{"id":"CVE-2023-29539","title":"When handling the filename directive in the Content-Disposition header, the filename would be truncated if the filename contained a NULL character","summary":"When handling the filename directive in the Content-Disposition header, the filename would be truncated if the filename contained a NULL character. This could have led to reflected file download attacks potentially tricking users to inst…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cwe":["CWE-476"],"vendor":"mozilla","product":"firefox","affected":["firefox < 112.0","firefox_esr < 102.10","firefox_mobile < 112.0","focus < 112.0","thunderbird < 102.10"],"patched":["firefox 112.0","firefox_esr 102.10","firefox_mobile 112.0","focus 112.0","thunderbird 102.10"],"published":"2023-06-02","updated":"2026-08-19","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2023-29539","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1784348","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2023-13/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2023-14/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2023-15/","label":"security@mozilla.org"},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1784348","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.mozilla.org/security/advisories/mfsa2023-13/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.mozilla.org/security/advisories/mfsa2023-14/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.mozilla.org/security/advisories/mfsa2023-15/","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00737,"epssPercentile":0.52582,"ingestedAt":"2026-08-19T15:41:15.583Z","slug":"CVE-2023-29539","body":"## Overview\n\nWhen handling the filename directive in the Content-Disposition header, the filename would be truncated if the filename contained a NULL character. This could have led to reflected file download attacks potentially tricking users to install malware. This vulnerability affects Firefox < 112, Focus for Android < 112, Firefox ESR < 102.10, Firefox for Android < 112, and Thunderbird < 102.10.\n\n## Affected\n\n- `firefox < 112.0`\n- `firefox_esr < 102.10`\n- `firefox_mobile < 112.0`\n- `focus < 112.0`\n- `thunderbird < 102.10`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `firefox 112.0`\n- `firefox_esr 102.10`\n- `firefox_mobile 112.0`\n- `focus 112.0`\n- `thunderbird 102.10`","depth":"twilight","depthScore":49,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}