Sep 2026: Skype for Business and Lync Denial of Service Vulnerability
CVE-2026-66303 Published on September 8, 2026
Skype for Business and Lync Denial of Service Vulnerability
Null pointer dereference in Skype for Business allows an authorized attacker to deny service over a network.
Weakness Type
NULL Pointer Dereference
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. NULL pointer dereference issues can occur through a number of flaws, including race conditions, and simple programming omissions.
Products Associated with CVE-2026-66303
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Affected Versions
Microsoft Skype for Business Server 2015 CU13:- Version 9319.0 and below 6.0.9319.885 is affected.
- Version 2046.0 and below 7.0.2046.569 is affected.
- Version 2046.0 and below 7.0.2046.879 is affected.