What is CVE-2016-4820?

CVE-2016-4820 is a high-severity vulnerability in Iodata Etx-R, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2016-06-19.

How severe is CVE-2016-4820?

High severity. CVSS v3 base score is 8.8 out of 10.

CSRF in Iodata Etx-R

CVE-2016-4820

Cross-site request forgery (CSRF) vulnerability on I-O DATA DEVICE ETX-R devices allows remote attackers to hijack the authentication of arbitrary users.

Vulnerability class: CSRF (Cross-Site Request Forgery)

Published 2016-06-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (48.1th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

jvndb.jvn.jp/jvndb/JVNDB-2016-000100 (Vendor Advisory, third-party-advisory)
www.iodata.jp/support/information/2016/etx-r/ (Vendor Advisory)
jvn.jp/en/jp/JVN61317238/index.html (Vendor Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2016-4820?: CVE-2016-4820 is a high-severity vulnerability in Iodata Etx-R, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2016-06-19.
How severe is CVE-2016-4820?: High severity. CVSS v3 base score is 8.8 out of 10.