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Vulnerability record · CVE-2020-25205 · published 20 July 2021

CVE-2020-25205: Mimosa b5 firmware cross-site scripting vulnerability

Mimosa · B5 Firmware

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.

6.1 CVSS 3.1 Medium EPSS 0.91% · top 41.8% CWE-79 · Cross-site scripting
6.1CVSS 3.1 base score, v2 4.3
0.91%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

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

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://labs.f-secure.com/advisories/ Third Party Advisory
https://labs.f-secure.com/advisories/mimosa-ptp-devices-multiple-vulnerabilities/ ExploitThird Party Advisory
https://labs.f-secure.com/advisories/ Third Party Advisory
https://labs.f-secure.com/advisories/mimosa-ptp-devices-multiple-vulnerabilities/ ExploitThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-25205), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.