Skip to content
Fencer Vulns
high 8.4

CVE-2021-22284 json

SECURITY - OPC Server for AC 800M - Remote Code Execution Vulnerability

published 2022-02-04 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-9430

cvss
8.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 57%
public exploits
0
none known

Summary

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.

Patch / fix

  • abb opc_server_for_ac_800m 6.0.0-4

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-22-074-01 updated cvss 8.4

ABB OPC Server for AC 800M

  • ABB OPC Server for AC 800M 5.1.0-x, 5.1.1-x, >= 6.0.0-1, <= 6.0.0-3, 5.1.1-1, 6.0.0-1, 5.1.0-x, 5.1.1-x, 6.0.0-x
    affected: mitigation “800xA control software for AC 800M to v6.1.0-0 or later.” search.abb.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

0.83% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.4 CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.5 AV:N/AC:L/Au:S/C:P/I:P/A:P

Affected products

  • 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
  • ABB Compact Product Suite - Control and I/O OPC Server for AC 800M

Classification

Weakness
  • CWE-732 Incorrect Permission Assignment for Critical Resource

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.