How severe is CVE-2021-20836?

CVE-2021-20836 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-20836 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20836?

CVE-2021-20836 primarily affects Omron Cx-supervisor. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-20836?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-20836 published?

CVE-2021-20836 was published on 2021-10-19 and last updated on 2026-06-17.

CVE-2021-20836

CVE-2021-20836 is a medium-severity vulnerability in Omron Cx-supervisor with a CVSS 3.x base score of 6.5. 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-125.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 6.0
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Omron Cx-supervisor
Published: 2021-10-19
Last modified: 2026-06-17

Description

Out-of-bounds read vulnerability in CX-Supervisor v4.0.0.13 and v4.0.0.16 allows an attacker with administrative privileges to cause information disclosure and/or arbitrary code execution by opening a specially crafted SCS project files.

Frequently asked questions

What is CVE-2021-20836?: Out-of-bounds read vulnerability in CX-Supervisor v4.0.0.13 and v4.0.0.16 allows an attacker with administrative privileges to cause information disclosure and/or arbitrary code execution by opening a specially crafted SCS project files.
How severe is CVE-2021-20836?: CVE-2021-20836 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-20836 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20836?: CVE-2021-20836 primarily affects Omron Cx-supervisor. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-20836?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-20836 published?: CVE-2021-20836 was published on 2021-10-19 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:omron:cx-supervisor:4.0.0.13:*:*:*:*:*:*:*
cpe:2.3:a:omron:cx-supervisor:4.0.0.16:*:*:*:*:*:*:*

More vulnerabilities in Omron Cx-supervisor

CVE-2019-18251 — High (CVSS 8.8): In Omron CX-Supervisor, Versions 3.5 (12) and prior, Omron CX-Supervisor ships with Teamviewer Version 5.0.8703 QS.…
CVE-2018-19017 — High (CVSS 8.8): Several use after free vulnerabilities have been identified in CX-Supervisor (Versions 3.42 and prior). When processing…
CVE-2018-19011 — High (CVSS 8.8): CX-Supervisor (Versions 3.42 and prior) can execute code that has been injected into a project file. An attacker could…
CVE-2018-17913 — High (CVSS 7.8): A type confusion vulnerability exists when processing project files in Omron CX-Supervisor Versions 3.4.1.0 and prior,…
CVE-2018-17909 — High (CVSS 7.8): When processing project files in Omron CX-Supervisor Versions 3.4.1.0 and prior, the application fails to check if it…
CVE-2018-17905 — High (CVSS 7.8): When processing project files in Omron CX-Supervisor Versions 3.4.1.0 and prior and tampering with a specific byte,…

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Other CWE-125 (Out-of-bounds Read) vulnerabilities

CVE-2026-24826 — Critical (CVSS 10.0): Out-of-bounds Write, Divide By Zero, NULL Pointer Dereference, Use of Uninitialized Resource, Out-of-bounds Read,…
CVE-2024-22004 — Critical (CVSS 10.0): Due to length check, an attacker with privilege access on a Linux Nonsecure operating system can trigger a…
CVE-2021-41556 — Critical (CVSS 10.0): sqclass.cpp in Squirrel through 2.2.5 and 3.x through 3.1 allows an out-of-bounds read (in the core interpreter) that…
CVE-2021-21777 — Critical (CVSS 10.0): An information disclosure vulnerability exists in the Ethernet/IP UDP handler functionality of EIP Stack Group OpENer…
CVE-2017-14451 — Critical (CVSS 10.0): An exploitable out-of-bounds read vulnerability exists in libevm (Ethereum Virtual Machine) of CPP-Ethereum. A…
CVE-2013-0767 — Critical (CVSS 10.0): The nsSVGPathElement::GetPathLengthScale function in Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and…

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