Vulnerability details
CVE-2026-88243
Microsoft Windows Server
Windows DHCP Server Remote Code Execution Vulnerability
CVSS 3.1
9.8Critical
Remedy
Versions not listed as affected in the CVE record:
- Windows Server 2016 — version 10.0.14393.9688 and later
- Windows Server 2016 (Server Core installation) — version 10.0.14393.9688 and later
- Windows Server 2019 — version 10.0.17763.9487 and later
- Windows Server 2019 (Server Core installation) — version 10.0.17763.9487 and later
- Windows Server 2022 — version 10.0.20348.5870 and later
- Windows Server 2025 — version 10.0.26100.33822 and later
Official description
Out-of-bounds read in Windows DHCP Server allows an unauthorized attacker to execute code over a network.
Related news
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.8Critical | 3.1 | CVEProject cvelistV5 (CNA) (microsoft) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Microsoft | Windows Server 2016 | 10.0.14393.0 ≤ v < 10.0.14393.9688 | CVEProject cvelistV5 (CNA) |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.14393.0 ≤ v < 10.0.14393.9688 | CVEProject cvelistV5 (CNA) |
| Microsoft | Windows Server 2019 | 10.0.17763.0 ≤ v < 10.0.17763.9487 | CVEProject cvelistV5 (CNA) |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0 ≤ v < 10.0.17763.9487 | CVEProject cvelistV5 (CNA) |
| Microsoft | Windows Server 2022 | 10.0.20348.0 ≤ v < 10.0.20348.5870 | CVEProject cvelistV5 (CNA) |
| Microsoft | Windows Server 2025 | 10.0.26100.0 ≤ v < 10.0.26100.33822 | CVEProject cvelistV5 (CNA) |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0 ≤ v < 10.0.26100.33822 | CVEProject cvelistV5 (CNA) |
References and advisories
1- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88243 vendor-advisorypatch
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Details
- Published
- 2026-11-10
- Last updated
- 2026-11-11
- State
- Published
- Assigner (CNA)
- microsoft
- Kolun priority
- 41 · Medium
Exploit prediction (EPSS)
1%
Probability of exploitation in 30 days
63.4%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-125Out-of-bounds Read