CVE-2025-49666 json
Windows Server Setup and Boot Event Collection Remote Code Execution Vulnerability
published 2025-07-08 16 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-20578
- cvss
- 7.2
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.4%
- EPSS 1.4% chance of exploitation in 30 days, percentile 72%
- public exploits
- 0
- none known
Summary
Heap-based buffer overflow in Windows Kernel allows an authorized attacker to execute code over a network.
Patch / fix
- Microsoft Windows Server 2016 10.0.14393.8246
- Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.8246
- Microsoft Windows Server 2019 10.0.17763.7558
- Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.7558
- Microsoft Windows Server 2022 10.0.20348.3932
- Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1732
- Microsoft Windows Server 2025 10.0.26100.4652
- Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.4652
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 16 mo ago
Exploit prediction
1.42% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.2 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C |
| CNA | 3.1 | 7.2 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
Affected products
- 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 2022, 23H2 Edition (Server Core installation)
- Microsoft Windows Server 2025
- Microsoft Windows Server 2025 (Server Core installation)
Classification
- Weakness
-
- CWE-122 Heap-based Buffer Overflow
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2025-49666
vendor-advisory, patch
Sources
- CVE List CVE-2025-49666
- NVD CVE-2025-49666
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.