Skype for Business and Lync Denial of Service Vulnerability

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-66308
StatePUBLISHED
Assignermicrosoft
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-08 19:18:08 UTC
Updated2026-09-16 19:25:08 UTC
DescriptionOut-of-bounds read in Skype for Business allows an authorized attacker to deny service over a network.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

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

EPSS: 0.006120000 probability, percentile 0.476710000 (date 2026-09-16)

Problem Types: CWE-125 | CWE-125 CWE-125: Out-of-bounds Read

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1CNACVSS6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Microsoft Skype For Business Server 2015 cumulative_update_13 All All
Application Microsoft Skype For Business Server 2015 cumulative_update_13_hotfix_2 All All
Application Microsoft Skype For Business Server 2019 cumulative_update_8 All All
Application Microsoft Skype For Business Server 2019 cumulative_update_8_hotfix1 All All
Application Microsoft Skype For Business Server 2019 cumulative_update_8_hotfix2 All All
Application Microsoft Skype For Business Server Subscription Edition 7.0.2046.849 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Microsoft Skype For Business Server 2015 CU13 affected 9319.0 6.0.9319.885 custom x64-based Systems
CNA Microsoft Skype For Business Server 2019 CU8 affected 2046.0 7.0.2046.569 custom x64-based Systems
CNA Microsoft Skype For Business Server Subscription Edition CU1 affected 2046.0 7.0.2046.879 custom x64-based Systems

References

ReferenceSourceLinkTags
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66308 [email protected] msrc.microsoft.com Patch, Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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