CVE-2026-77499 json
Windows DHCP Server Denial of Service Vulnerability
published 2026-09-08 2 mo ago modified 2026-10-31 8 d ago also EUVD-2026-73269
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.2%
- EPSS 1.2% chance of exploitation in 30 days, percentile 67%
- public exploits
- 0
- none known
Summary
Access of resource using incompatible type ('type confusion') in Windows DHCP Server allows an unauthorized attacker to deny service over a network.
Patch / fix
- Microsoft Windows 10 Version 1607 10.0.14393.9512
- Microsoft Windows 10 Version 1809 10.0.17763.9245
- Microsoft Windows Server 2012 6.2.9200.26349
- Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.26349
- Microsoft Windows Server 2012 R2 6.3.9600.23398
- Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.23398
- Microsoft Windows Server 2016 10.0.14393.9512
- Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.9512
- Microsoft Windows Server 2019 10.0.17763.9245
- Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.9245
- Microsoft Windows Server 2022 10.0.20348.5622
- Microsoft Windows Server 2025 10.0.26100.33438
- Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.33438
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
1.17% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).
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 10 Version 1607
- Microsoft Windows 10 Version 1809
- Microsoft Windows Server 2012
- Microsoft Windows Server 2012 (Server Core installation)
- 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-843 Access of Resource Using Incompatible Type
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2026-77499
vendor-advisory, patch
Sources
- CVE List CVE-2026-77499
- NVD CVE-2026-77499
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.