CVE-2018-20218: An issue was discovered on Teracue ENC-400 devices with firmware 2.56 and below

Q: How do I fix CVE-2018-20218?

enc-400 hdmi firmware: upgrade to newer than 2.56; enc-400 hdmi2 firmware: upgrade to newer than 2.56; enc-400 hdsdi firmware: upgrade to newer than 2.56. Exact commands for each OS are on this page.

Q: Is CVE-2018-20218 being exploited?

CVE-2018-20218 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2018-20218 affect?

CVE-2018-20218 affects enc-400 hdmi firmware, enc-400 hdmi2 firmware, enc-400 hdsdi firmware. Severity is critical (CVSS 9.8). An issue was discovered on Teracue ENC-400 devices with firmware 2.56 and below. The login form passes user input directly to a shell command without any kind of escaping or validation in /usr/share/www/check.lp file. An attacker is able to

Q: How urgent is CVE-2018-20218?

Priority 68/100. Critical severity; EPSS top 4%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADEUPGRADEUPGRADE

CVE-2018-20218 is a critical-severity flaw (CVSS 9.8) affecting enc-400 hdmi firmware, enc-400 hdmi2 firmware, enc-400 hdsdi firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered on Teracue ENC-400 devices with firmware 2.56 and below. The login form passes user input directly to a shell command without any kind of escaping or validation in /usr/share/www/check.lp file. An attacker is able to perform command injection using the "password" parameter in the login form.

Why this priority

Critical severity
EPSS top 4%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	10.7% (top 4%)
CISA exploited list	No
Weakness	CWE-78
Published	2019-03-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: teracue

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

Am I affected?

Timeline

2019-03-21 16:00 UTCPublished CVE record published
2026-06-17 01:52 UTCUpdated Record last modified

teracue enc-400 hdmi firmware UPGRADE

Affected: <= 2.56

Fixed in: newer than 2.56

Safe to downgrade to: no unaffected older release

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.

teracue enc-400 hdmi2 firmware UPGRADE

Affected: <= 2.56

Fixed in: newer than 2.56

Safe to downgrade to: no unaffected older release

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.

teracue enc-400 hdsdi firmware UPGRADE

Affected: <= 2.56

Fixed in: newer than 2.56

Safe to downgrade to: no unaffected older release

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Teracue ENC-400 - Command Injection / Missing Authentication

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-2018-20218?

enc-400 hdmi firmware: upgrade to newer than 2.56; enc-400 hdmi2 firmware: upgrade to newer than 2.56; enc-400 hdsdi firmware: upgrade to newer than 2.56. Exact commands for each OS are on this page.

Is CVE-2018-20218 being exploited?

CVE-2018-20218 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-2018-20218 affect?

CVE-2018-20218 affects enc-400 hdmi firmware, enc-400 hdmi2 firmware, enc-400 hdsdi firmware. Severity is critical (CVSS 9.8). An issue was discovered on Teracue ENC-400 devices with firmware 2.56 and below. The login form passes user input directly to a shell command without any kind of escaping or validation in /usr/share/www/check.lp file. An attacker is able to

How urgent is CVE-2018-20218?

Priority 68/100. Critical severity; EPSS top 4%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2018-20220 HIGH 7.5 UPGRADE UPGRADE An issue was discovered on Teracue ENC-400 devices with firmware 2.56 and below
CVE-2018-20219 HIGH 8.1 UPGRADE UPGRADE An issue was discovered on Teracue ENC-400 devices with firmware 2.56 and below

References

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