CVE-2023-22421

Code execution via undersized instruction buffer

Published Mar 5, 2023 · Updated Mar 7, 2025

Out-of-bounds read in JTEKT Kostac PLC Programming Software 1.6.9.0 and earlier allows attackers to execute code via a crafted project file. The project-file parser allocates an insufficient buffer for PLC program instructions and reads beyond that buffer while processing them. Exploitation requires a user to open the crafted file, exposing process memory and enabling arbitrary code execution in the user's application context.

CVSS severity7.8
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds read in JTEKT Kostac PLC Programming Software 1.6.9.0 and earlier allows attackers to execute code via a crafted project file. The project-file parser allocates an insufficient buffer for PLC program instructions and reads beyond that buffer while processing them. Exploitation requires a user to open the crafted file, exposing process memory and enabling arbitrary code execution in the user's application context.

The record

CVE
CVE-2023-22421
Published
Mar 5, 2023
Updated
Mar 7, 2025
Vendor
JTEKT ELECTRONICS CORPORATION
Product
Kostac PLC Programming Software
Classifications
CWE-125, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 5, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 7, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Version 1.6.9.0 and earlier

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

JTEKT ELECTRONICS CORPORATION · Kostac PLC Programming Softwareversion=Version 1.6.9.0 and earlier

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo