CVE-2026-77887 Microsoft CVE debrief

Who should care

System administrators and security teams responsible for Windows DHCP Server deployments should assess exposure and apply patches immediately to prevent local code execution.

Why it matters

The out-of-bounds read vulnerability in Windows DHCP Server allows authorized attackers to execute code locally, posing a risk to system administrators and security teams responsible for Windows DHCP Server deployments.

• Local code execution by authorized attackers
• Potential disruption to critical infrastructure
• Increased risk of lateral movement

Technical summary

The vulnerability exists in Windows DHCP Server and allows an authorized attacker to execute code locally due to an out-of-bounds read. The CVSS score is 6.4 and the severity is MEDIUM. This vulnerability can be mitigated by applying patches immediately to prevent local code execution. Review and update vulnerability management processes to ensure timely patching and monitor system logs for potential exploitation attempts.

Defensive priority

Apply patches immediately to prevent local code execution

Recommended defensive actions

• Apply patches immediately to prevent local code execution
• Review and update vulnerability management processes to ensure timely patching
• Monitor system logs for potential exploitation attempts

Evidence notes

The vulnerability is described as an out-of-bounds read in Windows DHCP Server, which allows an authorized attacker to execute code locally. The CVE record and NVD entry provide details on the vulnerability.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.