CVE-2025-21603 Cross-site scripting in MZK-DP300N
An authenticated attacker can execute arbitrary scripts in a victim's browser via crafted URLs in the MZK-DP300N firmware.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-21603?
CVE-2025-21603 is a medium-severity cross-site scripting vulnerability in PLANEX COMMUNICATIONS INC. MZK-DP300N, published on 8 Jan 2025. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
Cross-site scripting vulnerability exists in MZK-DP300N firmware versions 1.05 and earlier. If an attacker logs in to the affected product and manipulates the device settings, an arbitrary script may be executed on the logged-in user's web browser when accessing a crafted URL.
Weakness: CWE-79
Which versions are affected by CVE-2025-21603?
How do I fix CVE-2025-21603?
No fix has been published for CVE-2025-21603 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2025-21603 being exploited?
There is no known exploitation of CVE-2025-21603 in the wild and no public exploit code.
Sources
Also known as GHSA-34w5-cvqh-fxgw.