CVE-2021-24099 : Skype for Business and Lync Denial of Service Vulnerability

Skype for Business and Lync Denial of Service Vulnerability

Published 2021-02-25 23:15:16

Updated 2023-12-29 17:15:57

View at NVD, CVE.org

Vulnerability category: Denial of service

Products affected by CVE-2021-24099

Microsoft » Lync Server » Version: 2013
cpe:2.3:a:microsoft:lync_server:2013:*:*:*:*:*:*:*
Matching versions
Microsoft » Skype For Business Server » Version: 2015 Update CU8
cpe:2.3:a:microsoft:skype_for_business_server:2015:cu8:*:*:*:*:*:*
Matching versions
Microsoft » Skype For Business Server » Version: 2019 Update CU2
cpe:2.3:a:microsoft:skype_for_business_server:2019:cu2:*:*:*:*:*:*
Matching versions

EPSS FAQ

2.48%

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

~ 84 %

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

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
4.0	MEDIUM	AV:N/AC:L/Au:S/C:N/I:N/A:P	8.0	2.9	NIST
Access Vector: Network Access Complexity: Low Authentication: Single Confidentiality Impact: None Integrity Impact: None Availability Impact: Partial
6.5	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	2.8	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: High
6.5	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	2.8	3.6	Microsoft Corporation
Attack Vector: Network Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: High

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-24099

CVE-2021-24099 - Security Update Guide - Microsoft - Skype for Business and Lync Denial of Service Vulnerability
Patch;Vendor Advisory

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