# Windows Server 2025 vulnerabilities

> 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.

Canonical page: https://www.precursorintelligence.com/product/microsoft/windows_server_2025

## At a glance

- **Made by:** [Microsoft](https://www.precursorintelligence.com/vendors/microsoft)
- **Published vulnerabilities:** 549
- **Known to be exploited:** 29
- **Versions tracked:** 29
- **Most recently added to the known-exploited list:** [CVE-2026-81963](https://www.precursorintelligence.com/what-is/cve-2026-81963), 8 September 2026. We keep watching the list.

## Which versions of Windows Server 2025 do the exploited flaws hit?

Each exploited flaw lists the versions it affects, as published. "before 10.0.26100.33438" means every version up to, but not including, 10.0.26100.33438.

- [CVE-2026-81963](https://www.precursorintelligence.com/what-is/cve-2026-81963) (Microsoft Windows Link Following Vulnerability): before 10.0.26100.33438
- [CVE-2026-56155](https://www.precursorintelligence.com/what-is/cve-2026-56155) (Microsoft Active Directory Federation Services Insufficient Granularity of Access Control Vulnerability): before 10.0.26100.33158
- [CVE-2025-59287](https://www.precursorintelligence.com/what-is/cve-2025-59287) (Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data Vulnerability): before 10.0.26100.6905
- [CVE-2025-33073](https://www.precursorintelligence.com/what-is/cve-2025-33073) (Microsoft Windows SMB Client Improper Access Control Vulnerability): before 10.0.26100.4270
- [CVE-2025-24990](https://www.precursorintelligence.com/what-is/cve-2025-24990) (Microsoft Windows Untrusted Pointer Dereference Vulnerability): up to 10.0.26100.6899
- [CVE-2025-59230](https://www.precursorintelligence.com/what-is/cve-2025-59230) (Microsoft Windows Improper Access Control Vulnerability): up to 10.0.26100.6899
- [CVE-2025-47827](https://www.precursorintelligence.com/what-is/cve-2025-47827) (IGEL OS Use of a Key Past its Expiration Date Vulnerability): before 10.0.26100.6899
- [CVE-2025-33053](https://www.precursorintelligence.com/what-is/cve-2025-33053) (Microsoft Windows External Control of File Name or Path Vulnerability): before 10.0.26100.4349
- [CVE-2025-30400](https://www.precursorintelligence.com/what-is/cve-2025-30400) (Microsoft Windows DWM Core Library Use-After-Free Vulnerability): before 10.0.26100.4061
- [CVE-2025-30397](https://www.precursorintelligence.com/what-is/cve-2025-30397) (Microsoft Windows Scripting Engine Type Confusion Vulnerability): before 10.0.26100.4061
- [CVE-2025-32706](https://www.precursorintelligence.com/what-is/cve-2025-32706) (Microsoft Windows Common Log File System (CLFS) Driver Heap-Based Buffer Overflow Vulnerability): before 10.0.26100.4061
- [CVE-2025-32701](https://www.precursorintelligence.com/what-is/cve-2025-32701) (Microsoft Windows Common Log File System (CLFS) Driver Use-After-Free Vulnerability): before 10.0.26100.4061
- [CVE-2025-32709](https://www.precursorintelligence.com/what-is/cve-2025-32709) (Microsoft Windows Ancillary Function Driver for WinSock Use-After-Free Vulnerability): before 10.0.26100.4061
- [CVE-2025-24054](https://www.precursorintelligence.com/what-is/cve-2025-24054) (Microsoft Windows NTLM Hash Disclosure Spoofing Vulnerability): before 10.0.26100.3403
- [CVE-2025-29824](https://www.precursorintelligence.com/what-is/cve-2025-29824) (Microsoft Windows Common Log File System (CLFS) Driver Use-After-Free Vulnerability): before 10.0.26100.3775
- [CVE-2025-24993](https://www.precursorintelligence.com/what-is/cve-2025-24993) (Microsoft Windows NTFS Heap-Based Buffer Overflow Vulnerability): before 10.0.26100.3403
- [CVE-2025-24984](https://www.precursorintelligence.com/what-is/cve-2025-24984) (Microsoft Windows NTFS Information Disclosure Vulnerability): before 10.0.26100.3476
- [CVE-2025-24985](https://www.precursorintelligence.com/what-is/cve-2025-24985) (Microsoft Windows Fast FAT File System Driver Integer Overflow Vulnerability): before 10.0.26100.3476
- [CVE-2025-24991](https://www.precursorintelligence.com/what-is/cve-2025-24991) (Microsoft Windows NTFS Out-Of-Bounds Read Vulnerability): before 10.0.26100.3403
- [CVE-2025-26633](https://www.precursorintelligence.com/what-is/cve-2025-26633) (Microsoft Windows Management Console (MMC) Improper Neutralization Vulnerability): before 10.0.26100.3403
- [CVE-2025-21418](https://www.precursorintelligence.com/what-is/cve-2025-21418) (Microsoft Windows Ancillary Function Driver for WinSock Heap-Based Buffer Overflow Vulnerability): before 10.0.26100.3194
- [CVE-2025-21391](https://www.precursorintelligence.com/what-is/cve-2025-21391) (Microsoft Windows Storage Link Following Vulnerability): before 10.0.26100.3194
- [CVE-2025-21335](https://www.precursorintelligence.com/what-is/cve-2025-21335) (Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free Vulnerability): before 10.0.26100.2894
- [CVE-2025-21334](https://www.precursorintelligence.com/what-is/cve-2025-21334) (Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free Vulnerability): before 10.0.26100.2894
- [CVE-2025-21333](https://www.precursorintelligence.com/what-is/cve-2025-21333) (Microsoft Windows Hyper-V NT Kernel Integration VSP Heap-based Buffer Overflow Vulnerability): before 10.0.26100.2894
- [CVE-2024-49138](https://www.precursorintelligence.com/what-is/cve-2024-49138) (Microsoft Windows Common Log File System (CLFS) Driver Heap-Based Buffer Overflow Vulnerability): before 10.0.26100.2605
- [CVE-2024-43451](https://www.precursorintelligence.com/what-is/cve-2024-43451) (Microsoft Windows NTLMv2 Hash Disclosure Spoofing Vulnerability): before 10.0.26100.2314
- [CVE-2024-49039](https://www.precursorintelligence.com/what-is/cve-2024-49039) (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). They are 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, newest first:

