CVE-2019-18648: When logged in as an admin user, the Untangle NG firewall 14.2.0 is vulnerable to reflected XSS at multiple pl

Routine

MEDIUM 4.8DOWNGRADE

CVE-2019-18648 is a medium-severity flaw (CVSS 4.8) affecting ng firewall. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

When logged in as an admin user, the Untangle NG firewall 14.2.0 is vulnerable to reflected XSS at multiple places and specific user input fields.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-79
Published	2019-11-14
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: untangle

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

Am I affected?

Timeline

2019-11-14 15:15 UTCPublished CVE record published
2026-06-17 02:25 UTCUpdated Record last modified

untangle ng firewall DOWNGRADE

Affected: 14.2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 14.2.0

1. Check installed version

apt-cache policy ng-firewall || rpm -q ng-firewall || ng-firewall --version

2. No fixed release: DOWNGRADE to a release before 14.2.0 (Debian / Ubuntu)

apt-cache madison ng-firewall sudo apt install ng-firewall=<VERSION_BEFORE_14.2.0> sudo apt-mark hold ng-firewall

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list ng-firewall sudo dnf downgrade ng-firewall-<VERSION_BEFORE_14.2.0> sudo dnf versionlock add ng-firewall

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2019-18648?

ng firewall: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-18648 being exploited?

CVE-2019-18648 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-2019-18648 affect?

CVE-2019-18648 affects ng firewall. Severity is medium (CVSS 4.8). When logged in as an admin user, the Untangle NG firewall 14.2.0 is vulnerable to reflected XSS at multiple places and specific user input fields.

How urgent is CVE-2019-18648?

Priority 28/100. No elevated risk signals yet.

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References

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