CVE-2025-54939

Public Exploit

Description

LiteSpeed QUIC (LSQUIC) Library before 4.3.1 has an lsquic_engine_packet_in memory leak.

Categories

5.3
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.04%
Vendor Advisory litespeedtech.com
Affected: litespeedtech LSQUIC
Published at:
Updated at:

References

Link Tags
https://github.com/litespeedtech/lsquic/blob/70486141724f85e97b08f510673e29f399bbae8f/CHANGELOG#L1-L3 release notes
https://github.com/litespeedtech/lsquic/commit/4cd9252e77fb4a36b572e2167a84067d603d3b23 release notes
https://www.imperva.com/blog/quic-leak-cve-2025-54939-new-high-risk-pre-handshake-remote-denial-of-service-in-lsquic-quic-implementation/ third party advisory exploit
https://blog.litespeedtech.com/2025/08/18/litespeed-security-update/ vendor advisory

Frequently Asked Questions

What is the severity of CVE-2025-54939?
CVE-2025-54939 has been scored as a medium severity vulnerability.
How to fix CVE-2025-54939?
To fix CVE-2025-54939, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-54939 being actively exploited in the wild?
It is possible that CVE-2025-54939 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-54939?
CVE-2025-54939 affects litespeedtech LSQUIC.
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