CVE-2018-16591: FURUNO FELCOM 250 and 500 devices allow unauthenticated users to change the password for the Admin, Log and Se

This week

CRITICAL 9.8REMOTEMITIGATEMITIGATE

CVE-2018-16591 is a critical-severity flaw (CVSS 9.8) affecting felcom 250 firmware, felcom 500 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

FURUNO FELCOM 250 and 500 devices allow unauthenticated users to change the password for the Admin, Log and Service accounts, as well as the password for the protected "SMS" panel via /cgi-bin/sm_changepassword.cgi and /cgi-bin/sm_sms_changepasswd.cgi.

Why this priority

Critical 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	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.2% (top 18%)
CISA exploited list	No
Weakness	CWE-862
Published	2018-09-10
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: furuno

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

Am I affected?

Timeline

2018-09-10 17:29 UTCPublished CVE record published
2026-06-17 01:44 UTCUpdated Record last modified

furuno felcom 250 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.

furuno felcom 500 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-2018-16591?

felcom 250 firmware: mitigate or apply the listed mitigation; felcom 500 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-16591 being exploited?

CVE-2018-16591 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-2018-16591 affect?

CVE-2018-16591 affects felcom 250 firmware, felcom 500 firmware. Severity is critical (CVSS 9.8). FURUNO FELCOM 250 and 500 devices allow unauthenticated users to change the password for the Admin, Log and Service accounts, as well as the password for the protected "SMS" panel via /cgi-bin/sm_changepassword.cgi and /cgi-bin/sm_sms_chang

How urgent is CVE-2018-16591?

Priority 65/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2018-16705 CRITICAL 9.8 MITIGATE MITIGATE FURUNO FELCOM 250 and 500 devices allow unauthenticated access to the xml/permission.xml file containing all o
CVE-2018-16590 CRITICAL 9.8 MITIGATE MITIGATE FURUNO FELCOM 250 and 500 devices use only client-side JavaScript in login.js for authentication.

References

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