XSS in Opnsense
CVE-2019-25369
OPNsense 19.1 contains a stored cross-site scripting vulnerability in the system_advanced_sysctl.php endpoint that allows attackers to inject persistent malicious scripts via the tunable parameter. Attackers can submit POST requests with script payloads that are stored and executed in the context of authenticated user sessions when the page is viewed.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (9.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 9.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Opnsense — versions 19.1
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/46351 (Exploit, VDB Entry, Third Party Advisory, exploit)
- opnsense.org (Product, product)
- forum.opnsense.org/index.php (Release Notes, patch)
- www.vulncheck.com/advisories/opnsense-stored-xss-via-systemadvancedsysctlphp (Broken Link, third-party-advisory)
Frequently asked questions
- What is CVE-2019-25369?
- CVE-2019-25369 is a medium-severity vulnerability in Opnsense, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-02-15.
- How severe is CVE-2019-25369?
- Medium severity. CVSS v3 base score is 6.4 out of 10.