CVE-2026-83677
Windows DHCP Client Denial of Service Vulnerability
At a glance
- Severity
- HIGH 7.5
- EPSS
- EPSS 1.13 % · percentile 66 (2026-10-27)
- State
- PUBLISHED
- Published
- Updated
- Assigner
- microsoft
- NVD status
- Undergoing Analysis
Description
Missing release of memory after effective lifetime in Windows DHCP Client allows an unauthorized attacker to deny service over a network.
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 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 | microsoft |
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | NVD · secure@microsoft.com (Secondary) |
Weaknesses (CWE)
European references
- ENISA EUVD · EUVD-2026-99945
- GCVE · GCVE-0-2026-83677
CERT-FR advisories
- CERTFR-2026-AVI-1314 — Multiples vulnérabilités dans Microsoft Windows · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| Microsoft · Windows 11 Version 24H2 | affected 10.0.26100.0 < 10.0.26100.9711 |
| Microsoft · Windows 11 Version 25H2 | affected 10.0.26200.0 < 10.0.26200.9711 |
| Microsoft · Windows 11 version 26H1 | affected 10.0.28000.0 < 10.0.28000.3231 |
| Microsoft · Windows 11 Version 26H2 | affected 10.0.26300.0 < 10.0.26300.9711 |
| Microsoft · Windows Server 2025 | affected 10.0.26100.0 < 10.0.26100.33650 |
| Microsoft · Windows Server 2025 (Server Core installation) | affected 10.0.26100.0 < 10.0.26100.33650 |
References
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |