How severe is CVE-2019-25371?

CVE-2019-25371 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2019-25371 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-25371?

CVE-2019-25371 affects Opnsense. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-25371?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2019-25371 have an EU (EUVD) identifier?

Yes. CVE-2019-25371 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2019-19424.

When was CVE-2019-25371 published?

CVE-2019-25371 was published on 2026-02-15 and last updated on 2026-06-17.

CVE-2019-25371

CVE-2019-25371 is a medium-severity vulnerability in Opnsense with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v4: 5.1
EPSS exploit prediction: 0% (15th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2019-19424
Weakness: CWE-79
Affected product: Opnsense
Published: 2026-02-15
Last modified: 2026-06-17

Description

OPNsense 19.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts by exploiting insufficient input validation in the host parameter. Attackers can submit crafted POST requests to the diag_ping.php endpoint with script payloads in the host parameter to execute arbitrary JavaScript in users' browsers.

Frequently asked questions

What is CVE-2019-25371?: OPNsense 19.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts by exploiting insufficient input validation in the host parameter. Attackers can submit crafted POST requests to the diag_ping.php endpoint with script payloads in the host parameter to execute arbitrary JavaScript in users' browsers.
How severe is CVE-2019-25371?: CVE-2019-25371 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2019-25371 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-25371?: CVE-2019-25371 affects Opnsense. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-25371?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2019-25371 have an EU (EUVD) identifier?: Yes. CVE-2019-25371 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2019-19424.
When was CVE-2019-25371 published?: CVE-2019-25371 was published on 2026-02-15 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:opnsense:opnsense:19.1:*:*:*:*:*:*:*

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