Executive brief
Microsoft DNS Server contains a race condition vulnerability in concurrent handling of shared resources, allowing an attacker to execute arbitrary code remotely over the network. DNS servers are critical infrastructure used by organizations to resolve domain names; compromise could enable attackers to intercept or redirect traffic, establish persistence, or launch further attacks against the organization and its users.
Technical details
The vulnerability is a race condition (CWE-362) arising from improper synchronization of concurrent access to shared resources in the DNS Server component. The race condition can be triggered over the network without requiring authentication, allowing an attacker to exploit the timing window to execute arbitrary code with elevated privileges. The attack requires precise timing but does not require user interaction. Microsoft has released patches; organizations should apply security updates immediately to affected DNS Server instances.
Affected products
- Microsoft DNS Server
Timeline
- 2026-09-08: disclosed