CVE-2025-54939

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2025-08-01. NVD baseline CVSS 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 5.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
24(Track)
EG Risk 24/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity53% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
54%
KEV
Not listed

Published

August 1, 2025

Last Modified

August 27, 2025

References (4)

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 33× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 155 total refreshes for this CVE.

  1. 2026-09-20 20:15 UTCEPSS rescore
  2. 2026-09-20 20:15 UTCEPSS rescore
  3. 2026-09-19 15:42 UTCEPSS rescore
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  10. 2026-09-13 05:35 UTCOSV refresh
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  1. 2026-08-27 14:24 UTCEPSS rescore
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  4. 2026-08-25 06:37 UTCOSV refresh
  5. 2026-08-24 14:16 UTCEPSS rescore
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  22. 2026-08-09 00:19 UTCOSV refresh
  23. 2026-08-08 16:36 UTCEPSS rescore
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  39. 2026-07-23 23:41 UTCOSV refresh
  40. 2026-07-23 14:18 UTCEPSS rescore
  41. 2026-07-23 02:58 UTCEG score recompute
  42. 2026-07-22 14:08 UTCEPSS rescore
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  44. 2026-07-21 15:24 UTCEPSS rescore
  45. 2026-07-20 17:08 UTCEPSS rescore
  46. 2026-07-19 14:30 UTCEPSS rescore
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  50. 2026-07-16 17:02 UTCEPSS rescore
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  55. 2026-07-13 22:29 UTCEPSS rescore
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  61. 2026-07-09 19:09 UTCEPSS rescore
  62. 2026-07-08 15:15 UTCEPSS rescore
  63. 2026-07-07 13:45 UTCEPSS rescore
  64. 2026-07-06 17:51 UTCOSV refresh
  65. 2026-07-06 16:27 UTCEPSS rescore
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  73. 2026-06-30 23:22 UTCEPSS rescore
  74. 2026-06-29 14:06 UTCEPSS rescore
  75. 2026-06-29 14:06 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2025-54939?
CVE-2025-54939 is a medium vulnerability published on August 1, 2025. LiteSpeed QUIC (LSQUIC) Library before 4.3.1 has an lsquicenginepacket_in memory leak.
When was CVE-2025-54939 disclosed?
CVE-2025-54939 was first published in the National Vulnerability Database on August 1, 2025, with the most recent update on August 27, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-54939 actively exploited?
CVE-2025-54939 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 45.8% of all scored CVEs.
What is the CVSS score of CVE-2025-54939?
CVE-2025-54939 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2025-54939?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-54939, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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