{"schemaVersion":3,"id":"CVE-2020-6831","aliases":["UBUNTU-CVE-2020-6831","DEBIAN-CVE-2020-6831"],"status":"published","duplicateOf":null,"title":null,"description":"A buffer overflow could occur when parsing and validating SCTP chunks in WebRTC. This could have led to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0.","dates":{"published":"2020-05-26T17:05:57.000Z","modified":"2024-08-04T09:11:05.112Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":9.8,"severity":"critical","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/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":"OSV · Ubuntu","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":10,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":10,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":7.5,"severity":"high","vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.05803,"percentile":0.9305,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.05803},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.05803,"percentile":0.9305}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.05803,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.05803,"percentile":0.9305}]},"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":"canonical","product":"ubuntu_linux","name":"ubuntu linux","label":"ubuntu_linux","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"16.04","noFixRecorded":false,"fixedIn":null},{"text":"18.04","noFixRecorded":false,"fixedIn":null},{"text":"19.10","noFixRecorded":false,"fixedIn":null},{"text":"20.04","noFixRecorded":false,"fixedIn":null}],"versionsText":"16.04 | 18.04 | 19.10 | 20.04","eol":{"isEol":true,"eolDate":"2021-04-02T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"16.04","label":"16.04 'Xenial Xerus' (LTS)","eolFrom":"2021-04-02T00:00:00.000Z","isLts":true,"isMaintained":false,"latestVersion":"16.04.7"},"product":{"name":"ubuntu","label":"Ubuntu","category":"os"}},"hubHref":"/vendor/canonical/ubuntu_linux"},{"vendor":"debian","product":"chromium","name":"chromium","label":"chromium","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/chromium","purlType":"deb","versions":[{"text":"< 83.0.4103.83-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 83.0.4103.83-1","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":"< 68.8.0esr-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 68.8.0esr-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":"< 1:68.8.0-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1:68.8.0-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"chromium-browser","name":"chromium-browser","label":"chromium-browser","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/chromium-browser","purlType":"deb","versions":[{"text":"< 81.0.4044.138-0ubuntu0.16.04.1","noFixRecorded":false,"fixedIn":null},{"text":"< 81.0.4044.138-0ubuntu0.18.04.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 81.0.4044.138-0ubuntu0.16.04.1 | < 81.0.4044.138-0ubuntu0.18.04.1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"firefox","name":"firefox","label":"firefox","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/firefox","purlType":"deb","versions":[{"text":"< 76.0+build2-0ubuntu0.16.04.1","noFixRecorded":false,"fixedIn":null},{"text":"< 76.0+build2-0ubuntu0.18.04.1","noFixRecorded":false,"fixedIn":null},{"text":"< 76.0+build2-0ubuntu0.20.04.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 76.0+build2-0ubuntu0.16.04.1 | < 76.0+build2-0ubuntu0.18.04.1 | < 76.0+build2-0ubuntu0.20.04.1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"mozjs38","name":"mozjs38","label":"mozjs38","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/mozjs38","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"mozjs52","name":"mozjs52","label":"mozjs52","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/mozjs52","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"mozjs68","name":"mozjs68","label":"mozjs68","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/mozjs68","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","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":"< 1:68.8.0+build2-0ubuntu0.16.04.2","noFixRecorded":false,"fixedIn":null},{"text":"< 1:68.8.0+build2-0ubuntu0.18.04.2","noFixRecorded":false,"fixedIn":null},{"text":"< 1:68.8.0+build2-0ubuntu0.20.04.