CVE-2026-66308

Skype for Business and Lync Denial of Service Vulnerability

State: Published
Severity: 6.5 Medium
Published: Sep 8, 2026
Updated: Oct 31, 2026
Reserved: Jul 24, 2026

Description

Out-of-bounds read in Skype for Business allows an authorized attacker to deny service over a network.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	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	microsoft

Weaknesses

CWE-125 Out-of-bounds Read

Affected Products

Product	Versions
Skype for Business Server 2015 CU13Microsoft	9319.0 to before 6.0.9319.885Affected
Skype for Business Server 2019 CU8Microsoft	2046.0 to before 7.0.2046.569Affected
Skype for Business Server Subscription Edition CU1Microsoft	2046.0 to before 7.0.2046.879Affected

References

Skype for Business and Lync Denial of Service Vulnerabilityvendor-advisorypatch

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.