CVE-2020-25205: Mimosa b5 Firmware

Medium severity, CVSS 6.1. EPSS: 0.9% chance of exploitation in the next 30 days.

The web console for Mimosa B5, B5c, and C5x firmware through 2.8.0.2 is vulnerable to stored XSS in the set_banner() function of /var/www/core/controller/index.php. An unauthenticated attacker may set the contents of the /mnt/jffs2/banner.txt file, stored on the device's filesystem, to contain arbitrary JavaScript. The file contents are then used as part of a welcome/banner message presented to unauthenticated users who visit the login page for the web console. This vulnerability does not occur in the older 1.5.x firmware versions.

Affected products

• Mimosa b5 Firmware: up to and including 2.8.0.3
• Mimosa b5c Firmware: up to and including 2.8.0.3
• Mimosa c5c Firmware: up to and including 2.8.0.3

Published 2021-07-20. Last modified 2026-06-17.