Skype for Business and Lync Remote Code Execution Vulnerability
Priority LOW 36Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
Skype for Business and Lync Remote Code Execution Vulnerability
Why it matters now
EPSS 0.02219 82nd percentileScored 2026-11-07
Fix Fixed Microsoft Lync Server 2013 CU10 (Microsoft): 8308.1144Skype for Business Server 2019 CU5 (Microsoft): 2046.369+1 more product
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Microsoft | Microsoft Lync Server 2013 CU10 | 8308.0 to before 8308.1144 | 8308.1144 | Patch available | CNA |
| Microsoft | Skype for Business Server 2019 CU5 | 1.0 to before 2046.369 | 2046.369 | Patch available | CNA |
| Microsoft | Skype for Business Server 2015 CU11 | 2015 CU11 to before 9319.606 | 9319.606 | Patch available | CNA |
- Microsoft Lync Server 2013 CU10 VendorMicrosoft Affected 8308.0 to before 8308.1144 Fixed in 8308.1144 Patch available CNA
- Skype for Business Server 2019 CU5 VendorMicrosoft Affected 1.0 to before 2046.369 Fixed in 2046.369 Patch available CNA
- Skype for Business Server 2015 CU11 VendorMicrosoft Affected 2015 CU11 to before 9319.606 Fixed in 9319.606 Patch available CNA
CPE configurations NVD · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:microsoft:lync_server:2013:cumulative_update_10:*:*:*:*:*:* | 2013 cumulative_update_10 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:skype_for_business_server:2015:cumulative_update_11:*:*:*:*:*:* | 2015 cumulative_update_11 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:skype_for_business_server:2019:cumulative_update_5:*:*:*:*:*:* | 2019 cumulative_update_5 | Vulnerable | Microsoft |
- cpe:2.3:a:microsoft:lync_server:2013:cumulative_update_10:*:*:*:*:*:* Versions 2013 cumulative_update_10 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:skype_for_business_server:2015:cumulative_update_11:*:*:*:*:*:* Versions 2015 cumulative_update_11 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:skype_for_business_server:2019:cumulative_update_5:*:*:*:*:*:* Versions 2019 cumulative_update_5 Vulnerable ·Microsoft
Remediation
- Fix · CNA Microsoft Lync Server 2013 CU10 (Microsoft) Fixed in 8308.1144
- Fix · CNA Skype for Business Server 2019 CU5 (Microsoft) Fixed in 2046.369
- Fix · CNA Skype for Business Server 2015 CU11 (Microsoft) Fixed in 9319.606
Timeline
- 2026-10-02 Threatist record created from CVE-2021-26422
- 2026-10-03 Alias added: GHSA-322h-m7q9-7x4q
More Microsoft Lync Server vulnerabilities
- TI-2013-01140 Microsoft Communicator 2007 R2, Lync 2010, Lync 2010 Attendee, and Lync Server 2013 do… CVSS 2.0HIGH 9.3
- TI-2014-01426 Cross-site scripting (XSS) vulnerability in the Web Components Server in Microsoft Lync… CVSS 2.0MEDIUM 4.3
- TI-2014-03321 The Server in Microsoft Lync Server 2013 allows remote attackers to cause a denial of… CVSS 2.0MEDIUM 5.0
- TI-2014-03319 The Response Group Service in Microsoft Lync Server 2010 and 2013 and the Core Components… CVSS 2.0MEDIUM 5.0
- TI-2022-14751 Skype for Business and Lync Remote Code Execution Vulnerability CVSS 3.1HIGH 7.2
- TI-2022-10143 Skype for Business Information Disclosure Vulnerability CVSS 3.1MEDIUM 6.5
Sources
- CVE-2021-26422 · CVE Program
- CVE-2021-26422 · NVD
- FIRST EPSS
- GHSA-322h-m7q9-7x4q · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences