What’s Vulnerable › Vulnerabilities

CVE-2022-33633: Skype for Business and Lync Remote Code Execution Vulnerability

• Severity: medium (CVSS 6.5 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-07-12 · updated 2026-06-17

Description

Skype for Business and Lync Remote Code Execution Vulnerability

Affected products

• Microsoft Lync Server: 2013-cumulative_update_10
• Microsoft Skype for Business Server 2019 CU2: 2015-cumulative_update_12, 2019-cumulative_update_6
• Microsoft Lync Server 2013 CU10: from 8308.0 before 8308.1198 — fixed in 8308.1198
• Microsoft Skype for Business Server 2015 CU12: from 9319.0 before 9319.634 — fixed in 9319.634
• Microsoft Skype for Business Server 2019 CU6: from 2046.0 before 2046.404 — fixed in 2046.404

How to fix

Upgrade to a fixed version: Microsoft Lync Server 2013 CU10 8308.1198; Microsoft Skype for Business Server 2015 CU12 9319.634; Microsoft Skype for Business Server 2019 CU6 2046.404. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-33633
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-33633

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