CVE-2026-66303 MEDIUM

CVE-2026-66303: Skype for Business and Lync Denial of Service Vulnerability

Vendor Microsoft
Product Skype for Business Server 2015 CU13
Weakness CWE-476
Published September 8, 2026
Last update September 29, 2026
View on NVD All CVEs

CVSS base score

6.5/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

What the vulnerability does

01Description

Null pointer dereference in Skype for Business allows an authorized attacker to deny service over a network.

Key dates

02Disclosure timeline

September 8, 2026 CVE published
September 29, 2026 Record updated