High severity · published Sep 8, 2026
CVE-2026-69777
Windows DHCP Client Elevation of Privilege Vulnerability
8.0
CVSS
0.6%
EPSS
No
On KEV
Description
Heap-based buffer overflow in Windows DHCP Client allows an authorized attacker to elevate privileges over an adjacent network.
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Adjacent
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 47% 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 10.0.26100.9445 · source: vendor
W1
Windows 11 Version 25H2 · Microsoft
10.0.26200.0 before 10.0.26200.9445 · source: vendor
W1
Windows 11 version 26H1 · Microsoft
10.0.28000.0 before 10.0.28000.2954 · source: vendor
W1
Windows 11 24h2 · Microsoft
before 10.0.26100.9445; before 10.0.26100.9445 · source: NVD
W1
Windows 11 25h2 · Microsoft
before 10.0.26200.9445; before 10.0.26200.9445 · source: NVD
W1
Windows 11 26h1 · Microsoft
before 10.0.28000.2954; before 10.0.28000.2954 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-69777
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-69777
vendor-advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69777
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