VDB

CVE-2026-66307

CVE-2026-66307 PUBLISHED CVSS 7.5 HIGH

Reported by microsoft · Published September 8, 2026

Integer underflow (wrap or wraparound) in Skype for Business allows an unauthorized attacker to deny service over a network.

Risk Scores

CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

Affected Products

VendorProductVersions
MicrosoftSkype for Business Server 2015 CU139319.0
MicrosoftSkype for Business Server 2019 CU82046.0
MicrosoftSkype for Business Server Subscription Edition CU12046.0
MicrosoftSkype for Business Server 2015 CU139319.0
microsoftskype_for_business_server_20159319.0
microsoftskype_for_business_server_subscription_edition2046.0
MicrosoftSkype for Business Server 2019 CU82046.0
MicrosoftSkype for Business Server Subscription Edition CU12046.0
microsoftskype_for_business_server_20192046.0

Timeline

  • Sep 8, 2026 CVE Published
  • Sep 8, 2026 CVE Updated
  • Sep 9, 2026 Coalition ESS Score
  • Sep 9, 2026 Security Advisory

References

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