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1:68.8.0+build2-0ubuntu0.16.04.2 | < 1:68.8.0+build2-0ubuntu0.18.04.2 | < 1:68.8.0+build2-0ubuntu0.20.04.2","eol":null,"hubHref":null},{"vendor":"debian","product":"debian_linux","name":"debian linux","label":"debian_linux","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"9.0","noFixRecorded":false,"fixedIn":null},{"text":"10.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"9.0 | 10.0","eol":{"isEol":true,"eolDate":"2022-07-01T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"9","label":"9 (Stretch)","eolFrom":"2022-07-01T00:00:00.000Z","isLts":false,"isMaintained":true,"latestVersion":"9.13"},"product":{"name":"debian","label":"Debian","category":"os"}},"hubHref":"/vendor/debian/debian_linux"},{"vendor":"mozilla","product":"firefox","name":"Firefox","label":"firefox","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ unspecified, < 76","noFixRecorded":false,"fixedIn":null},{"text":"< 76.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ unspecified, < 76 | < 76.0","eol":{"isEol":null,"eolDate":null,"matchMethod":"cpe","cycle":null,"product":{"name":"firefox","label":"Firefox","category":"app"}},"hubHref":"/vendor/mozilla/firefox"},{"vendor":"mozilla","product":"firefox_esr","name":"firefox esr","label":"firefox_esr","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ unspecified, < 68.8","noFixRecorded":false,"fixedIn":null},{"text":"< 68.8.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ unspecified, < 68.8 | < 68.8.0","eol":null,"hubHref":"/vendor/mozilla/firefox_esr"},{"vendor":"mozilla","product":"thunderbird","name":"Thunderbird","label":"thunderbird","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ unspecified, < 68.8.0","noFixRecorded":false,"fixedIn":null},{"text":"< 68.8.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ unspecified, < 68.8.0 | < 68.8.0","eol":null,"hubHref":"/vendor/mozilla/thunderbird"},{"vendor":"opensuse","product":"leap","name":"leap","label":"leap","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"15.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"15.2","eol":{"isEol":true,"eolDate":"2022-01-04T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"15.2","label":"Leap 15.2","eolFrom":"2022-01-04T00:00:00.000Z","isLts":false,"isMaintained":false,"latestVersion":null},"product":{"name":"opensuse","label":"openSUSE","category":"os"}},"hubHref":"/vendor/opensuse/leap"}],"affectedCount":15,"eol":{"hasEol":true,"count":3},"references":[{"url":"https://www.mozilla.org/security/advisories/mfsa2020-18/","label":"www.mozilla.org/security/advisories/mfsa2020-18/","hostname":"www.mozilla.org","tags":["X Refsource MISC","Vendor Advisory"]},{"url":"https://www.mozilla.org/security/advisories/mfsa2020-16/","label":"www.mozilla.org/security/advisories/mfsa2020-16/","hostname":"www.mozilla.org","tags":["X Refsource MISC","Vendor Advisory"]},{"url":"https://www.mozilla.org/security/advisories/mfsa2020-17/","label":"www.mozilla.org/security/advisories/mfsa2020-17/","hostname":"www.mozilla.org","tags":["X Refsource MISC","Vendor Advisory"]},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1632241","label":"bugzilla.mozilla.org/show_bug.cgi?id=1632241","hostname":"bugzilla.mozilla.org","tags":["X Refsource MISC","Permissions Required"]},{"url":"https://usn.ubuntu.com/4373-1/","label":"usn.ubuntu.com/4373-1/","hostname":"usn.ubuntu.com","tags":["Vendor