CVE-2018-5447: An Improper Input Validation issue was discovered in Nari PCS-9611 relay

This week

CRITICAL 9.8REMOTEMITIGATE

CVE-2018-5447 is a critical-severity flaw (CVSS 9.8) affecting pcs-9611 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An Improper Input Validation issue was discovered in Nari PCS-9611 relay. An improper input validation vulnerability has been identified that affects a service within the software that may allow a remote attacker to arbitrarily read/access system resources and affect the availability of the system.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-20
Published	2018-01-25
Last modified	2026-06-17

Publisher (CNA): ICS-CERT · Vendor: nrec

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

Am I affected?

Timeline

2018-01-25 22:29 UTCPublished CVE record published
2026-06-17 02:00 UTCUpdated Record last modified

nrec pcs-9611 firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

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.

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-2018-5447?

pcs-9611 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-5447 being exploited?

CVE-2018-5447 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-2018-5447 affect?

CVE-2018-5447 affects pcs-9611 firmware. Severity is critical (CVSS 9.8). An Improper Input Validation issue was discovered in Nari PCS-9611 relay. An improper input validation vulnerability has been identified that affects a service within the software that may allow a remote attacker to arbitrarily read/access

How urgent is CVE-2018-5447?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

References

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