CVE-2019-25377

Name: CVE-2019-25377
Creator: NVD / NIST
Published: 2026-02-15T14:16:07.763+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.8/10EPSS 0.24%

Last modified Jun 17, 2026

CVE-2019-25377 is a medium-severity vulnerability rated 4.8/10 on the CVSS scale. OPNsense 19.1 contains a reflected cross-site scripting vulnerability in the system_advanced_sysctl.php endpoint that allows attackers to inject malicious scripts via the value parameter. Attackers can craft POST requests with script payloads in the value parameter to execute JavaScript in the context of authenticated user sessions.. EPSS estimates a 0.24% chance of exploitation in the next 30 days.

Description

OPNsense 19.1 contains a reflected cross-site scripting vulnerability in the system_advanced_sysctl.php endpoint that allows attackers to inject malicious scripts via the value parameter. Attackers can craft POST requests with script payloads in the value parameter to execute JavaScript in the context of authenticated user sessions.

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

4.8/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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

0.24%

15.3th 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-systemadvancedsysctlphpBroken Link

Timeline

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

Frequently Asked Questions

What is CVE-2019-25377?

How severe is CVE-2019-25377?

CVE-2019-25377 has a CVSS score of 4.8/10 (MEDIUM severity). The EPSS model estimates a 0.24% probability of exploitation in the next 30 days.

How do I fix CVE-2019-25377?

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-2019-25377?

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

Scan your code now

Source: NVD / NIST