Description
Integer underflow (wrap or wraparound) in Skype for Business allows an unauthorized attacker to deny service over a network.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Microsoft | Skype for Business Server 2015 CU13 | 9319.0 – < 6.0.9319.885 | 6.0.9319.885 |
| Microsoft | Skype for Business Server 2019 CU8 | 2046.0 – < 7.0.2046.569 | 7.0.2046.569 |
| Microsoft | Skype for Business Server Subscription Edition CU1 | 2046.0 – < 7.0.2046.879 | 7.0.2046.879 |
Advisories 3
- WID-SEC-2026-3234 Microsoft Office Produkte: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 8, 2026
- NCSC-2026-0352 Kwetsbaarheden verholpen in Microsoft Office NCSC-NL (Netherlands) · Sep 8, 2026
- MSRC-CVE-2026-66307 Skype for Business and Lync Denial of Service Vulnerability Microsoft Security Response Center · Sep 8, 2026
References
- Skype for Business and Lync Denial of Service Vulnerability vendor-advisory patch