CVE-2026-69777: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 11 Version 24H2
Description
CVE-2026-69777 is a heap-based buffer overflow vulnerability in the Windows DHCP Client component of Microsoft Windows 11 Version 24H2. This flaw allows an authorized attacker on an adjacent network to elevate their privileges. The vulnerability has a high severity score of 8.0 and has been officially fixed by Microsoft.
CVSS v3.1
Score 8.0high
Affected software
Microsoft
Windows 11 Version 24H2
Microsoft
Windows 11 Version 25H2
Microsoft
Windows 11 version 26H1
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, identified as CVE-2026-69777, involves a heap-based buffer overflow in the Windows DHCP Client on Windows 11 Version 24H2. An attacker with authorized access on an adjacent network can exploit this flaw to elevate privileges. The vulnerability has a CVSS v3.1 base score of 8.0, indicating high impact on confidentiality, integrity, and availability. Microsoft has released an official fix for affected versions.
Potential Impact
Successful exploitation of this vulnerability allows an authorized attacker on an adjacent network to elevate their privileges on the affected Windows 11 system. This can lead to full compromise of the system's confidentiality, integrity, and availability.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security updates provided by Microsoft for Windows 11 Version 24H2 to remediate this vulnerability. Refer to the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69777 for update details.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-03T22:46:09.552Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69777","vendor":"Microsoft"}]
Threat ID: 6aa04529acd9273b49fa992e
Added to database: 09/08/2026, 17:26:01 UTC
Last enriched: 10/16/2026, 21:33:08 UTC
Last updated: 10/23/2026, 15:10:14 UTC
Views: 31
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