{"schemaVersion":3,"id":"CVE-2025-5269","aliases":["UBUNTU-CVE-2025-5269","DEBIAN-CVE-2025-5269","CGA-cgqw-783p-vxxg","CGA-rj2x-5jg5-8w9g","CGA-4693-9qq5-2mw6","CGA-93cc-3r2g-cr66"],"status":"published","duplicateOf":null,"title":null,"description":"Memory safety bug present in Firefox ESR 128.10, and Thunderbird 128.10. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox ESR 128.11 and Thunderbird 128.11.","dates":{"published":"2025-05-27T12:29:27.780Z","modified":"2026-04-13T14:29:15.660Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":8.1,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":8.1,"severity":"high","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":8.1,"severity":"high","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":5.6,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":8.1,"severity":"high","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":5.6,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Wolfi","score":8.1,"severity":"high","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":5.6,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Chainguard","score":8.1,"severity":"high","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":5.6,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":8.1,"severity":"high","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00463,"percentile":0.38779,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.00463},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00463,"percentile":0.38779}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00463,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00463,"percentile":0.38779}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-787","name":"Out-of-bounds Write","description":"The product writes data past the end, or before the beginning, of the intended buffer.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/787.html"}],"affected":[{"vendor":"chainguard","product":"firefox","name":"firefox","label":"firefox","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/firefox","purlType":"apk","versions":[{"text":"< 128.11-r0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 128.11-r0","eol":null,"hubHref":null},{"vendor":"chainguard","product":"firefox-esr","name":"firefox-esr","label":"firefox-esr","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/firefox-esr","purlType":"apk","versions":[{"text":"< 128.11-r0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 128.11-r0","eol":null,"hubHref":null},{"vendor":"wolfi","product":"firefox","name":"firefox","label":"firefox","ecosystem":"Wolfi","cpePart":null,"purl":"pkg:apk/wolfi/firefox","purlType":"apk","versions":[{"text":"< 128.11-r0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 128.11-r0","eol":null,"hubHref":null},{"vendor":"debian","product":"firefox-esr","name":"firefox-esr","label":"firefox-esr","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/firefox-esr","purlType":"deb","versions":[{"text":"< 128.11.0esr-1~deb12u1","noFixRecorded":false,"fixedIn":null},{"text":"< 128.11.0esr-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 128.11.0esr-1~deb12u1 | < 128.11.0esr-1","eol":null,"hubHref":null},{"vendor":"debian","product":"thunderbird","name":"thunderbird","label":"thunderbird","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/thunderbird","purlType":"deb","versions":[{"text":"< 1:128.11.0esr-1~deb12u1","noFixRecorded":false,"fixedIn":null},{"text":"< 1:128.11.0esr-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1:128.11.0esr-1~deb12u1 | < 1:128.11.0esr-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"thunderbird","name":"thunderbird","label":"thunderbird","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/thunderbird","purlType":"deb","versions":[{"text":"< 1:128.12.0+build1-0ubuntu0.22.04.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1:128.12.0+build1-0ubuntu0.22.04.1","eol":null,"hubHref":null},{"vendor":"mozilla","product":"firefox","name":"Firefox","label":"firefox","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 128.11.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 128.11.0","eol":{"isEol":null,"eolDate":null,"matchMethod":"cpe","cycle":null,"product":{"name":"firefox","label":"Firefox","category":"app"}},"hubHref":"/vendor/mozilla/firefox"},{"vendor":"mozilla","product":"thunderbird","name":"Thunderbird","label":"thunderbird","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 128.11.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 128.11.0","eol":null,"hubHref":"/vendor/mozilla/thunderbird"}],"affectedCount":8,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1924108","label":"bugzilla.mozilla.org/show_bug.cgi?id=1924108","hostname":"bugzilla.mozilla.org","tags":["REPORT","Permissions Required"]},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-44/","label":"www.mozilla.org/security/advisories/mfsa2025-44/","hostname":"www.mozilla.org","tags":["Advisory","Vendor Advisory"]},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-46/","label":"www.mozilla.org/security/advisories/mfsa2025-46/","hostname":"www.mozilla.org","tags":["Advisory"]},{"url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00046.html","label":"lists.debian.org/debian-lts-announce/2025/05/msg00046.html","hostname":"lists.debian.org","tags":["WEB"]},{"url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00043.html","label":"lists.debian.org/debian-lts-announce/2025/05/msg00043.html","hostname":"lists.debian.org","tags":["WEB"]},{"url":"https://ubuntu.com/security/CVE-2025-5269","label":"ubuntu.com/security/CVE-2025-5269","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-5269","label":"www.cve.org/CVERecord?id=CVE-2025-5269","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://www.mozilla.org/en-US/security/advisories/mfsa2025-44/#CVE-2025-5269","label":"www.mozilla.org/en-US/security/advisories/mfsa2025-44/","hostname":"www.mozilla.org","tags":["REPORT"]},{"url":"https://www.mozilla.org/en-US/security/advisories/mfsa2025-46/#CVE-2025-5269","label":"www.mozilla.org/en-US/security/advisories/mfsa2025-46/","hostname":"www.mozilla.org","tags":["REPORT"]},{"url":"https://ubuntu.com/security/notices/USN-7663-1","label":"ubuntu.com/security/notices/USN-7663-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2025-5269","label":"security-tracker.debian.org/tracker/CVE-2025-5269","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["DLA-4191-1","DLA-4194-1","DSA-5926-1","DSA-5932-1","MGASA-2025-0195","MGASA-2025-0197","OPENSUSE-SU-2025-20135-1","OPENSUSE-SU-2025:15170-1","OPENSUSE-SU-2025:15174-1","OPENSUSE-SU-2025:15315-1","OPENSUSE-SU-2025:20135-1","RHSA-2025:8293","RHSA-2025:8308","RHSA-2025:8341","RHSA-2025:8598","RHSA-2025:8599","RHSA-2025:8607","RHSA-2025:8608","RHSA-2025:8628","RHSA-2025:8629","RHSA-2025:8630","RHSA-2025:8631","RHSA-2025:8642","RHSA-2025:8756","RHSA-2025:9071","RHSA-2025:9072","RHSA-2025:9073","RHSA-2025:9074","RHSA-2025:9075","RHSA-2025:9076","RHSA-2025:9077","RHSA-2025:9155","SUSE-SU-2025:01769-1","SUSE-SU-2025:01814-1","SUSE-SU-2025:01946-1","SUSE-SU-2025:21170-1","USN-7663-1"],"duplicates":[],"related":["CGA-5H68-PG33-4GH7","OPENSUSE-SU-2025-20135-1","OPENSUSE-SU-2025:15170-1","OPENSUSE-SU-2025:15174-1","OPENSUSE-SU-2025:15315-1","OPENSUSE-SU-2025:20135-1","SUSE-SU-2025:01769-1","SUSE-SU-2025:01814-1","SUSE-SU-2025:01946-1","SUSE-SU-2025:21170-1","USN-7663-1"]},"timeline":[{"kind":"published","date":"2025-05-27T12:29:27.780Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-04-13T14:29:15.660Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":32,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T13:11:22.133Z","stale":false,"partial":false}}