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CVE-2021-26421— Skype for Business and Lync Spoofing Vulnerability

Quick assessment

Affected
Microsoft Skype for Business Server 2015 CU11
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.

Microsoft Skype for Business Server是美国微软（Microsoft）公司的一套安全统一的通信平台，它提供即时消息 (IM)、音频和视频通话、联机会议、联机状态信息和共享功能。 Skype for Business and Microsoft Lync存在安全漏洞。以下产品和版本受到影响：Microsoft Lync Server 2013 CU10,Skype for Business Server 2015 CU11,

CVSS 6.5 · Medium EPSS 1.41% · P71

Possible ATT&CK Techniques 1 AI

T1199 · Trusted Relationship
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I. Basic Information for CVE-2021-26421

Vulnerability Information
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Vulnerability Title
Skype for Business and Lync Spoofing Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Skype for Business and Lync Spoofing Vulnerability
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Skype for Business Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Skype for Business Server是美国微软（Microsoft）公司的一套安全统一的通信平台，它提供即时消息 (IM)、音频和视频通话、联机会议、联机状态信息和共享功能。 Skype for Business and Microsoft Lync存在安全漏洞。以下产品和版本受到影响：Microsoft Lync Server 2013 CU10,Skype for Business Server 2015 CU11,
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Skype for Business Server 2015 CU11 2015 CU11 ~ 2046.369 cpe:2.3:a:microsoft:skype_for_business_server:2015:cumulative_update_11:*:*:*:*:*:*
Microsoft Microsoft Lync Server 2013 CU10 8308.0 ~ 8308.1144 cpe:2.3:a:microsoft:lync_server:2013:cumulative_update_10:*:*:*:*:*:*

II. Public POCs for CVE-2021-26421

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III. Intelligence Information for CVE-2021-26421

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Vendor Advisories for CVE-2021-26421 (1)

Same Patch Batch · Microsoft · 2021-05-11 · 52 CVEs total

CVE-2021-28476 9.9 CRITICAL Windows Hyper-V Remote Code Execution Vulnerability
CVE-2021-31166 9.8 CRITICAL HTTP Protocol Stack Remote Code Execution Vulnerability
CVE-2021-28455 8.8 HIGH Microsoft Jet Red Database Engine and Access Connectivity Engine Remote Code Execution Vul
CVE-2021-27068 8.8 HIGH Visual Studio Remote Code Execution Vulnerability
CVE-2021-31194 8.8 HIGH OLE Automation Remote Code Execution Vulnerability
CVE-2021-31181 8.8 HIGH Microsoft SharePoint Remote Code Execution Vulnerability
CVE-2021-28474 8.8 HIGH Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2021-31214 7.8 HIGH Visual Studio Code Remote Code Execution Vulnerability
CVE-2021-31180 7.8 HIGH Microsoft Office Graphics Remote Code Execution Vulnerability
CVE-2021-28465 7.8 HIGH Web Media Extensions Remote Code Execution Vulnerability
CVE-2021-31179 7.8 HIGH Microsoft Office Remote Code Execution Vulnerability
CVE-2021-31169 7.8 HIGH Windows Container Manager Service Elevation of Privilege Vulnerability
CVE-2021-31177 7.8 HIGH Microsoft Office Remote Code Execution Vulnerability
CVE-2021-31170 7.8 HIGH Windows Graphics Component Elevation of Privilege Vulnerability
CVE-2021-31175 7.8 HIGH Microsoft Office Remote Code Execution Vulnerability
CVE-2021-31187 7.8 HIGH Windows WalletService Elevation of Privilege Vulnerability
CVE-2021-31190 7.8 HIGH Windows Container Isolation FS Filter Driver Elevation of Privilege Vulnerability
CVE-2021-31208 7.8 HIGH Windows Container Manager Service Elevation of Privilege Vulnerability
CVE-2021-31198 7.8 HIGH Microsoft Exchange Server Remote Code Execution Vulnerability
CVE-2021-31165 7.8 HIGH Windows Container Manager Service Elevation of Privilege Vulnerability

Showing top 20 of 52 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same vendor: Microsoft

V. Comments for CVE-2021-26421

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