CVE-2019-25375

Name: CVE-2019-25375
Creator: NVD / NIST
Published: 2026-02-15T14:16:07.417+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.1/10EPSS 0.36%

Last modified Jun 17, 2026

CVE-2019-25375 is a medium-severity vulnerability rated 5.1/10 on the CVSS scale. OPNsense 19.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts by submitting crafted input to the mailserver parameter. Attackers can send POST requests to the monit interface with JavaScript payloads in the mailserver parameter to execute arbitrary code in users' browsers.. EPSS estimates a 0.36% chance of exploitation in the next 30 days.

Description

OPNsense 19.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts by submitting crafted input to the mailserver parameter. Attackers can send POST requests to the monit interface with JavaScript payloads in the mailserver parameter to execute arbitrary code in users' browsers.

Metrics

CVSS 3.1

6.1/10

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

CVSS 4.0

5.1/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.36%

27.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Opnsense	Opnsense	19.1

References

https://forum.opnsense.org/index.php?topic=11469.0Release Notes
https://opnsense.orgProduct
https://www.exploit-db.com/exploits/46351Exploit, Third Party Advisory, VDB Entry
https://www.vulncheck.com/advisories/opnsense-reflected-xss-via-monit-interfaceThird Party Advisory

Timeline

Published: Feb 15, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2019-25375?

How severe is CVE-2019-25375?

CVE-2019-25375 has a CVSS score of 5.1/10 (MEDIUM severity). The EPSS model estimates a 0.36% probability of exploitation in the next 30 days.

How do I fix CVE-2019-25375?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-25375?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST