CVE-2025-6507

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 13.0%, top 4% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 13%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

A vulnerability in the h2oai/h2o-3 repository allows attackers to exploit deserialization of untrusted data, potentially leading to arbitrary code execution and reading of system files. This issue affects the latest master branch version 3.47.0.99999. The vulnerability arises from the ability to bypass regular expression filters intended to prevent malicious parameter injection in JDBC connections. Attackers can manipulate spaces between parameters to evade detection, allowing for unauthorized file access and code execution. The vulnerability is addressed in version 3.46.0.8.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: 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
Severity98% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
13%
EPSS %ILE
96%
KEV
Not listed

Published

September 1, 2025

Last Modified

June 17, 2026

Advisory Details (2)

Auto-updated Jul 26, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

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github_commit

commit f714edd6b842 (h2oai/h2o-3)

Fix landed in h2oai/h2o-3 commit f714edd6b842 — awaiting tagged release

https://github.com/h2oai/h2o-3/commit/f714edd6b8429c7a7211b779b6ec108a95b7382d

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 45× 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 117 total refreshes for this CVE.

  1. 2026-07-26 14:54 UTCEPSS rescore
  2. 2026-07-26 14:54 UTCEPSS rescore
  3. 2026-07-25 14:17 UTCEPSS rescore
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  5. 2026-07-24 16:11 UTCOSV refresh
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  9. 2026-07-23 03:01 UTCEG score recompute
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  1. 2026-07-09 19:10 UTCEPSS rescore
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  3. 2026-07-07 13:46 UTCEPSS rescore
  4. 2026-07-07 11:21 UTCOSV refresh
  5. 2026-07-06 16:27 UTCEPSS rescore
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  30. 2026-06-19 19:25 UTCEPSS rescore
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  32. 2026-06-18 22:35 UTCOSV refresh
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  48. 2026-06-07 15:24 UTCEPSS rescore
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  50. 2026-06-06 13:47 UTCEPSS rescore
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  65. 2026-05-30 12:05 UTCOSV refresh
  66. 2026-05-29 13:44 UTCEPSS rescore
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  75. 2026-05-26 13:44 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2025-6507?
CVE-2025-6507 is a critical vulnerability published on September 1, 2025. A vulnerability in the h2oai/h2o-3 repository allows attackers to exploit deserialization of untrusted data, potentially leading to arbitrary code execution and reading of system files. This issue affects the latest master branch version 3.47.0.99999. The vulnerability arises from the ability to…
When was CVE-2025-6507 disclosed?
CVE-2025-6507 was first published in the National Vulnerability Database on September 1, 2025, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-6507 actively exploited?
CVE-2025-6507 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 13% probability of exploitation in the next 30 days, which ranks it in the top 4.1% of all scored CVEs.
What is the CVSS score of CVE-2025-6507?
CVE-2025-6507 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2025-6507?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-6507, 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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