{"id":"CVE-2020-26977","title":"By attempting to connect a website using an unresponsive port, an attacker could have controlled the content of a tab while the URL bar displayed the original domain","summary":"By attempting to connect a website using an unresponsive port, an attacker could have controlled the content of a tab while the URL bar displayed the original domain. *Note: This issue only affects Firefox for Android. Other operating sy…","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","vendor":"mozilla","product":"firefox_mobile","affected":["firefox_mobile < 84.0"],"patched":["firefox_mobile 84.0"],"published":"2021-01-07","updated":"2026-08-19","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2020-26977","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1676311","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2020-54/","label":"security@mozilla.org"},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1676311","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.mozilla.org/security/advisories/mfsa2020-54/","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00851,"epssPercentile":0.56213,"ingestedAt":"2026-08-19T15:41:15.154Z","slug":"CVE-2020-26977","body":"## Overview\n\nBy attempting to connect a website using an unresponsive port, an attacker could have controlled the content of a tab while the URL bar displayed the original domain. *Note: This issue only affects Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 84.\n\n## Affected\n\n- `firefox_mobile < 84.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `firefox_mobile 84.0`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}