What is CVE-2019-25374?

CVE-2019-25374 is a medium-severity vulnerability in Opnsense, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-02-15.

How severe is CVE-2019-25374?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Opnsense

CVE-2019-25374

OPNsense 19.1 contains a reflected cross-site scripting vulnerability that allows attackers to inject malicious scripts by exploiting the passthrough_networks parameter in vpn_ipsec_settings.php. Attackers can craft POST requests with JavaScript payloads in the passthrough_networks parameter to execute arbitrary code in users' browsers.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.003 (24.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Opnsense — versions 19.1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

disclosure@vulncheck.com (Exploit, VDB Entry, Third Party Advisory, exploit)
disclosure@vulncheck.com (Product, product)
disclosure@vulncheck.com (Release Notes, patch)
disclosure@vulncheck.com (Broken Link, third-party-advisory)

Frequently asked questions

What is CVE-2019-25374?: CVE-2019-25374 is a medium-severity vulnerability in Opnsense, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-02-15.
How severe is CVE-2019-25374?: Medium severity. CVSS v3 base score is 6.1 out of 10.