CVE-2021-22284SECURITY - OPC Server for AC 800M - Remote Code Execution Vulnerability
- 8.4HighCVSS base score
- 0.83%Exploitation in 30 daysEPSS · top 42% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By ABB
- 13 months later
· 13 months later
Published
- 3 years later
· 3 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| ABBCNA (assigner) | 3.1 | High8.4 | CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.83% · top 42% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.4.
Affected products
ABB · 800xA, Control Software for AC 800M OPC Server for AC 800M
- affected unspecified – ≤ 5.1.0-x
- affected unspecified – ≤ 5.1.1-x
- affected 6.0.0-1
- affected 6.0.0-2
- affected 6.0.0-3
ABB · Control Builder Safe, version 1.x OPC Server for AC 800M
- affected 5.1.1-1
ABB · Control Builder Safe, version 2.0 OPC Server for AC 800M
- affected 6.0.0-1
ABB · Compact Product Suite - Control and I/O OPC Server for AC 800M
- affected unspecified – ≤ 5.1.0-x
- affected unspecified – ≤ 5.1.1-x
- affected unspecified – ≤ 6.0.0-x
What to do
Solution: Customers on version 5.1 or older are recommended to upgrade to a supported version that is not affected by this issue such as version 6.1 or later.
References
References1
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2021-9430 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2021-22284)Record last updated .