- [CVE-2026-81963](https://www.precursorintelligence.com/what-is/cve-2026-81963): Microsoft Windows Link Following Vulnerability. High, CVSS 7.8, chance of use in 30 days 0.4%, known exploited since 8 September 2026.
- [CVE-2026-56155](https://www.precursorintelligence.com/what-is/cve-2026-56155): Microsoft Active Directory Federation Services Insufficient Granularity of Access Control Vulnerability. High, CVSS 7.8, chance of use in 30 days 0.3%, known exploited since 14 July 2026.
- [CVE-2025-59287](https://www.precursorintelligence.com/what-is/cve-2025-59287): Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data Vulnerability. Critical, CVSS 9.8, chance of use in 30 days >99%, known exploited since 24 October 2025.
- [CVE-2025-33073](https://www.precursorintelligence.com/what-is/cve-2025-33073): Microsoft Windows SMB Client Improper Access Control Vulnerability. High, CVSS 8.8, chance of use in 30 days 83%, known exploited since 20 October 2025.
- [CVE-2025-24990](https://www.precursorintelligence.com/what-is/cve-2025-24990): Microsoft Windows Untrusted Pointer Dereference Vulnerability. High, CVSS 7.8, chance of use in 30 days 6.4%, known exploited since 14 October 2025.
- [CVE-2025-59230](https://www.precursorintelligence.com/what-is/cve-2025-59230): Microsoft Windows Improper Access Control Vulnerability. High, CVSS 7.8, chance of use in 30 days 2.7%, known exploited since 14 October 2025.
- [CVE-2025-47827](https://www.precursorintelligence.com/what-is/cve-2025-47827): IGEL OS Use of a Key Past its Expiration Date Vulnerability. Medium, CVSS 4.6, chance of use in 30 days 4.9%, known exploited since 14 October 2025.
- [CVE-2025-33053](https://www.precursorintelligence.com/what-is/cve-2025-33053): Microsoft Windows External Control of File Name or Path Vulnerability. High, CVSS 8.8, chance of use in 30 days 87%, known exploited since 10 June 2025.
- [CVE-2025-30400](https://www.precursorintelligence.com/what-is/cve-2025-30400): Microsoft Windows DWM Core Library Use-After-Free Vulnerability. High, CVSS 7.8, chance of use in 30 days 1.9%, known exploited since 13 May 2025.
- [CVE-2025-30397](https://www.precursorintelligence.com/what-is/cve-2025-30397): Microsoft Windows Scripting Engine Type Confusion Vulnerability. High, CVSS 7.5, chance of use in 30 days 27%, known exploited since 13 May 2025.
- [CVE-2025-32706](https://www.precursorintelligence.com/what-is/cve-2025-32706): Microsoft Windows Common Log File System (CLFS) Driver Heap-Based Buffer Overflow Vulnerability. High, CVSS 7.8, chance of use in 30 days 2.3%, known exploited since 13 May 2025.
- [CVE-2025-32701](https://www.precursorintelligence.com/what-is/cve-2025-32701): Microsoft Windows Common Log File System (CLFS) Driver Use-After-Free Vulnerability. High, CVSS 7.8, chance of use in 30 days 1.4%, known exploited since 13 May 2025.
- [CVE-2025-32709](https://www.precursorintelligence.com/what-is/cve-2025-32709): Microsoft Windows Ancillary Function Driver for WinSock Use-After-Free Vulnerability. High, CVSS 7.8, chance of use in 30 days 1.8%, known exploited since 13 May 2025.
- [CVE-2025-24054](https://www.precursorintelligence.com/what-is/cve-2025-24054): Microsoft Windows NTLM Hash Disclosure Spoofing Vulnerability. Medium, CVSS 6.5, chance of use in 30 days 62%, known exploited since 17 April 2025.
- [CVE-2025-29824](https://www.precursorintelligence.com/what-is/cve-2025-29824): Microsoft Windows Common Log File System (CLFS) Driver Use-After-Free Vulnerability. High, CVSS 7.8, chance of use in 30 days 14%, known exploited since 8 April 2025.
