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

Skype for Business and Lync Spoofing Vulnerability

Published 2021-05-11 19:15:09

Updated 2023-08-02 00:15:11

View at NVD, CVE.org

Products affected by CVE-2021-26421

Microsoft » Lync Server » Version: 2013 Update Cumulative Update 10
cpe:2.3:a:microsoft:lync_server:2013:cumulative_update_10:*:*:*:*:*:*
Matching versions
Microsoft » Skype For Business Server » Version: 2015 Update Cumulative Update 11
cpe:2.3:a:microsoft:skype_for_business_server:2015:cumulative_update_11:*:*:*:*:*:*
Matching versions

EPSS FAQ

0.07%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 34 %

Percentile, the proportion of vulnerabilities that are scored at or less

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
5.8	MEDIUM	AV:N/AC:M/Au:N/C:P/I:P/A:N	8.6	4.9	NIST
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: None
7.1	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N	2.8	4.2	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Unchanged Confidentiality: High Integrity: Low Availability: None
6.5	MEDIUM	CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N	1.3	4.7	Microsoft Corporation
Attack Vector: Network Attack Complexity: High Privileges Required: Low User Interaction: Required Scope: Changed Confidentiality: High Integrity: Low Availability: None

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26421

CVE-2021-26421 - Security Update Guide - Microsoft - Skype for Business and Lync Spoofing Vulnerability
Patch;Vendor Advisory

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