Executive brief
Microsoft Exchange Server is a widely-deployed email and collaboration platform used by organizations worldwide. A heap-based buffer overflow vulnerability allows an authenticated attacker to execute arbitrary code on affected servers over the network, potentially compromising email data, user accounts, and business continuity.
Technical details
A heap-based buffer overflow exists in Microsoft Exchange Server that can be triggered by an authenticated attacker over the network. The vulnerability allows an attacker with valid credentials to overflow a heap buffer, leading to arbitrary code execution with the privileges of the Exchange service. The attack requires network access and valid authentication credentials. Microsoft has released security updates to address this vulnerability.
Affected products
- Microsoft Exchange Server
Timeline
- 2026-08-11: disclosed