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

Project Subscriptions

Vendors Products
Microsoft Subscribe
Skype For Business Server Subscribe
Skype For Business Server 2015 Subscribe
Skype For Business Server 2019 Subscribe
Skype For Business Server Subscription Edition Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 16 Sep 2026 19:30:00 +0000

Type Values Removed Values Added
First Time appeared Microsoft skype For Business Server
CPEs cpe:2.3:a:microsoft:skype_for_business_server:2015:cumulative_update_13:*:*:*:*:*:*
cpe:2.3:a:microsoft:skype_for_business_server:2015:cumulative_update_13_hotfix_2:*:*:*:*:*:*
cpe:2.3:a:microsoft:skype_for_business_server:2019:cumulative_update_8:*:*:*:*:*:*
cpe:2.3:a:microsoft:skype_for_business_server:2019:cumulative_update_8_hotfix1:*:*:*:*:*:*
cpe:2.3:a:microsoft:skype_for_business_server:2019:cumulative_update_8_hotfix2:*:*:*:*:*:*
cpe:2.3:a:microsoft:skype_for_business_server_subscription_edition:7.0.2046.849:*:*:*:*:*:*:*
Vendors & Products Microsoft skype For Business Server

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: 2026-09-16T21:59:38.574Z

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 : Analyzed

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

Modified: 2026-09-16T19:24:44.230

Link: CVE-2026-66307

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-11T23:00:05Z

Weaknesses