CVE-2026-66303
MediumCVSS 6.5Exploitation Probability (EPSS)
Elevated risk55th percentile - higher than 55% of all known CVEs
Summary
A null pointer dereference vulnerability in Skype for Business allows an authorized attacker to deny service over a network.
Risk Assessment
Risk of application crash or hang, potentially leading to service unavailability.
Recommendation
Update Skype for Business to the latest patched version.
Other vulnerabilities in Skype for Business
See all- 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-2023-41763MediumActively exploited
Elevation of Privilege vulnerability in Skype for Business. Technical details are not available in the description.
- CVE-2026-69646High
Improper verification of cryptographic signature in Skype for Business allows an unauthorized attacker to perform spoofing over an adjacent network.
- CVE-2026-69642Medium
A cross-site scripting (XSS) vulnerability in Skype for Business allows an unauthorized attacker to perform spoofing over a network.
- CVE-2026-66308Medium
An out-of-bounds read vulnerability in Skype for Business allows an authorized attacker to deny service over a network.
- CVE-2026-66307High
Integer underflow (wrap or wraparound) in Skype for Business allows an unauthorized attacker to deny service over a network.
- CVE-2026-66306Medium
A vulnerability in Skype for Business that generates error messages containing sensitive information allows an unauthorized attacker to disclose information over a 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-2026-63523Medium
A cross-site scripting (XSS) vulnerability in Skype for Business allows an unauthorized attacker to perform spoofing over a network.
Original NVD description (English source)
Null pointer dereference in Skype for Business allows an authorized attacker to deny service over a network.