Integer underflow (wrap or wraparound) in Skype for Business allows an unauthorized attacker to deny service over a network.
Advisories

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Fixes

Solution

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Workaround

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History

Tue, 08 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 08 Sep 2026 19:00:00 +0000

Type Values Removed Values Added
Description Integer underflow (wrap or wraparound) in Skype for Business allows an unauthorized attacker to deny service over a network.
Title Skype for Business and Lync Denial of Service Vulnerability
First Time appeared Microsoft
Microsoft skype For Business Server 2015
Microsoft skype For Business Server 2019
Microsoft skype For Business Server Subscription Edition
Weaknesses CWE-191
CPEs cpe:2.3:a:microsoft:skype_for_business_server_2015:*:cu13:*:*:*:*:*:*
cpe:2.3:a:microsoft:skype_for_business_server_2019:*:cu8:*:*:*:*:*:*
cpe:2.3:a:microsoft:skype_for_business_server_subscription_edition:*:cu1:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft skype For Business Server 2015
Microsoft skype For Business Server 2019
Microsoft skype For Business Server Subscription Edition
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-09-08T19:17:17.096Z

Reserved: 2026-07-24T18:06:51.294Z

Link: CVE-2026-66307

cve-icon Vulnrichment

Updated: 2026-09-08T19:17:09.539Z

cve-icon NVD

Status : Undergoing Analysis

Published: 2026-09-08T19:18:08.327

Modified: 2026-09-08T20:17:38.257

Link: CVE-2026-66307

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses