CVE-2021-26422
Skype for Business and Lync Remote Code Execution Vulnerability
Skype for Business and Lync Remote Code Execution Vulnerability
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- High
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Skype for Business and Lync Remote Code Execution Vulnerability
Skype for Business and Lync Remote Code Execution Vulnerability
- Record
CVE-2021-26422- CVSS 3.1
- 7.2 High
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 - Updated
- 2026-11-02
EUVDEUVD-2021-13228
Skype for Business and Lync Remote Code Execution Vulnerability
- Record
EUVD-2021-13228- CVSS 3.1
- 7.2 High
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 - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-322h-m7q9-7x4q
Skype for Business and Lync Remote Code Execution Vulnerability
Skype for Business and Lync Remote Code Execution Vulnerability
- Record
GHSA-322h-m7q9-7x4q- CVSS 3.1
- 7.2 High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-77
- Updated
- 2026-11-02
NVD
Skype for Business and Lync Remote Code Execution Vulnerability
- Record
CVE-2021-26422- CVSS 3.1
- 7.2 High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 6.5 Medium
AV:N/AC:L/Au:S/C:P/I:P/A:P - Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-26422 is a high vulnerability (CVSS 7.2) in Microsoft Lync Server, published May 11, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.22%, the 82nd percentile. No source names a fixed version.