How severe is CVE-2020-27259?

CVE-2020-27259 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-27259 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-27259?

CVE-2020-27259 primarily affects Omron Cx-one. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-27259?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-27259 published?

CVE-2020-27259 was published on 2021-02-09 and last updated on 2026-06-17.

CVE-2020-27259

CVE-2020-27259 is a high-severity vulnerability in Omron Cx-one with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-822.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.8
EPSS exploit prediction: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-822
Affected product: Omron Cx-one
Published: 2021-02-09
Last modified: 2026-06-17

Description

The Omron CX-One Version 4.60 and prior may allow an attacker to supply a pointer to arbitrary memory locations, which may allow an attacker to remotely execute arbitrary code.

Frequently asked questions

What is CVE-2020-27259?: The Omron CX-One Version 4.60 and prior may allow an attacker to supply a pointer to arbitrary memory locations, which may allow an attacker to remotely execute arbitrary code.
How severe is CVE-2020-27259?: CVE-2020-27259 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-27259 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-27259?: CVE-2020-27259 primarily affects Omron Cx-one. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-27259?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-27259 published?: CVE-2020-27259 was published on 2021-02-09 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:a:omron:cx-one:*:*:*:*:*:*:*:*
cpe:2.3:a:omron:cx-position:*:*:*:*:*:*:*:*
cpe:2.3:a:omron:cx-protocol:*:*:*:*:*:*:*:*
cpe:2.3:a:omron:cx-server:*:*:*:*:*:*:*:*

More vulnerabilities in Omron Cx-one

CVE-2020-27261 — High (CVSS 8.8): The Omron CX-One Version 4.60 and prior is vulnerable to a stack-based buffer overflow, which may allow an attacker to…
CVE-2022-21137 — High (CVSS 7.8): Omron CX-One Versions 4.60 and prior are vulnerable to a stack-based buffer overflow while processing specific project…
CVE-2021-27413 — High (CVSS 7.8): Omron CX-One Versions 4.60 and prior, including CX-Server Versions 5.0.29.0 and prior, are vulnerable to a stack-based…
CVE-2020-27257 — High (CVSS 7.8): This vulnerability allows local attackers to execute arbitrary code due to the lack of proper validation of…
CVE-2018-19027 — High (CVSS 7.8): Three type confusion vulnerabilities exist in CX-One Versions 4.50 and prior and CX-Protocol Versions 2.0 and prior…
CVE-2018-18993 — High (CVSS 7.8): Two stack-based buffer overflow vulnerabilities have been discovered in CX-One Versions 4.42 and prior (CX-Programmer…

All CVEs affecting Omron Cx-one →

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CVE-2025-4993 — Critical (CVSS 9.1): Untrusted Pointer Dereference vulnerability in RTI Connext Professional (Core Libraries) allows Pointer…
CVE-2025-1255 — Critical (CVSS 9.1): Untrusted Pointer Dereference vulnerability in RTI Connext Professional (Core Libraries) allows Pointer…
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