{"id":"CVE-2025-5020","title":"Opening maliciously-crafted URLs in Firefox from other apps such as Safari could have allowed attackers to spoof website addresses if the URLs utilized non-HTTP schemes used internally by the Firefox iOS client","summary":"Opening maliciously-crafted URLs in Firefox from other apps such as Safari could have allowed attackers to spoof website addresses if the URLs utilized non-HTTP schemes used internally by the Firefox iOS client. This vulnerability was fi…","severity":"medium","cvss":4.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","cwe":["CWE-939"],"vendor":"mozilla","product":"firefox","affected":["firefox < 139.0"],"patched":["firefox 139.0"],"published":"2025-05-21","updated":"2026-09-30","sourceUpdated":"2026-09-30T18:10:00.190","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-5020","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1951558","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-39/","label":"security@mozilla.org"}],"tags":["nvd"],"epss":0.00226,"epssPercentile":0.12002,"ingestedAt":"2026-09-30T18:17:24.438Z","slug":"CVE-2025-5020","body":"## Overview\n\nOpening maliciously-crafted URLs in Firefox from other apps such as Safari could have allowed attackers to spoof website addresses if the URLs utilized non-HTTP schemes used internally by the Firefox iOS client. This vulnerability was fixed in Firefox for iOS 139.\n\n## Affected\n\n- `firefox < 139.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `firefox 139.0`","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":23.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}