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Vulnerabilities

Vulnerability · CVE-2019-25377

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 par

Published Feb 15, 2026 · catalog updated Jun 17, 2026 · OPNsense 19.1 contains a

Last checked Nov 6, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2019-25377. EPSS is 0.28%. Act only if a listed version of OPNsense 19.1 contains a is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (OPNsense 19.1 contains a).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium4.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.28%
Remediation
Vendor / distro source
Affected products
cpe opnsense/opnsense · vendor OPNsense OPNsense 19.1

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe opnsense/opnsense19.1
  • vendor OPNsense OPNsense 19.119.1

How to fix CVE-2019-25377

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2019-25377. EPSS is 0.28%. Act only if a listed version of OPNsense 19.1 contains a is installed.

Which versions are affected?

Compare what you have installed with OPNsense OPNsense 19.1 19.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-79: Cross-site Scripting (XSS). EPSS 0.28%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

OPNsense security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 15, 2026 · EUVD

    Detected

    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.

  2. May 24, 2026 · EUVD

    Updated

    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.

  3. Jun 17, 2026 · Monitored products — high

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2019-25377

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2019-25377

    30-day exploitation probability 0.28%

    first.org
  • EUVDVulnerability recordEUVD-2019-19419

    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 Jav

    euvd.enisa.europa.eu
  • Monitored products — highVendor advisoryCVE-2019-25377

    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.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Monitored products — highNov 6, 2026
  • EUVDNov 5, 2026
  • FIRST EPSSNov 5, 2026
  • CVE.orgNov 4, 2026