Vulnerability in Microsoft Lync_server
CVE-2021-26422
Skype for Business and Lync Remote Code Execution Vulnerability
EPSS: 0.022 (80.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Microsoft Lync_server — versions 2013
- Microsoft Lync Server 2013 Cu10 — versions 8308.0
- Microsoft Skype_for_business_server — versions 2015, 2019
- Microsoft Skype For Business Server 2015 Cu11 — versions 2015 CU11
- Microsoft Skype For Business Server 2019 Cu5 — versions 1.0
Public proof-of-concept exploits
References
- secure@microsoft.com (Patch, x_refsource_MISC, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-26422?
- CVE-2021-26422 is a high-severity vulnerability in Microsoft Lync_server. CVSS score: 7.2/10. Published 2021-05-11.
- How severe is CVE-2021-26422?
- High severity. CVSS v3 base score is 7.2 out of 10.
- Is CVE-2021-26422 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.