What is CVE-2018-16591?

CVE-2018-16591 is a critical-severity vulnerability in Furuno Felcom 250, classified under Missing Authorization. CVSS score: 9.8/10. Published 2018-09-10.

How severe is CVE-2018-16591?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Furuno Felcom 250

CVE-2018-16591

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.

Vulnerability class: Broken Access Control

Published 2018-09-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.022 (81.6th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 81.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.022 · newest: 0.022 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

cyberskr.com/blog/furuno-felcom.html (Technical Description, Exploit, Third Party Advisory)
gist.github.com/CyberSKR/2c30d964d48b5e1518ded88bd953b710 (Third Party Advisory)

Frequently asked questions

What is CVE-2018-16591?: CVE-2018-16591 is a critical-severity vulnerability in Furuno Felcom 250, classified under Missing Authorization. CVSS score: 9.8/10. Published 2018-09-10.
How severe is CVE-2018-16591?: Critical severity. CVSS v3 base score is 9.8 out of 10.