Is CVE-2019-25372 actively exploited?

A weaponized exploit exists for CVE-2019-25372, making exploitation likely. It is not yet confirmed in the CISA KEV catalog.

Can CVE-2019-25372 be exploited remotely?

Yes. CVE-2019-25372 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2019-25372?

CVE-2019-25372 has a CVSS score of 6.1 (MEDIUM) and an EPSS exploitation probability of 0.03%.

HOME VULNERABILITIESCVE-2019-25372

MEDIUMWEAPONIZED

CVE-2019-25372

CWE-79Published: February 15, 2026· Updated: Feb 18, 2026

6.1

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:8.6th

Official Description

OPNsense 19.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts by exploiting insufficient input validation in the host parameter. Attackers can submit crafted payloads through POST requests to diag_traceroute.php to execute arbitrary JavaScript in the context of a user's browser session.

NVD Source

Risk Analysis

This CVE describes a reflected cross-site scripting vulnerability in OPNsense 19.1. An unauthenticated attacker can inject malicious scripts by exploiting insufficient input validation in the host parameter of diag_traceroute.php. This can lead to arbitrary JavaScript execution in a victim's browser. The CVSS score of 6.1 (MEDIUM) indicates a moderate severity, and the very low EPSS score of 0.00033 suggests a low likelihood of widespread exploitation.

A weaponized exploit for this vulnerability is known to be circulating. The vulnerability is remotely exploitable as it does not require authentication and has low attack complexity.

Recommended Action

Administrators should update OPNsense to a patched version to address the input validation flaw. Implementing robust input sanitization on web applications can help prevent similar XSS vulnerabilities.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2019-25372 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

A weaponized exploit for CVE-2019-25372 is publicly known. This significantly lowers the barrier for threat actors and increases the urgency for remediation.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.