- [CVE-2025-24993](https://www.precursorintelligence.com/what-is/cve-2025-24993): Microsoft Windows NTFS Heap-Based Buffer Overflow Vulnerability. High, CVSS 7.8, chance of use in 30 days 2.2%, known exploited since 11 March 2025.
- [CVE-2025-24984](https://www.precursorintelligence.com/what-is/cve-2025-24984): Microsoft Windows NTFS Information Disclosure Vulnerability. Medium, CVSS 4.6, chance of use in 30 days 2.0%, known exploited since 11 March 2025.
- [CVE-2025-24985](https://www.precursorintelligence.com/what-is/cve-2025-24985): Microsoft Windows Fast FAT File System Driver Integer Overflow Vulnerability. High, CVSS 7.8, chance of use in 30 days 3.9%, known exploited since 11 March 2025.
- [CVE-2025-24991](https://www.precursorintelligence.com/what-is/cve-2025-24991): Microsoft Windows NTFS Out-Of-Bounds Read Vulnerability. Medium, CVSS 5.5, chance of use in 30 days 2.0%, known exploited since 11 March 2025.
- [CVE-2025-26633](https://www.precursorintelligence.com/what-is/cve-2025-26633): Microsoft Windows Management Console (MMC) Improper Neutralization Vulnerability. High, CVSS 7.0, chance of use in 30 days 30%, known exploited since 11 March 2025.
- [CVE-2025-21418](https://www.precursorintelligence.com/what-is/cve-2025-21418): Microsoft Windows Ancillary Function Driver for WinSock Heap-Based Buffer Overflow Vulnerability. High, CVSS 7.8, chance of use in 30 days 1.6%, known exploited since 11 February 2025.
- [CVE-2025-21391](https://www.precursorintelligence.com/what-is/cve-2025-21391): Microsoft Windows Storage Link Following Vulnerability. High, CVSS 7.1, chance of use in 30 days 2.3%, known exploited since 11 February 2025.
- [CVE-2025-21335](https://www.precursorintelligence.com/what-is/cve-2025-21335): Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free Vulnerability. High, CVSS 7.8, chance of use in 30 days 1.4%, known exploited since 14 January 2025.
- [CVE-2025-21334](https://www.precursorintelligence.com/what-is/cve-2025-21334): Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free Vulnerability. High, CVSS 7.8, chance of use in 30 days 1.6%, known exploited since 14 January 2025.
- [CVE-2025-21333](https://www.precursorintelligence.com/what-is/cve-2025-21333): Microsoft Windows Hyper-V NT Kernel Integration VSP Heap-based Buffer Overflow Vulnerability. High, CVSS 7.8, chance of use in 30 days 10.0%, known exploited since 14 January 2025.
- [CVE-2024-49138](https://www.precursorintelligence.com/what-is/cve-2024-49138): Microsoft Windows Common Log File System (CLFS) Driver Heap-Based Buffer Overflow Vulnerability. High, CVSS 7.8, chance of use in 30 days 26%, known exploited since 10 December 2024.
- [CVE-2024-43451](https://www.precursorintelligence.com/what-is/cve-2024-43451): Microsoft Windows NTLMv2 Hash Disclosure Spoofing Vulnerability. Medium, CVSS 6.5, chance of use in 30 days 85%, known exploited since 12 November 2024.
- [CVE-2024-49039](https://www.precursorintelligence.com/what-is/cve-2024-49039): Microsoft Windows Task Scheduler Privilege Escalation Vulnerability. High, CVSS 8.8, chance of use in 30 days 14%, known exploited since 12 November 2024.
- [CVE-2013-3900](https://www.precursorintelligence.com/what-is/cve-2013-3900): Microsoft WinVerifyTrust function Remote Code Execution. Medium, CVSS 5.5, chance of use in 30 days 45%, known exploited since 10 January 2022.

