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High severity7.5NVD Advisory· Published Sep 8, 2026· Updated Sep 16, 2026

CVE-2026-66307

CVE-2026-66307

Description

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

Affected products

7
  • Microsoft/Skype For Businessllm-fuzzy6 versions
    (expand)+ 5 more
    • (no CPE)
    • cpe:2.3:a:microsoft:skype_for_business_server:2015:cumulative_update_13:*:*:*:*:*:*
    • cpe:2.3:a:microsoft:skype_for_business_server:2015:cumulative_update_13_hotfix_2:*:*:*:*:*:*
    • cpe:2.3:a:microsoft:skype_for_business_server:2019:cumulative_update_8:*:*:*:*:*:*
    • cpe:2.3:a:microsoft:skype_for_business_server:2019:cumulative_update_8_hotfix1:*:*:*:*:*:*
    • cpe:2.3:a:microsoft:skype_for_business_server:2019:cumulative_update_8_hotfix2:*:*:*:*:*:*
  • Microsoft/Skype For Business Server Subscription Edition
    cpe:2.3:a:microsoft:skype_for_business_server_subscription_edition:7.0.2046.849:*:*:*:*:*:*:*

Patches

Vulnerability mechanics

References

1

News mentions

2