Advisory","X Refsource UBUNTU","Third Party Advisory"]},{"url":"https://security.gentoo.org/glsa/202005-03","label":"security.gentoo.org/glsa/202005-03","hostname":"security.gentoo.org","tags":["X Refsource MISC","Patch","Third Party Advisory"]},{"url":"https://security.gentoo.org/glsa/202005-04","label":"security.gentoo.org/glsa/202005-04","hostname":"security.gentoo.org","tags":["X Refsource MISC","Third Party Advisory"]},{"url":"https://www.debian.org/security/2020/dsa-4714","label":"www.debian.org/security/2020/dsa-4714","hostname":"www.debian.org","tags":["Vendor Advisory","X Refsource DEBIAN","Third Party Advisory"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00000.html","label":"lists.opensuse.org/opensuse-security-announce/2020-07/msg00000.html","hostname":"lists.opensuse.org","tags":["Vendor Advisory","X Refsource SUSE","Mailing List","Third Party Advisory"]},{"url":"http://packetstormsecurity.com/files/158480/usrsctp-Stack-Buffer-Overflow.html","label":"packetstormsecurity.com/files/158480/usrsctp-Stack-Buffer-Overflow.html","hostname":"packetstormsecurity.com","tags":["X Refsource MISC","Third Party Advisory","VDB Entry"]},{"url":"https://ubuntu.com/security/CVE-2020-6831","label":"ubuntu.com/security/CVE-2020-6831","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.mozilla.org/en-US/security/advisories/mfsa2020-16/#CVE-2020-6831","label":"www.mozilla.org/en-US/security/advisories/mfsa2020-16/","hostname":"www.mozilla.org","tags":["REPORT"]},{"url":"https://www.mozilla.org/en-US/security/advisories/mfsa2020-17/#CVE-2020-6831","label":"www.mozilla.org/en-US/security/advisories/mfsa2020-17/","hostname":"www.mozilla.org","tags":["REPORT"]},{"url":"https://www.mozilla.org/en-US/security/advisories/mfsa2020-18/#CVE-2020-6831","label":"www.mozilla.org/en-US/security/advisories/mfsa2020-18/","hostname":"www.mozilla.org","tags":["REPORT"]},{"url":"https://ubuntu.com/security/notices/USN-4353-1","label":"ubuntu.com/security/notices/USN-4353-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/notices/USN-4373-1","label":"ubuntu.com/security/notices/USN-4373-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-6831","label":"www.cve.org/CVERecord?id=CVE-2020-6831","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2020-6831","label":"security-tracker.debian.org/tracker/CVE-2020-6831","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["DLA-2205-1","DLA-2206-1","DSA-4678-1","DSA-4683-1","DSA-4714-1","MGASA-2020-0208","MGASA-2020-0209","MGASA-2020-0210","OPENSUSE-SU-2020:0620-1","OPENSUSE-SU-2020:0621-1","OPENSUSE-SU-2020:0643-1","OPENSUSE-SU-2020:0648-1","OPENSUSE-SU-2020:0709-1","OPENSUSE-SU-2020:0917-1","OPENSUSE-SU-2024:10600-1","OPENSUSE-SU-2024:10601-1","OPENSUSE-SU-2024:10681-1","OPENSUSE-SU-2024:12948-1","OPENSUSE-SU-2024:14572-1","RHSA-2020:2031","RHSA-2020:2032","RHSA-2020:2033","RHSA-2020:2036","RHSA-2020:2037","RHSA-2020:2046","RHSA-2020:2047","RHSA-2020:2048","RHSA-2020:2049","RHSA-2020:2050","RHSA-2020:2064","SUSE-SU-2020:1209-1","SUSE-SU-2020:1218-1","SUSE-SU-2020:1225-1","SUSE-SU-2020:14359-1","USN-4353-1","USN-4373-1"],"duplicates":[],"related":["OPENSUSE-SU-2020:0620-1","OPENSUSE-SU-2020:0621-1","OPENSUSE-SU-2020:0643-1","OPENSUSE-SU-2020:0648-1","OPENSUSE-SU-2020:0709-1","OPENSUSE-SU-2020:0917-1","OPENSUSE-SU-2024:10600-1","OPENSUSE-SU-2024:10601-1","OPENSUSE-SU-2024:10681-1","OPENSUSE-SU-2024:12948-1","OPENSUSE-SU-2024:14572-1","SUSE-SU-2020:1209-1","SUSE-SU-2020:1218-1","SUSE-SU-2020:1225-1","SUSE-SU-2020:14359-1","USN-4353-1","USN-4373-1"]},"timeline":[{"kind":"published","date":"2020-05-26T17:05:57.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-04T09:11:05.112Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":70,"level":"high","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T10:31:27.127Z","stale":false,"partial":false}}