CVE-2025-54939

highpriority · track · 40EPSS 0.008 · 56 %ileexploit · PoCEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

0.80% (56th) EPSS

CVSS 7.5 · high

Is it mine?

5 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-26

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

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5.3–7.5

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · ENISA EU

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · cve@mitre.org USexploitability 3.9 · impact 1.4

v3.17.1highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Psecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-401USprimaryCWE-770US

exploits (1)

Public proof-of-concept and weaponised exploit code.

yohannslm/CVE-2025-54939POC for CVE-2025-54939. ~ forcibly loads 200MiB/s in server's memoryPoC · poc_in_github

affected products (5)

Products and version ranges known to be affected.

litespeedtech LSQUIC0 → 4.3.1enisa_euvdEU
litespeedtech litespeed web adc< 3.3.1nvdUScpe:2.3:a:litespeedtech:litespeed_web_adc:*:*:*:*:*:*:*:*
litespeedtech litespeed web server< 6.3.4nvdUScpe:2.3:a:litespeedtech:litespeed_web_server:*:*:*:*:*:*:*:*
litespeedtech lsquic< 4.3.1nvdUScpe:2.3:a:litespeedtech:lsquic:*:*:*:*:*:*:*:*
litespeedtech openlitespeed< 1.8.4nvdUScpe:2.3:a:litespeedtech:openlitespeed:*:*:*:*:*:*:*:*

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2025-08-01modified 2026-06-17

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+3009 more

references (14)

External citations — patches, advisories, analysis.

scry

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