CVE-2021-26422 json
Skype for Business and Lync Remote Code Execution Vulnerability
published 2021-05-11 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-13228
- cvss
- 7.2
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.2%
- EPSS 2.2% chance of exploitation in 30 days, percentile 82%
- public exploits
- 0
- none known
Summary
Skype for Business and Lync Remote Code Execution Vulnerability
Patch / fix
- Microsoft Microsoft Lync Server 2013 CU10 8308.1144
- Microsoft Skype for Business Server 2019 CU5 2046.369
- Microsoft Skype for Business Server 2015 CU11 9319.606
Exploit prediction
2.22% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.2 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C |
| CNA | 3.1 | 7.2 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.5 | AV:N/AC:L/Au:S/C:P/I:P/A:P |
Affected products
- Microsoft Microsoft Lync Server 2013 CU10
- Microsoft Skype for Business Server 2019 CU5
- Microsoft Skype for Business Server 2015 CU11
References
-
portal.msrc.microsoft.com
/en-US/security-guidance/advisory/CVE-2021-26422
patch, vendor-advisory
Sources
- CVE List CVE-2021-26422
- NVD CVE-2021-26422
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.