Vulnerability Description
LiteSpeed QUIC (LSQUIC) Library before 4.3.1 has an lsquic_engine_packet_in memory leak.
CVSS Score
5.3
MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Litespeedtech | Litespeed Web Adc | < 3.3.1 |
| Litespeedtech | Litespeed Web Server | < 6.3.4 |
| Litespeedtech | Lsquic | < 4.3.1 |
| Litespeedtech | Openlitespeed | < 1.8.4 |
Related Weaknesses (CWE)
References
- https://blog.litespeedtech.com/2025/08/18/litespeed-security-update/Vendor Advisory
- https://github.com/litespeedtech/lsquic/blob/70486141724f85e97b08f510673e29f399bRelease Notes
- https://github.com/litespeedtech/lsquic/commit/4cd9252e77fb4a36b572e2167a84067d6Release Notes
- https://www.imperva.com/blog/quic-leak-cve-2025-54939-new-high-risk-pre-handshakExploitThird Party Advisory
FAQ
What is CVE-2025-54939?
CVE-2025-54939 is a vulnerability with a CVSS score of 5.3 (MEDIUM). LiteSpeed QUIC (LSQUIC) Library before 4.3.1 has an lsquic_engine_packet_in memory leak.
How severe is CVE-2025-54939?
CVE-2025-54939 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-54939?
Check the references section above for vendor advisories and patch information. Affected products include: Litespeedtech Litespeed Web Adc, Litespeedtech Litespeed Web Server, Litespeedtech Lsquic, Litespeedtech Openlitespeed.