The vulnerability of the Thunderbird email client, as well as the Firefox and Firefox ESR browsers, allows a hacker to trigger a service failure or execute arbitrary code.

The vulnerability of the nsScannerString::AppendUnicodeTo function in Thunderbird email clients, as well as in Firefox and Firefox ESR browsers, arises due to buffer overflows. Exploiting this vulnerability allows an attacker to execute arbitrary code or cause a service failure memory exhaustion ...