CVE-2025-54939
LiteSpeed QUIC (LSQUIC) Library LSQUIC Engine Packet In Memory Leak
Description
LiteSpeed QUIC (LSQUIC) Library before 4.3.1 has an lsquic_engine_packet_in memory leak.
INFO
Published Date :
Aug. 1, 2025, 6:15 a.m.
Last Modified :
Aug. 27, 2025, 3:52 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2025-54939
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update LSQUIC library to version 4.3.1 or later.
- Apply vendor patches if available.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-54939.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-54939 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-54939
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-54939 vulnerability anywhere in the article.
-
The Hacker News
⚡ Weekly Recap: WhatsApp 0-Day, Docker Bug, Salesforce Breach, Fake CAPTCHAs, Spyware App & More
Cybersecurity today is less about single attacks and more about chains of small weaknesses that connect into big risks. One overlooked update, one misused account, or one hidden tool in the wrong hand ... Read more
-
CybersecurityNews
New QUIC-LEAK Vulnerability Let Attackers Exhaust Server Memory and Trigger DoS Attack
A critical pre-handshake vulnerability in the LSQUIC QUIC implementation that allows remote attackers to crash servers through memory exhaustion attacks. The vulnerability, designated CVE-2025-54939 a ... Read more
The following table lists the changes that have been made to the
CVE-2025-54939 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Reanalysis by [email protected]
Aug. 27, 2025
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:litespeedtech:litespeed_web_adc:*:*:*:*:*:*:*:* versions up to (excluding) 3.3.1 *cpe:2.3:a:litespeedtech:litespeed_web_server:*:*:*:*:*:*:*:* versions up to (excluding) 6.3.4 *cpe:2.3:a:litespeedtech:openlitespeed:*:*:*:*:*:*:*:* versions up to (excluding) 1.8.4 OR *cpe:2.3:a:litespeedtech:litespeed_web_adc:*:*:*:*:*:*:*:* versions up to (excluding) 3.3.1 *cpe:2.3:a:litespeedtech:litespeed_web_server:*:*:*:*:*:*:*:* versions up to (excluding) 6.3.4 *cpe:2.3:a:litespeedtech:openlitespeed:*:*:*:*:*:*:*:* versions up to (excluding) 1.8.4 *cpe:2.3:a:litespeedtech:lsquic:*:*:*:*:*:*:*:* versions up to (excluding) 4.3.1 -
Initial Analysis by [email protected]
Aug. 27, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-401 Added CPE Configuration OR *cpe:2.3:a:litespeedtech:litespeed_web_adc:*:*:*:*:*:*:*:* versions up to (excluding) 3.3.1 *cpe:2.3:a:litespeedtech:litespeed_web_server:*:*:*:*:*:*:*:* versions up to (excluding) 6.3.4 *cpe:2.3:a:litespeedtech:openlitespeed:*:*:*:*:*:*:*:* versions up to (excluding) 1.8.4 Added Reference Type MITRE: https://blog.litespeedtech.com/2025/08/18/litespeed-security-update/ Types: Vendor Advisory Added Reference Type MITRE: https://github.com/litespeedtech/lsquic/blob/70486141724f85e97b08f510673e29f399bbae8f/CHANGELOG#L1-L3 Types: Release Notes Added Reference Type MITRE: https://github.com/litespeedtech/lsquic/commit/4cd9252e77fb4a36b572e2167a84067d603d3b23 Types: Release Notes Added Reference Type MITRE: https://www.imperva.com/blog/quic-leak-cve-2025-54939-new-high-risk-pre-handshake-remote-denial-of-service-in-lsquic-quic-implementation/ Types: Exploit, Third Party Advisory -
CVE Modified by [email protected]
Aug. 20, 2025
Action Type Old Value New Value Added Reference https://blog.litespeedtech.com/2025/08/18/litespeed-security-update/ -
CVE Modified by [email protected]
Aug. 19, 2025
Action Type Old Value New Value Added Reference https://www.imperva.com/blog/quic-leak-cve-2025-54939-new-high-risk-pre-handshake-remote-denial-of-service-in-lsquic-quic-implementation/ -
New CVE Received by [email protected]
Aug. 01, 2025
Action Type Old Value New Value Added Description LiteSpeed QUIC (LSQUIC) Library before 4.3.1 has an lsquic_engine_packet_in memory leak. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Added CWE CWE-770 Added Reference https://github.com/litespeedtech/lsquic/blob/70486141724f85e97b08f510673e29f399bbae8f/CHANGELOG#L1-L3 Added Reference https://github.com/litespeedtech/lsquic/commit/4cd9252e77fb4a36b572e2167a84067d603d3b23