High severity · published Oct 13, 2026
CVE-2026-83677
Windows DHCP Client Denial of Service Vulnerability
7.5
CVSS
1.1%
EPSS
No
On KEV
Description
Missing release of memory after effective lifetime in Windows DHCP Client allows an unauthorized attacker to deny service over a network.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 66% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
W1
Windows 11 Version 24H2 · Microsoft
10.0.26100.0 before 10.0.26100.9711 · source: vendor
W1
Windows 11 Version 25H2 · Microsoft
10.0.26200.0 before 10.0.26200.9711 · source: vendor
W1
Windows 11 Version 26H2 · Microsoft
10.0.26300.0 before 10.0.26300.9711 · source: vendor
W1
Windows 11 version 26H1 · Microsoft
10.0.28000.0 before 10.0.28000.3231 · source: vendor
WS
Windows Server 2025 · Microsoft
10.0.26100.0 before 10.0.26100.33650 · source: vendor
WS
Windows Server 2025 (Server Core installation) · Microsoft
10.0.26100.0 before 10.0.26100.33650 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-83677
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-83677
vendor-advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83677
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