CVE-2019-25421 Comodo Dome Firewall 2.7.0 Cross-Site Scripting via policyfw

Medium 5.1 Published 19 Feb 2026 Updated 24 May 2026

Attackers can inject malicious scripts via the policyfw endpoint to execute code in administrator browsers or store persistent payloads.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2019-25421?

CVE-2019-25421 is a medium-severity cross-site scripting vulnerability in Comodo Dome Firewall, published on 19 Feb 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Comodo Dome Firewall 2.7.0 contains multiple cross-site scripting vulnerabilities that allow attackers to inject malicious scripts through the policyfw endpoint. Attackers can submit POST requests with JavaScript payloads in the mac, target, and remark parameters to execute arbitrary code in administrator browsers or store persistent scripts in the application.

Weakness: CWE-79

Which versions are affected by CVE-2019-25421?

It affects 1 product.

Products include Comodo Dome Firewall.

How do I fix CVE-2019-25421?

No fix has been published for CVE-2019-25421 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-2019-25421 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-25421 exists.

Sources

Also known as GHSA-h82x-c7r5-xpqv.