CVE-2020-26970 Information

Description

When reading SMTP server status codes Thunderbird writes an integer value to a position on the stack that is intended to contain just one byte. Depending on processor architecture and stack layout this leads to stack corruption that may be exploitable. This vulnerability affects Thunderbird < 78.5.1.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Reference

https://bugzilla.mozilla.org/show_bug.cgi?id=1677338 https://www.mozilla.org/security/advisories/mfsa2020-53/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.8