Moxa IKS and EDS does not properly check authority on server side, which results in a read-only user being able to perform arbitrary config…

published 2019-03-05 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-16079

cvss: 7.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.7%; EPSS 1.7% chance of exploitation in 30 days, percentile 76%
public exploits: 0; none known

Moxa IKS and EDS does not properly check authority on server side, which results in a read-only user being able to perform arbitrary configuration changes.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-19-057-01 updated 2019-10-24 cvss 9.1

Moxa IKS, EDS (Update A)

Moxa EDS-405A series <= 3.8 Moxa EDS-408A series <= 3.8 Moxa EDS-510A series <= 3.8 Moxa IKS-G6824A series <= 5.6
affected: mitigation “Install firmware patch. Patches may be requested from Moxa Customer Service (login required):” moxa.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

1.67% chance of exploitation in the next 30 days, higher than 76% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:P/A:N

Affected products

ICS-CERT Moxa IKS, EDS

Classification

Weakness

CWE-284 Improper Access Control

References

ics-cert.us-cert.gov /advisories/ICSA-19-057-01
third-party-advisory, us-government-resource
securityfocus.com /bid/107178
vdb-entry, third-party-advisory

Sources

CVE List CVE-2019-6520
NVD CVE-2019-6520

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary