CVE-2020-15677: Debian Linux

Medium severity, CVSS 6.1. EPSS: 1.7% chance of exploitation in the next 30 days.

By exploiting an Open Redirect vulnerability on a website, an attacker could have spoofed the site displayed in the download file dialog to show the original site (the one suffering from the open redirect) rather than the site the file was actually downloaded from. This vulnerability affects Firefox < 81, Thunderbird < 78.3, and Firefox ESR < 78.3.

Affected products

• Debian Debian Linux: version 9.0 only; version 10.0 only
• Mozilla Firefox: before 81.0 (fixed in 81.0)
• Mozilla Firefox ESR: before 78.3 (fixed in 78.3)
• Mozilla Thunderbird: before 78.3 (fixed in 78.3)
• Opensuse Leap: version 15.1 only; version 15.2 only

Published 2020-10-01. Last modified 2026-06-17.