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CVE-2021-26422
Skype for Business and Lync Remote Code Execution Vulnerability
High7.2EPSS 2.2%
- Published
- Updated
- Reserved
- Assigned by
- microsoft
Description
Skype for Business and Lync Remote Code Execution Vulnerability
Timeline
ID reserved
By microsoft
- 3 months later
· 3 months later
Published
- 3 years later
· 3 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| microsoftCNA (assigner) | 3.1 | High7.2 | 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 |
| NVDNVD · Modified | 3.1 | High7.2 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 2.2% · top 17% of all CVEs (7 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.2.
Weakness
- Security Feature Bypass
Affected products
Microsoft · Microsoft Lync Server 2013 CU10
- affected 8308.0 – < 8308.1144
Microsoft · Skype for Business Server 2019 CU5
- affected 1.0 – < 2046.369
Microsoft · Skype for Business Server 2015 CU11
- affected 2015 CU11 – < 9319.606
References (1)
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26422 (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2021-26422)Record last updated .