CVE-2026-66307
HighCVSS 7.5Summary
Integer underflow (wrap or wraparound) in Skype for Business allows an unauthorized attacker to deny service over a network.
Risk Assessment
Risk includes service disruption, potentially leading to unavailability of communication for users. Attack can be performed remotely.
Recommendation
Apply security updates for Skype for Business. Monitor service availability and respond to unusual network events.
Other vulnerabilities in Skype for Business
See all- CVE-2026-69646High
Improper verification of cryptographic signature in Skype for Business allows an unauthorized attacker to perform spoofing over an adjacent network.
- CVE-2026-66305High
Use of client-side authentication in Skype for Business allows an authorized attacker to perform spoofing over a network.
- CVE-2026-66304High
Server-side request forgery (SSRF) in Skype for Business allows an unauthorized attacker to disclose information over a network.
- CVE-2026-66302Critical
External control of file name or path in Skype for Business allows an unauthorized attacker to execute code over a network.
- CVE-2024-20695Medium
A vulnerability in Skype for Business allows information disclosure.
Original NVD description (English source)
Integer underflow (wrap or wraparound) in Skype for Business allows an unauthorized attacker to deny service over a network.