What is CVE-2025-54939?

CVE-2025-54939 is a medium-severity vulnerability in Litespeedtech Litespeed_web_adc, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 5.3/10. Published 2025-08-01.

How severe is CVE-2025-54939?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Is CVE-2025-54939 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Resource exhaustion in Litespeedtech Litespeed_web_adc

CVE-2025-54939

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

EPSS: 0.008 (51.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

cve@mitre.org (Release Notes)
cve@mitre.org (Release Notes)
cve@mitre.org (Exploit, Third Party Advisory)
cve@mitre.org (Vendor Advisory)

Frequently asked questions

What is CVE-2025-54939?: CVE-2025-54939 is a medium-severity vulnerability in Litespeedtech Litespeed_web_adc, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 5.3/10. Published 2025-08-01.
How severe is CVE-2025-54939?: Medium severity. CVSS v3 base score is 5.3 out of 10.
Is CVE-2025-54939 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.