microsoft Windows Link Following Vulnerability
before 10.0.26100.33438 - CVE-2026-56155Exploited list, 14 Jul 2026
Microsoft Active Directory Federation Services Insufficient Granularity of Access Control Vulnerability
before 10.0.26100.33158 - CVE-2025-59287Exploited list, 24 Oct 2025
Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data Vulnerability
before 10.0.26100.6905 - CVE-2025-33073Exploited list, 20 Oct 2025
Microsoft Windows SMB Client Improper Access Control Vulnerability
before 10.0.26100.4270 - CVE-2025-24990Exploited list, 14 Oct 2025
Microsoft Windows Untrusted Pointer Dereference Vulnerability
up to 10.0.26100.6899 - CVE-2025-59230Exploited list, 14 Oct 2025
Microsoft Windows Improper Access Control Vulnerability
up to 10.0.26100.6899 - CVE-2025-47827Exploited list, 14 Oct 2025
IGEL OS Use of a Key Past its Expiration Date Vulnerability
before 10.0.26100.6899 - CVE-2025-33053Exploited list, 10 Jun 2025
Microsoft Windows External Control of File Name or Path Vulnerability
before 10.0.26100.4349 - CVE-2025-30400Exploited list, 13 May 2025
Microsoft Windows DWM Core Library Use-After-Free Vulnerability
before 10.0.26100.4061 - CVE-2025-30397Exploited list, 13 May 2025
Microsoft Windows Scripting Engine Type Confusion Vulnerability
before 10.0.26100.4061 - CVE-2025-32706Exploited list, 13 May 2025
Microsoft Windows Common Log File System (CLFS) Driver Heap-Based Buffer Overflow Vulnerability
before 10.0.26100.4061 - CVE-2025-32701Exploited list, 13 May 2025
Microsoft Windows Common Log File System (CLFS) Driver Use-After-Free Vulnerability
before 10.0.26100.4061 - CVE-2025-32709Exploited list, 13 May 2025
Microsoft Windows Ancillary Function Driver for WinSock Use-After-Free Vulnerability
before 10.0.26100.4061 - CVE-2025-24054Exploited list, 17 Apr 2025
Microsoft Windows NTLM Hash Disclosure Spoofing Vulnerability
before 10.0.26100.3403 - CVE-2025-29824Exploited list, 8 Apr 2025
Microsoft Windows Common Log File System (CLFS) Driver Use-After-Free Vulnerability
before 10.0.26100.3775 - CVE-2025-24993Exploited list, 11 Mar 2025
Microsoft Windows NTFS Heap-Based Buffer Overflow Vulnerability
before 10.0.26100.3403 - CVE-2025-24984Exploited list, 11 Mar 2025
Microsoft Windows NTFS Information Disclosure Vulnerability
before 10.0.26100.3476 - CVE-2025-24985Exploited list, 11 Mar 2025
Microsoft Windows Fast FAT File System Driver Integer Overflow Vulnerability
before 10.0.26100.3476 - CVE-2025-24991Exploited list, 11 Mar 2025
Microsoft Windows NTFS Out-Of-Bounds Read Vulnerability
before 10.0.26100.3403 - CVE-2025-26633Exploited list, 11 Mar 2025
Microsoft Windows Management Console (MMC) Improper Neutralization Vulnerability
before 10.0.26100.3403 - CVE-2025-21418Exploited list, 11 Feb 2025
Microsoft Windows Ancillary Function Driver for WinSock Heap-Based Buffer Overflow Vulnerability
before 10.0.26100.3194 - CVE-2025-21391Exploited list, 11 Feb 2025
Microsoft Windows Storage Link Following Vulnerability
before 10.0.26100.3194 - CVE-2025-21335Exploited list, 14 Jan 2025
Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free Vulnerability
before 10.0.26100.2894 - CVE-2025-21334Exploited list, 14 Jan 2025
Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free Vulnerability
before 10.0.26100.2894 - CVE-2025-21333Exploited list, 14 Jan 2025
Microsoft Windows Hyper-V NT Kernel Integration VSP Heap-based Buffer Overflow Vulnerability
before 10.0.26100.2894 - CVE-2024-49138Exploited list, 10 Dec 2024
Microsoft Windows Common Log File System (CLFS) Driver Heap-Based Buffer Overflow Vulnerability
before 10.0.26100.2605 - CVE-2024-43451Exploited list, 12 Nov 2024
Microsoft Windows NTLMv2 Hash Disclosure Spoofing Vulnerability
before 10.0.26100.2314 - CVE-2024-49039Exploited list, 12 Nov 2024
Microsoft Windows Task Scheduler Privilege Escalation Vulnerability
before 10.0.26100.2314
1 more exploited flaw names Windows Server 2025 without a version of its own, for example as the system other affected software runs on. It is in the list below.
