{"schemaVersion":3,"id":"MGASA-2021-0198","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"Updated thunderbird packages fix security vulnerabilities\n\nMore internal network hosts could have been probed by a malicious webpage:\nFurther techniques that built on the slipstream research combined with a\nmalicious webpage could have exposed both an internal network's hosts as well\nas services running on the user's local machine (CVE-2021-23961).\n\nOut of bound write due to lazy initialization:\nA WebGL framebuffer was not initialized early enough, resulting in memory\ncorruption and an out of bound write (CVE-2021-23994).\n\nUse-after-free in Responsive Design Mode:\nWhen Responsive Design Mode was enabled, it used references to objects that\nwere previously freed. We presume that with enough effort this could have been\nexploited to run arbitrary code (CVE-2021-23995).\n\nSecure Lock icon could have been spoofed:\nThrough complicated navigations with new windows, an HTTP page could have\ninherited a secure lock icon from an HTTPS page (CVE-2021-23998).\n\nBlob URLs may have been granted additional privileges:\nIf a Blob URL was loaded through some unusual user interaction, it could have\nbeen loaded by the System Principal and granted additional privileges that\nshould not be granted to web content (CVE-2021-23999).\n\nArbitrary FTP command execution on FTP servers using an encoded URL:\nWhen a user clicked on an FTP URL containing encoded newline characters\n(%0A and %0D), the newlines would have been interpreted as such and allowed\narbitrary commands to be sent to the FTP server (CVE-2021-24002).\n\nIncorrect size computation in WebAssembly JIT could lead to null-reads:\nThe WebAssembly JIT could miscalculate the size of a return type, which could\nlead to a null read and result in a crash.\nNote: This issue only affected x86-32 platforms. Other platforms are unaffected.\n(CVE-2021-29945).\n\nPort blocking could be bypassed:\nPorts that were written as an integer overflow above the bounds of a 16-bit\ninteger could have bypassed port blocking restrictions when used in the\nAlt-Svc header (CVE-2021-29946).\n\nRace condition when reading from disk while verifying signatures:\nSignatures are written to disk before and read during verification, which might\nbe subject to a race condition when a malicious local process or user is replacing\nthe file (CVE-2021-29948).","dates":{"published":"2021-04-29T09:41:35.000Z","modified":"2026-04-16T04:41:07.439Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":null,"severity":"unknown","version":null,"versionLabel":null,"source":null,"vector":null,"computed":false,"selection":"none"},"metrics":[]},"epss":{"probability":null,"percentile":null,"severity":"unknown","asOf":null,"change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[],"last30":[]},"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":[],"affected":[{"vendor":"mageia","product":"thunderbird","name":"thunderbird","label":"thunderbird","ecosystem":"Mageia","cpePart":null,"purl":"pkg:rpm/mageia/thunderbird","purlType":"rpm","versions":[{"text":"< 78.10.0-1.mga7","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 78.10.0-1.mga7","eol":null,"hubHref":null},{"vendor":"mageia","product":"thunderbird-l10n","name":"thunderbird-l10n","label":"thunderbird-l10n","ecosystem":"Mageia","cpePart":null,"purl":"pkg:rpm/mageia/thunderbird-l10n","purlType":"rpm","versions":[{"text":"< 78.10.0-1.mga7","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 78.10.0-1.mga7","eol":null,"hubHref":null},{"vendor":"mageia","product":"thunderbird","name":"thunderbird","label":"thunderbird","ecosystem":"Mageia","cpePart":null,"purl":"pkg:rpm/mageia/thunderbird","purlType":"rpm","versions":[{"text":"< 78.10.0-1.mga8","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 78.10.0-1.mga8","eol":null,"hubHref":null},{"vendor":"mageia","product":"thunderbird-l10n","name":"thunderbird-l10n","label":"thunderbird-l10n","ecosystem":"Mageia","cpePart":null,"purl":"pkg:rpm/mageia/thunderbird-l10n","purlType":"rpm","versions":[{"text":"< 78.10.0-1.mga8","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 78.10.0-1.mga8","eol":null,"hubHref":null}],"affectedCount":4,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://advisories.mageia.org/MGASA-2021-0198.html","label":"advisories.mageia.org/MGASA-2021-0198.html","hostname":"advisories.mageia.org","tags":["Advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=28829","label":"bugs.mageia.org/show_bug.cgi?id=28829","hostname":"bugs.mageia.org","tags":["REPORT"]},{"url":"https://www.mozilla.org/en-US/security/advisories/mfsa2021-14/","label":"www.mozilla.org/en-US/security/advisories/mfsa2021-14/","hostname":"www.mozilla.org","tags":["Advisory"]},{"url":"https://www.thunderbird.net/en-US/thunderbird/78.10.0/releasenotes/","label":"www.thunderbird.net/en-US/thunderbird/78.10.0/releasenotes/","hostname":"www.thunderbird.net","tags":["WEB"]},{"url":"https://access.redhat.com/errata/RHSA-2021:1353","label":"access.redhat.com/errata/RHSA-2021:1353","hostname":"access.redhat.com","tags":["WEB"]}],"lineage":{"upstream":["CVE-2021-23961","CVE-2021-23994","CVE-2021-23995","CVE-2021-23998","CVE-2021-23999","CVE-2021-24002","CVE-2021-29945","CVE-2021-29946","CVE-2021-29948"],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2021-04-29T09:41:35.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-04-16T04:41:07.439Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":0,"level":"minimal","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T13:45:28.906Z","stale":false,"partial":false}}