CVE-2026-66307
Skype for Business and Lync Denial of Service vulnerability
MSRC advisory September 8, 2026
Alert details
- Source feed
- Microsoft MSRC
- CVE ID
- CVE-2026-66307
- Affected products
- Skype for Business and Lync Denial of Service · Microsoft Skype for Business and Lync Denial of Service · Microsoft
What happened
<p>Integer underflow (wrap or wraparound) in Skype for Business allows an unauthorized attacker to deny service over a network.</p>
What it means for your business
Skype for Business and Lync Denial of Service vulnerability (CVE-2026-66307) was added to Microsoft’s security update guidance. <p>Integer underflow (wrap or wraparound) in Skype for Business allows an unauthorized attacker to deny service over a network.</p> If you need help checking exposure, call (864) 335-9223.
EPSS probability
1.17%
Sources
Related briefs
Windows Internet Information Services Denial of Service vulnerability
Windows Internet Information Services Denial of Service vulnerability (CVE-2026-97830) was added to Microsoft’s security update guidance. <p>Double free in Windows Internet Information Services allows an unauthorized attacker to deny service over a network.</p> If you need help checking exposure, call (864) 335-9223.
Microsoft OpenSSH for Windows Remote Code Execution vulnerability
Microsoft OpenSSH for Windows Remote Code Execution vulnerability (CVE-2026-97816) was added to Microsoft’s security update guidance. <p>Use after free in OpenSSH for Windows allows an unauthorized attacker to execute code over a network.</p> If you need help checking exposure, call (864) 335-9223.
Windows Error Reporting Remote Code Execution vulnerability
Windows Error Reporting Remote Code Execution vulnerability (CVE-2026-97815) was added to Microsoft’s security update guidance. <p>Heap-based buffer overflow in Windows Error Reporting allows an unauthorized attacker to execute code over a network.</p> If you need help checking exposure, call (864) 335-9223.
Windows Text Shaping Remote Code Execution vulnerability
Windows Text Shaping Remote Code Execution vulnerability (CVE-2026-97814) was added to Microsoft’s security update guidance. <p>Heap-based buffer overflow in Windows Text Shaping allows an unauthorized attacker to execute code over a network.</p> If you need help checking exposure, call (864) 335-9223.
Need help patching?
PremierePC monitors KEV alerts for managed clients and helps teams prioritize remediation before attackers do.