Which Windows Server 2025 vulnerabilities are being exploited?
29 flaws are on the government list of vulnerabilities known to be exploited. These are the ones criminals are using now, so they go first, whatever their severity score says.
- 7.8Microsoft Windows Link Following Vulnerability
Microsoft Windows Update Stack contains a link following vulnerability that allows a local attacker to escalate privileges locally up to SYSTEM.
- 7.8Microsoft Active Directory Federation Services Insufficient Granularity of Access Control Vulnerability
Microsoft Active Directory Federation Services contains an insufficient granularity of access control vulnerability that allows an authorized attacker to elevate privileges locally.
- 9.8Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data Vulnerability
Microsoft Windows Server Update Service (WSUS) contains a deserialization of untrusted data vulnerability that allows for remote code execution.
- 8.8Microsoft Windows SMB Client Improper Access Control Vulnerability
Microsoft Windows SMB Client contains an improper access control vulnerability that could allow for privilege escalation.
- 7.8Microsoft Windows Untrusted Pointer Dereference Vulnerability
Microsoft Windows Agere Modem Driver contains an untrusted pointer dereference vulnerability that allows for privilege escalation.
- 7.8Microsoft Windows Improper Access Control Vulnerability
Microsoft Windows contains an improper access control vulnerability in Windows Remote Access Connection Manager which could allow an authorized attacker to elevate privileges locally.
- 4.6IGEL OS Use of a Key Past its Expiration Date Vulnerability
IGEL OS contains a use of a key past its expiration date vulnerability that allows for Secure Boot bypass.
- 8.8Microsoft Windows External Control of File Name or Path Vulnerability
Microsoft Windows contains an external control of file name or path vulnerability that could allow an attacker to execute code from a remote WebDAV location specified by the WorkingDirectory attribute of Internet...
Which Windows Server 2025 flaws are most likely to be used?
Ranked by the latest exploit-likelihood forecast: the chance each flaw is used in an attack in the next 30 days. A high severity score on its own doesn't tell you that. Flaws shared by many other makers' products are left out.
- >99%
Deserialization of untrusted data in Windows Server Update Service allows an unauthorized attacker to execute code over a network.
- 87%
External control of file name or path in Internet Shortcut Files allows an unauthorized attacker to execute code over a network.
- 85%
NTLM Hash Disclosure Spoofing Vulnerability
- 84%CVE-2024-49113High
Windows Lightweight Directory Access Protocol (LDAP) Denial of Service Vulnerability
- 83%
Improper access control in Windows SMB allows an authorized attacker to elevate privileges over a network.
- 81%CVE-2025-21298Critical
Windows OLE Remote Code Execution Vulnerability
- 72%CVE-2024-49112Critical
Windows Lightweight Directory Access Protocol (LDAP) Remote Code Execution Vulnerability
- 63%CVE-2024-43642High
Windows SMB Denial of Service Vulnerability
- 62%
External control of file name or path in Windows NTLM allows an unauthorized attacker to perform spoofing over a network.
- 56%CVE-2025-21285High
Microsoft Message Queuing (MSMQ) Denial of Service Vulnerability
Running Windows Server 2025? We'll keep checking.
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1 flaw being exploited affects software Acme tracks
Microsoft Windows Update Stack contains a link following vulnerability that allows a local attacker to escalate privileges locally up to SYSTEM.
- Matched to
- Windows Server 2025 on Acme's software list
- What to do
- Patch first, then check for signs of use
Sent to the alert recipients Acme chose. Also in the app and to Acme's webhook.
We track 549 published vulnerabilities listed under the name Windows Server 2025, across 29 versions. The most recent Windows Server 2025 flaw added to the known-exploited list is CVE-2026-81963, on 8 September 2026.
29 are on the list of flaws known to be exploited. The most recently added are CVE-2026-81963, CVE-2026-56155 and CVE-2025-59287.
Each flaw names its own versions, usually as ranges. The newest, CVE-2026-81963, affects before 10.0.26100.33438. The versions for every exploited flaw are listed on this page.
Create a Precursor Intelligence account and track Windows Server 2025. We match it against every published flaw, give each one a risk score from 0 to 100 and keep watching, so you hear about new ones as soon as we know, by email, in the app or by webhook.