CVE-2026-77891: Windows DHCP Server Remote Code Execution Vulnerability
Out-of-bounds read in Windows DHCP Server allows an authorized attacker to execute code locally.
Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77891
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-77891 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
Recent advisories for Windows DHCP Server
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- highCVE-2026-77895: Out-of-bounds read in Windows DHCP Server allows an unauthorized attacker to deny service over…nvd · 2026-09-08
- highCVE-2026-77893: Out-of-bounds read in Windows DHCP Server allows an unauthorized attacker to deny service over…nvd · 2026-09-08
- mediumCVE-2026-77891: Out-of-bounds read in Windows DHCP Server allows an authorized attacker to execute code locall…nvd · 2026-09-08
- highCVE-2026-77890: Access of resource using incompatible type ('type confusion') in Windows DHCP Server allows an…nvd · 2026-09-08
- highCVE-2026-77889: Access of resource using incompatible type ('type confusion') in Windows DHCP Server allows an…nvd · 2026-09-08
- highCVE-2026-77888: Access of resource using incompatible type ('type confusion') in Windows DHCP Server allows an…nvd · 2026-09-08
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