CVE-2020-26970

—

CVSS 3.1

8.8 high

EPSS

1%p68

Published

Dec 9, 2020 (Dec 9, 2020)

Modified

Jun 17, 2026

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.

Vendors: mozilla
Products: thunderbird
Weakness: CWE-787
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (1.2%)

In the news0 stories

No ingested article mentions this CVE yet.