CVE-2019-25377 - CVE House
Back to Database
Status published Medium CVE-2019-25377

OPNsense 19.1 Reflected XSS via system_advanced_sysctl.php

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2019-25377

Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Ozer Goker

References

More from Opnsense

View All →
CVE-2019-25376
OPNsense 19.1 Reflected XSS via proxy endpoint
Medium 5.1
CVE-2019-25375
OPNsense 19.1 Reflected XSS via monit interface
Medium 5.1
CVE-2019-25374
OPNsense 19.1 Reflected XSS via vpn_ipsec_settings.php
Medium 5.1
CVE-2019-25373
OPNsense 19.1 Stored XSS via firewall_rules_edit.php
Medium 5.1
CVE-2019-25372
OPNsense 19.1 Reflected XSS via diag_traceroute.php
Medium 5.1

Affected Vendor

Affected Software

OPNsense
Vulnerable Versions:
19.1

Timeline

Official Publish: February 15th, 2026
Last Modified: May 24th, 2026
Added to House: July 20th, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Weaknesses (CWE)

CWE-79

MITRE ATT&CK TTPs

T1189 Drive-by Compromise
Initial Access
T1059.007 JavaScript
Execution
T1539 Steal Web Session Cookie
Collection
T1213 Data from Information Repositories
Collection
T1567 Exfiltration Over Web Service
Exfiltration
T1491.001 Defacement
Impact