Vulnerability in Microsoft Lync Server
CVE-2021-26422
Skype for Business and Lync Remote Code Execution Vulnerability
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.022 (82.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 82.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.022 · newest: 0.022 · change: 0.000
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
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26422 (Patch, 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.