Executive brief
A security vulnerability exists in the Microsoft Windows DNS component, which is responsible for translating human-readable domain names into IP addresses. An attacker who already has basic access to a system could exploit this flaw to gain higher-level administrative permissions. This could allow them to take full control of the affected server, potentially leading to data theft or further network compromise.
Technical details
A heap-based buffer overflow (CWE-122) exists within the Microsoft Windows DNS service. The vulnerability is triggered when the component improperly handles memory allocation, allowing an attacker to overwrite adjacent memory space. To exploit this, an attacker must have local access to the system with low-level privileges (PR:L) and must overcome high complexity requirements (AC:H), likely involving specific timing or memory states. Successful exploitation allows the attacker to execute code with elevated system privileges. Microsoft has released security updates to address this issue.
Affected products
- Microsoft Windows DNS
Timeline
- 2026-06-09: disclosed
- 2026-06-09: advisory