CVE-2019-25388Public exploitNetwork attack vector

Browser script execution via unescaped ipblock parameters

Published Feb 16, 2026 · Updated Feb 16, 2026

Reflected XSS in Smoothwall Express 3.1-SP4-polar-x86_64-update9 allows remote attackers to execute JavaScript in users' browsers. The ipblock.cgi handler places untrusted SRC_IP and COMMENT values from POST requests into its HTML response without neutralizing script markup. No authentication is required to submit the request, but execution requires a user to render the crafted response; the published impact is browser-context data access or modification, not service interruption.

CVSS severity5.1
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Smoothwall Express 3.1-SP4-polar-x86_64-update9 allows remote attackers to execute JavaScript in users' browsers. The ipblock.cgi handler places untrusted SRC_IP and COMMENT values from POST requests into its HTML response without neutralizing script markup. No authentication is required to submit the request, but execution requires a user to render the crafted response; the published impact is browser-context data access or modification, not service interruption.

The record

CVE
CVE-2019-25388
Published
Feb 16, 2026
Updated
Feb 16, 2026
Vendor
Smoothwall
Product
Smoothwall Express
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Smoothwall · Smoothwall Expressversion=3.1

Published CVSS scores

6.1VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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