PatchTheCVECVE-2020-25205: The web console for Mimosa B5, B5c, and C5x firmware through 2.8.0.2 is vulnerable to stored XSS in the set_ba
CVE-2020-25205 is a medium-severity flaw (CVSS 6.1) affecting b5 firmware, b5c firmware, c5c firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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 t
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.1 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.9% (top 40%) |
| CISA exploited list | No |
| Weakness | CWE-79 |
| Published | 2021-07-20 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2020-25205?
b5 firmware: upgrade to newer than 2.8.0.3; b5c firmware: upgrade to newer than 2.8.0.3; c5c firmware: upgrade to newer than 2.8.0.3. Exact commands for each OS are on this page.
Is CVE-2020-25205 being exploited?
CVE-2020-25205 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2020-25205 affect?
CVE-2020-25205 affects b5 firmware, b5c firmware, c5c firmware. Severity is medium (CVSS 6.1). 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.t
How urgent is CVE-2020-25205?
Priority 41/100. Public exploit reference
Software pages
Related CVEs
- CVE-2020-25206 HIGH 7.2 UPGRADE UPGRADE The web console for Mimosa B5, B5c, and C5x firmware through 2.8.0.2 allows authenticated command injection in