CVE-2026-66307: Skype for Business and Lync Denial of Service Vulnerability
Microsoft · Skype for Business Server 2015 CU13
Vendor fix available · Affected: Microsoft Skype for Business Server 2015 CU13 · Exploitation: possible (1 to 10%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 68% of scored CVEs
DescriptionCVE.org
Integer underflow (wrap or wraparound) in Skype for Business allows an unauthorized attacker to deny service over a network.
Affected products3
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Microsoft · Skype for Business Server 2015 CU13from 9319.0 before 6.0.9319.885
- Microsoft · Skype for Business Server 2019 CU8from 2046.0 before 7.0.2046.569
- Microsoft · Skype for Business Server Subscription Edition CU1from 2046.0 before 7.0.2046.879
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Possible (1 to 10%). EPSS between 1% and 10%.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- Microsoft
- Published
- September 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-66307 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.