What is CVE-2024-45396?

CVE-2024-45396 is a high-severity vulnerability in Dena Quicly, classified under Reachable Assertion. CVSS score: 7.5/10. Published 2024-10-11.

How severe is CVE-2024-45396?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2024-45396 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Dena Quicly

CVE-2024-45396

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.

Published 2024-10-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.006 (45.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Dena Quicly
H2o Quicly — versions < 2a95896104901589c495bc41460262e64ffcad5c

Weakness classification (CWE)

CWE-617 — Reachable Assertion

Public proof-of-concept exploits

References

github.com/h2o/quicly/security/advisories/GHSA-mp3c-h5gg-mm6p (Vendor Advisory)
github.com/h2o/quicly/commit/2a95896104901589c495bc41460262e64ffcad5c (Patch)

Frequently asked questions

What is CVE-2024-45396?: CVE-2024-45396 is a high-severity vulnerability in Dena Quicly, classified under Reachable Assertion. CVSS score: 7.5/10. Published 2024-10-11.
How severe is CVE-2024-45396?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2024-45396 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.