## 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):

- [CVE-2025-59287](https://www.precursorintelligence.com/what-is/cve-2025-59287): >99%, Critical (CVSS 9.8), known exploited
- [CVE-2025-33053](https://www.precursorintelligence.com/what-is/cve-2025-33053): 87%, High (CVSS 8.8), known exploited
- [CVE-2024-43451](https://www.precursorintelligence.com/what-is/cve-2024-43451): 85%, Medium (CVSS 6.5), known exploited
- [CVE-2024-49113](https://www.precursorintelligence.com/what-is/cve-2024-49113): 84%, High (CVSS 7.5)
- [CVE-2025-33073](https://www.precursorintelligence.com/what-is/cve-2025-33073): 83%, High (CVSS 8.8), known exploited
- [CVE-2025-21298](https://www.precursorintelligence.com/what-is/cve-2025-21298): 81%, Critical (CVSS 9.8)
- [CVE-2024-49112](https://www.precursorintelligence.com/what-is/cve-2024-49112): 72%, Critical (CVSS 9.8)
- [CVE-2024-43642](https://www.precursorintelligence.com/what-is/cve-2024-43642): 63%, High (CVSS 7.5)
- [CVE-2025-24054](https://www.precursorintelligence.com/what-is/cve-2025-24054): 62%, Medium (CVSS 6.5), known exploited
- [CVE-2025-21285](https://www.precursorintelligence.com/what-is/cve-2025-21285): 56%, High (CVSS 7.5)

## Questions

### How many vulnerabilities does Windows Server 2025 have?

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.

### Which Windows Server 2025 vulnerabilities are being exploited?

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.

### Which versions of Windows Server 2025 do the exploited flaws affect?

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.

### How do I get alerts for Windows Server 2025?

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.

## Running Windows Server 2025?

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