CVE-2021-24099 json
Skype for Business and Lync Denial of Service Vulnerability
published 2021-02-25 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-11015
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 3.2%
- EPSS 3.2% chance of exploitation in 30 days, percentile 88%
- public exploits
- 0
- none known
Summary
Skype for Business and Lync Denial of Service Vulnerability
Patch / fix
Exploit prediction
3.20% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C |
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 4.0 | AV:N/AC:L/Au:S/C:N/I:N/A:P |
Affected products
- Microsoft Skype for Business Server 2019 CU2
- Microsoft Skype for Business Server 2015 CU 8
- Microsoft Microsoft Lync Server 2013
References
-
portal.msrc.microsoft.com
/en-US/security-guidance/advisory/CVE-2021-24099
patch, vendor-advisory
Sources
- CVE List CVE-2021-24099
- NVD CVE-2021-24099
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.