Omron CX-One

published 2021-02-09 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-19774

cvss: 8.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 7.9%; EPSS 7.9% chance of exploitation in 30 days, percentile 94%
public exploits: 0; none known

The Omron CX-One Version 4.60 and prior is vulnerable to a stack-based buffer overflow, which may allow an attacker to remotely execute arbitrary code.

Vendor advisories

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

cisa ICSA-21-007-02 updated 2021-01-07 cvss 7.8

Omron CX-One

Omron CX-Position <= 2.52 Omron CX-Protocol <= 2.02 Omron CX-Server <= 5.0.28
affected: vendor fix, mitigation

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

7.94% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD	2.0	6.8	AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

Omron CX-One
Omron CX-Protocol
Omron CX-Server
Omron CX-Position

Classification

Weakness

CWE-121 Stack-based Buffer Overflow
CWE-787 Out-of-bounds Write

References

us-cert.cisa.gov /ics/advisories/icsa-21-007-02
third-party-advisory, us-government-resource
zerodayinitiative.com /advisories/ZDI-21-183/
third-party-advisory
zerodayinitiative.com /advisories/ZDI-21-185/
third-party-advisory

Sources

CVE List CVE-2020-27261
NVD CVE-2020-27261

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