CVE-2018-20487: An issue was discovered in the firewall3 component in Inteno IOPSYS 1.0 through 3.16

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HIGH 8.8UPGRADE

CVE-2018-20487 is a high-severity flaw (CVSS 8.8) affecting iopsys. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in the firewall3 component in Inteno IOPSYS 1.0 through 3.16. The attacker must make a JSON-RPC method call to add a firewall rule as an "include" and point the "path" argument to a malicious script or binary. This gets executed as root when the firewall changes are committed.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.9% (top 21%)
CISA exploited list	No
Weakness	CWE-20
Published	2019-04-11
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: inteno

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

Am I affected?

Timeline

2019-04-11 21:29 UTCPublished CVE record published
2026-06-17 01:52 UTCUpdated Record last modified

inteno iopsys UPGRADE

Affected: >= 1.0 and <= 3.16

Fixed in: newer than 3.16

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy iopsys || rpm -q iopsys || iopsys --version

2. UPGRADE to newer than 3.16 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade iopsys

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade iopsys

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison iopsys sudo apt install iopsys=<VERSION_BEFORE_1.0> sudo apt-mark hold iopsys

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list iopsys sudo dnf downgrade iopsys-<VERSION_BEFORE_1.0> sudo dnf versionlock add iopsys

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-2018-20487?

iopsys: upgrade to newer than 3.16. Exact commands for each OS are on this page.

Is CVE-2018-20487 being exploited?

CVE-2018-20487 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-2018-20487 affect?

CVE-2018-20487 affects iopsys. Severity is high (CVSS 8.8). An issue was discovered in the firewall3 component in Inteno IOPSYS 1.0 through 3.16. The attacker must make a JSON-RPC method call to add a firewall rule as an "include" and point the "path" argument to a malicious script or binary. This g

How urgent is CVE-2018-20487?

Priority 56/100. High severity; Public exploit reference

Related CVEs

CVE-2017-17867 HIGH 8.8 UPGRADE Inteno iopsys 2.0-3.14 and 4.0 devices allow remote authenticated users to execute arbitrary OS commands by mo

References

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