CVE-2024-45396: Quicly assertion failures

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-10-11 · updated 2026-06-17
Weakness: CWE-617

Description

Quicly is an IETF QUIC protocol implementation. Quicly up to commtit d720707 is susceptible to a denial-of-service attack. A remote attacker can exploit these bugs to trigger an assertion failure that crashes process using quicly. The vulnerability is addressed with commit 2a95896104901589c495bc41460262e64ffcad5c.

Affected products

Dena Quicly: before 2024-10-10 — fixed in 2024-10-10

How to fix

Upgrade to a fixed version: Dena Quicly 2024-10-10. Check the vendor advisory for mitigations.

References

https://github.com/h2o/quicly/commit/2a95896104901589c495bc41460262e64ffcad5c
https://github.com/h2o/quicly/security/advisories/GHSA-mp3c-h5gg-mm6p

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