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QUIC in HAProxy 3.1.x before 3.1-dev7, 3.0.x before 3.0.5, and 2.9.x before 2.9.11 allows opening a 0-RTT session with a spoofed IP address. This can bypass the IP allow/block list functionality.

🗓️ 02 Oct 2025 06:11:34Reported by MicrosoftType 
mscve
 mscve
🔗 msrc.microsoft.com👁 7 Views

Quic in HAProxy enables zero round trip with a spoofed address, bypassing the allow list.

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02 Oct 2025 06:11Current
7High risk
Vulners AI Score7
CVSS 3.15.3
EPSS0.00105
SSVC
7