CVE-2020-12406

Mozilla Developer Iain Ireland discovered a missing type check during unboxed objects removal, resulting in a crash. We presume that with enough effort that it could be exploited to run arbitrary code. This vulnerability affects Thunderbird < 68.9.0, Firefox < 77, and Firefox ESR < 68.9.

• CWE-345

• https://bugzilla.mozilla.org/show_bug.cgi?id=1639590Issue Tracking, Vendor Advisory
• https://usn.ubuntu.com/4421-1/Third Party Advisory
• https://www.mozilla.org/security/advisories/mfsa2020-20/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2020-21/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2020-22/Vendor Advisory
• https://bugzilla.mozilla.org/show_bug.cgi?id=1639590Issue Tracking, Vendor Advisory
• https://usn.ubuntu.com/4421-1/Third Party Advisory
• https://www.mozilla.org/security/advisories/mfsa2020-20/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2020-21/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2020-22/Vendor Advisory

Published

Jul 9, 2020

Last Modified

Jun 17, 2026

Status

Modified

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