Microsoft Windows Server DHCP: 14 Vulnerabilities Disclosed Together, Including RCE and Privilege Escalation
Microsoft addressed 14 vulnerabilities in Windows Server DHCP service, including flaws allowing code execution and privilege escalation, disclosed on August 11, 2026.
Key findings
- Microsoft patched 14 vulnerabilities in Windows Server DHCP service on August 11, 2026.
- One high-severity flaw (CVE-2026-62823) allows for adjacent network code execution.
- Multiple high-severity vulnerabilities enable local privilege escalation via improper link resolution.
- Several medium-severity integer underflow flaws allow for information disclosure over adjacent networks.
- The batch was disclosed simultaneously as part of Microsoft's August 2026 Patch Tuesday.
On August 11, 2026, Microsoft released a significant security update addressing a batch of 14 vulnerabilities affecting the Windows Server DHCP service. This coordinated disclosure event, with all CVEs published simultaneously, highlights critical security weaknesses within a core network service. The vulnerabilities span several categories, including heap-based buffer overflows, integer underflows, and improper link resolution, with potential impacts ranging from information disclosure to remote code execution and local privilege escalation.
A notable vulnerability, CVE-2026-62823, is a high-severity heap-based buffer overflow that could allow an unauthorized attacker to execute code over an adjacent network. This particular CVE was mentioned in multiple security analyses as part of Microsoft's August 2026 Patch Tuesday, which included a total of 415 to 421 vulnerabilities across various products. While this specific DHCP vulnerability was not explicitly stated as exploited in the wild in the provided news coverage, other vulnerabilities patched in the same release were.
Several CVEs, including CVE-2026-62814, CVE-2026-62745, CVE-2026-62742, CVE-2026-62720, CVE-2026-62718, CVE-2026-62716, CVE-2026-62715, and CVE-2026-62714, are categorized as medium severity due to an integer underflow in the Windows DHCP Server. These flaws could permit an unauthorized attacker to disclose sensitive information over an adjacent network.
A significant cluster of high-severity vulnerabilities, CVE-2026-62812, CVE-2026-62807, CVE-2026-62803, CVE-2026-62776, and CVE-2026-62761, all stem from an "improper link resolution before file access" flaw. These vulnerabilities allow an authorized attacker to elevate privileges locally on a compromised system. The sheer number of these privilege escalation flaws within the DHCP service underscores a critical area for administrators to address.
Microsoft's August 2026 Patch Tuesday addressed a large volume of vulnerabilities, with security researchers noting the high prevalence of elevation of privilege and remote code execution flaws. While the provided information does not detail specific affected versions or patch release numbers for the DHCP service vulnerabilities, it is imperative for organizations to apply the latest security updates from Microsoft to mitigate these risks. Prompt patching is crucial, especially given that some vulnerabilities in the broader August release were known to be exploited or publicly disclosed.
The coordinated disclosure of these 14 vulnerabilities in the Windows Server DHCP service emphasizes the need for continuous vigilance and timely patching. Administrators should prioritize updating their systems to protect against potential exploitation, particularly for the high-severity remote code execution and privilege escalation flaws. Further investigation into specific version applicability and patch deployment status is recommended.