How severe is CVE-2023-22421?

CVE-2023-22421 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-22421 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-22421?

CVE-2023-22421 affects Jtekt Kostac Plc Programming Software. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-22421?

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-2023-22421 published?

CVE-2023-22421 was published on 2023-03-06 and last updated on 2026-06-17.

CVE-2023-22421

CVE-2023-22421 is a high-severity vulnerability in Jtekt Kostac Plc Programming Software with a CVSS 3.x base score of 7.8. 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-125.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 0% (24th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Jtekt Kostac Plc Programming Software
Published: 2023-03-06
Last modified: 2026-06-17

Description

Out-of-bounds read vulnerability exists in Kostac PLC Programming Software (Former name: Koyo PLC Programming Software) Version 1.6.9.0 and earlier. The insufficient buffer size for the PLC program instructions leads to out-of-bounds read. As a result, opening a specially crafted project file may lead to information disclosure and/or arbitrary code execution.

Frequently asked questions

What is CVE-2023-22421?: Out-of-bounds read vulnerability exists in Kostac PLC Programming Software (Former name: Koyo PLC Programming Software) Version 1.6.9.0 and earlier. The insufficient buffer size for the PLC program instructions leads to out-of-bounds read. As a result, opening a specially crafted project file may lead to information disclosure and/or arbitrary code execution.
How severe is CVE-2023-22421?: CVE-2023-22421 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-22421 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-22421?: CVE-2023-22421 affects Jtekt Kostac Plc Programming Software. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-22421?: 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-2023-22421 published?: CVE-2023-22421 was published on 2023-03-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:jtekt:kostac_plc_programming_software:*:*:*:*:*:*:*:*

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