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Vulnerability record · CVE-2025-54939 · published 1 August 2025

CVE-2025-54939: Litespeedtech litespeed web adc allocation without limits vulnerability

Litespeedtech · Litespeed Web Adc

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

7.5 CVSS 3.1 High EPSS 0.81% · top 44.8% CWE-770 · Allocation without limitsCWE-401 · Memory leak
7.5CVSS 3.1 base score
0.81%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
4References, 1 tagged exploit
17 Jun 2026Last modified by NVD

Description

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://blog.litespeedtech.com/2025/08/18/litespeed-security-update/ Vendor Advisory
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-qui ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2024-25678Litespeedtech lsquic vulnerabilityIn LiteSpeed QUIC (LSQUIC) Library before 4.0.4, DCID validation is mishandled.EPSS 0.35%9.8CVE-2022-30592Litespeedtech lsquic null pointer dereference vulnerabilityliblsquic/lsquic_qenc_hdl.c in LiteSpeed QUIC (aka LSQUIC) before 3.1.0 mishandles MAX_TABLE_CAPACITY.EPSS 3.2%9.8CVE-2020-5519Litespeedtech openlitespeed improper input validation vulnerabilityThe WebAdmin Console in OpenLiteSpeed before v1.6.5 does not strictly check request URLs, as demonstrated by the "Server Configuration > External App…EPSS 1.2%8.8CVE-2022-0073Litespeedtech openlitespeed improper input validation vulnerabilityImproper Input Validation vulnerability in LiteSpeed Technologies OpenLiteSpeed Web Server and LiteSpeed Web Server dashboards allows Command Injecti…EPSS 8.8%8.8CVE-2022-0074Litespeedtech openlitespeed untrusted search path vulnerabilityUntrusted Search Path vulnerability in LiteSpeed Technologies OpenLiteSpeed Web Server and LiteSpeed Web Server Container allows Privilege Escalation…EPSS 1.2%8.8CVE-2021-26758Litespeedtech openlitespeed improper privilege management vulnerabilityPrivilege Escalation in LiteSpeed Technologies OpenLiteSpeed web server version 1.7.8 allows attackers to gain root terminal access and execute comma…EPSS 2.7%8.6CVE-2026-31386Litespeedtech litespeed web server os command injection vulnerabilityOpenLiteSpeed and LSWS Enterprise provided by LiteSpeed Technologies contain an OS command injection vulnerability. An arbitrary OS command may be ex…EPSS 2.1%7.5CVE-2023-40518Litespeedtech openlitespeed vulnerabilityLiteSpeed OpenLiteSpeed before 1.7.18 does not strictly validate HTTP request headers.EPSS 0.65%

Source: NIST National Vulnerability Database (record CVE-2025-54939), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.