{"id":"CVE-2025-23109","title":"Long hostnames in URLs could be leveraged to obscure the actual host of the website or spoof the website address","summary":"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.","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","cwe":["CWE-346"],"vendor":"mozilla","product":"firefox","affected":["firefox < 134.0"],"patched":["firefox 134.0"],"published":"2025-01-11","updated":"2026-09-30","sourceUpdated":"2026-09-30T19:10:01.007","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-23109","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1419275","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-06/","label":"security@mozilla.org"}],"tags":["nvd"],"epss":0.00181,"epssPercentile":0.06934,"ingestedAt":"2026-09-30T19:21:07.222Z","slug":"CVE-2025-23109","body":"## Overview\n\nLong 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.\n\n## Affected\n\n- `firefox < 134.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `firefox 134.0`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}