CVE-2025-23109

MEDIUMNVD 6.56.5—

6.5

Long hostnames in URLs could be leveraged to obscure the actual host of the website or spoof the website address. This vulnerability was fixed in Firefox for iOS 134.

CVSS v3: 6.5
EG Score: 6.5(medium)
EPSS: 78.4%
KEV: Not listed

Published

January 11, 2025

Last Modified

April 13, 2026

References (2)

security@mozillahttps://bugzilla.mozilla.org/show_bug.cgi?id=1419275
security@mozillahttps://www.mozilla.org/security/advisories/mfsa2025-06/

Weakness Classification(1)

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

CWE-346Origin Validation Error

Data Freshness Timeline

(refreshed 13× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:12 UTCepss_batch
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2026-06-01 13:51 UTCepss_batch
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2026-05-31 22:30 UTCepss_batch
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2026-05-27 13:40 UTCepss_batch
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2026-05-26 13:43 UTCepss_batch
2026-05-26 13:43 UTCepss_batch

Frequently asked(5)

What is CVE-2025-23109?

CVE-2025-23109 is a medium vulnerability published on January 11, 2025. Long hostnames in URLs could be leveraged to obscure the actual host of the website or spoof the website address. This vulnerability was fixed in Firefox for iOS 134.

When was CVE-2025-23109 disclosed?

CVE-2025-23109 was first published in the National Vulnerability Database on January 11, 2025, with the most recent update on April 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2025-23109 actively exploited?

CVE-2025-23109 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 78.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2025-23109?

CVE-2025-23109 has a CVSS v3 base score of 6.5 (NVD).

How do I remediate CVE-2025-23109?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-23109, 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.

Dependency Blast Radius

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CVE-2025-23109

📅 Published

🔄 Last Modified

🔗 References (2)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2025-23109?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (2)

Frequently asked(5)

Related CVEs(same CWE)