---
id: "CVE-2021-38406"
kind: "vulnerability"
aliases: ["CVE-2021-38406"]
title: "deltaww dopsoft: Delta Electronic DOPSoft 2 (Version 2.00.07 and prior) lacks proper validation of user-supplied data when parsing\u2026"
severity: "high"
cvss: 7.8
epss: 0.76428
exploited: true
status: "open"
category: "infrastructure"
products: [{"name": "Delta Electronics DOPSoft 2", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "deltaww dopsoft", "fixed": [], "affected": ">= 2.00, <= 2.00.07", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["delta-electronics", "exploited", "industrial-control", "infrastructure", "plc", "windows"]
not_affected_if: ["dopsoft-not-installed"]
published_at: "2021-09-17T19:15:08+00:00"
first_seen_at: "2026-10-23T19:11:52+00:00"
updated_at: "2026-10-23T22:29:04+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-38406", "first_seen_at": "2026-10-23T19:11:52+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2021-38406", "first_seen_at": "2026-10-23T19:13:45+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-38406", "first_seen_at": "2026-10-23T22:29:04+00:00"}]
---

# deltaww dopsoft: Delta Electronic DOPSoft 2 (Version 2.00.07 and prior) lacks proper validation of user-supplied data when parsing…

Delta Electronics DOPSoft 2, an industrial PLC programming tool, mishandles certain project files, causing an out-of-bounds write. An attacker who gets a crafted project file opened can run code on the engineering workstation.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Delta Electronics DOPSoft 2 affected ? fixed ?
- vendor:deltaww dopsoft affected >= 2.00, <= 2.00.07 fixed ?

## How to check

Check whether DOPSoft 2 is installed on any engineering or HMI workstation, for example by searching for DOPSoft2 in installed programs.

## Fix

CISA says the product is end-of-life and should be disconnected if still in use; no patched version is named in the sources.

## Timeline

- 2026-10-23T19:11:52+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-38406
- 2026-10-23T19:13:45+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2021-38406
- 2026-10-23T22:29:04+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2021-38406

## From the sources

Delta Electronics DOPSoft 2 lacks proper validation of user-supplied data when parsing specific project files (improper input validation) resulting in an out-of-bounds write that allows for code execution.

CISA required action: The impacted product is end-of-life and should be disconnected if still in use.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_