What is the CVSS score of CVE-2019-25378?

CVE-2019-25378 has a CVSS 3.1 base score of 6.1 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of Smoothwall Express are affected by CVE-2019-25378?

Organizations using the proxy.cgi endpoint that allow attackers to inject malicious scripts should be aware of moderate risk from CVE-2019-25378, a cross-site scripting vulnerability rated CVSS 6.1.

Is there a public PoC exploit available for CVE-2019-25378?

Yes, a public proof-of-concept exploit is available for CVE-2019-25378. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2019-25378?

Within 30 days: Identify affected systems running the proxy.cgi endpoint that allow attackers to inject malici and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Smoothwall Express CVE-2019-25378

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-02-16 disclosure@vulncheck.com

XSS Smoothwall Express

6.1

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

6.1 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Feb 20, 2026 - 21:23 vuln.today

Public exploit code

CVE Published

Feb 16, 2026 - 18:19 nvd

MEDIUM 6.1

DescriptionCVE.org

Smoothwall Express 3.1-SP4-polar-x86_64-update9 contains multiple cross-site scripting vulnerabilities in the proxy.cgi endpoint that allow attackers to inject malicious scripts through parameters including CACHE_SIZE, MAX_SIZE, MIN_SIZE, MAX_OUTGOING_SIZE, and MAX_INCOMING_SIZE. Attackers can submit POST requests with script payloads to store or reflect arbitrary JavaScript code that executes in users' browsers when the proxy configuration page is accessed.

AnalysisAI

Technical ContextAI

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects the proxy.cgi component of Smoothwall Express. Smoothwall Express 3.1-SP4-polar-x86_64-update9 contains multiple cross-site scripting vulnerabilities in the proxy.cgi endpoint that allow attackers to inject malicious scripts through parameters including CACHE_SIZE, MAX_SIZE, MIN_SIZE, MAX_OUTGOING_SIZE, and MAX_INCOMING_SIZE. Attackers can submit POST requests with script payloads to store or reflect arbitrary JavaScript code that executes in users' browsers when the proxy configuration page is accessed.

RemediationAI

Monitor vendor advisories for a patch. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.

CVE-2019-25378 vulnerability details – vuln.today

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