CVE-2026-66307— Skype for Business and Lync Denial of Service Vulnerability
Quick assessment
Affected
Microsoft Skype for Business Server 2015 CU13
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Skype for Business 中的整数下溢（回绕或溢出）漏洞，允许未经授权的攻击者通过网络发起拒绝服务（DoS）攻击。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of ServiceAffected Version Matrix 3
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Microsoft | Skype for Business Server 2015 CU13 | 9319.0< 6.0.9319.885 |
affected |
| Microsoft | Skype for Business Server 2019 CU8 | 2046.0< 7.0.2046.569 |
affected |
| Microsoft | Skype for Business Server Subscription Edition CU1 | 2046.0< 7.0.2046.879 |
affected |
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I. Basic Information for CVE-2026-66307
Vulnerability Information
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Vulnerability Title
Skype for Business and Lync Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Integer underflow (wrap or wraparound) in Skype for Business allows an unauthorized attacker to deny service over a network.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数下溢(超界折返)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Microsoft | Skype for Business Server 2015 CU13 | 9319.0 ~ 6.0.9319.885 | - |
|
| Microsoft | Skype for Business Server 2019 CU8 | 2046.0 ~ 7.0.2046.569 | - |
|
| Microsoft | Skype for Business Server Subscription Edition CU1 | 2046.0 ~ 7.0.2046.879 | - |
|
II. Public POCs for CVE-2026-66307
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-66307 (1)
Same Patch Batch · Microsoft · 2026-09-08 · 966 CVEs total
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Showing top 20 of 966 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Skype for Business Server 2015 CU13
-
CVE-2026-66303
Skype for Business and Lync Denial of Service Vulnerability -
CVE-2026-69642
Skype for Business Spoofing Vulnerability -
CVE-2026-69646
Skype for Business Spoofing Vulnerability -
CVE-2026-66305
Skype for Business Spoofing Vulnerability -
CVE-2026-63523
Skype for Business Spoofing Vulnerability
Same vendor: Microsoft
-
CVE-2026-66303
Skype for Business and Lync Denial of Service Vulnerability -
CVE-2026-69646
Skype for Business Spoofing Vulnerability -
CVE-2026-69642
Skype for Business Spoofing Vulnerability -
CVE-2026-66305
Skype for Business Spoofing Vulnerability -
CVE-2026-63523
Skype for Business Spoofing Vulnerability
Same weakness: CWE-191
-
CVE-2026-81977
Acrobat Reader | Integer Underflow (Wrap or Wraparound) (CWE -
CVE-2026-78453
Microsoft Windows SCSI Class System File Information Disclos -
CVE-2026-77488
Microsoft SQL Server Information Disclosure Vulnerability -
CVE-2026-71352
Windows Remote Access Connection Manager Remote Code Executi -
CVE-2026-69824
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