CVE-2019-25394: Smoothwall Express 3.1-SP4-polar-x86_64-update9 contains multiple stored cross-site scripting vulnerabilities

This week

HIGH 7.2REMOTEMITIGATE

CVE-2019-25394 is a high-severity flaw (CVSS 7.2) affecting smoothwall express. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Smoothwall Express 3.1-SP4-polar-x86_64-update9 contains multiple stored cross-site scripting vulnerabilities in the modem.cgi script that allow attackers to inject malicious scripts through POST parameters. Attackers can submit crafted payloads in parameters like INIT, HANGUP, SPEAKER_ON, SPEAKER_OFF, TONE_DIAL, and PULSE_DIAL to execute arbitrary JavaScript in users' browsers when the stored data is retrieved.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 82%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-02-16
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: smoothwall

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-16 18:19 UTCPublished CVE record published
2026-06-17 02:32 UTCUpdated Record last modified

smoothwall smoothwall express MITIGATE

Affected: 3.1 sp4

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.1

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-25394?

smoothwall express: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-25394 being exploited?

CVE-2019-25394 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-25394 affect?

CVE-2019-25394 affects smoothwall express. Severity is high (CVSS 7.2). Smoothwall Express 3.1-SP4-polar-x86_64-update9 contains multiple stored cross-site scripting vulnerabilities in the modem.cgi script that allow attackers to inject malicious scripts through POST parameters. Attackers can submit crafted pay

How urgent is CVE-2019-25394?

Priority 40/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-27508 MEDIUM 5.4 UPGRADE Smoothwall Express versions prior to 3.1 Update 13 contain a reflected cross-site scripting vulnerability in t
CVE-2026-26352 MEDIUM 5.4 UPGRADE Smoothwall Express versions prior to 3.1 Update 13 contain a stored cross-site scripting vulnerability in the
CVE-2019-25395 HIGH 7.2 MITIGATE Smoothwall Express 3.1-SP4-polar-x86_64-update9 contains multiple stored cross-site scripting vulnerabilities
CVE-2019-25393 MEDIUM 6.1 MITIGATE Smoothwall Express 3.1-SP4-polar-x86_64-update9 contains a reflected cross-site scripting vulnerability that a
CVE-2019-25392 MEDIUM 6.1 MITIGATE Smoothwall Express 3.1-SP4-polar-x86_64-update9 contains a reflected cross-site scripting vulnerability that a

References

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