CVE-2020-8476ABB Central Licensing System - Elevation of Privilege Vulnerability
- 5.3MediumCVSS base score
- 1.5%Exploitation in 30 daysEPSS · top 25% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
For the Central Licensing Server component used in ABB products ABB Ability™ System 800xA and related system extensions versions 5.1, 6.0 and 6.1, Compact HMI versions 5.1 and 6.0, Control Builder Safe 1.0, 1.1 and 2.0, Symphony Plus -S+ Operations 3.0 to 3.2 Symphony Plus -S+ Engineering 1.1 to 2.2, Composer Harmony 5.1, 6.0 and 6.1, Melody Composer 5.3, 6.1/6.2 and SPE for Melody 1.0SPx (Composer 6.3), Harmony OPC Server (HAOPC) Standalone 6.0, 6.1 and 7.0, ABB Ability™ System 800xA/ Advant® OCS Control Builder A 1.3 and 1.4, Advant® OCS AC100 OPC Server 5.1, 6.0 and 6.1, Composer CTK 6.1 and 6.2, AdvaBuild 3.7 SP1 and SP2, OPCServer for MOD 300 (non-800xA) 1.4, OPC Data Link 2.1 and 2.2, Knowledge Manager 8.0, 9.0 and 9.1, Manufacturing Operations Management 1812 and 1909, ABB AbilityTM SCADAvantage versions 5.1 to 5.6.5, a weakness in validation of input exists that allows an attacker to alter licenses assigned to the system nodes by sending specially crafted messages to the CLS web service.
Timeline
ID reserved
By ABB
- 3 months later
· 3 months later
Published
- 4 years later
· 4 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 | Medium5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| NVDNVD · Modified | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
- EPSS (exploitation in 30 days)
- 1.5% · top 25% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.
Affected products
ABB · Central Licensing System
- affected 5.1 – < 5*
ABB · ABB Ability System 800xA
- affected 5.1
- affected 6.0
- affected 6.1
- affected 5.1
- affected 6.0
- affected 1.0
- affected 1.1
- affected 2.0
ABB · Symphony Plus S+ Operations
- affected 3 – ≤ 3.2
ABB · Symphony Plus S+ Engineering
- affected 1.1 – ≤ 2.2
- affected 5.1
- affected 6.0
- affected 6.1
- affected 5.3
- affected 6 – ≤ 6.3
ABB · Harmony OPC Server Standalone
- affected 6.0
- affected 6.1
- affected 7.0
ABB · Advant OCS Control Builder A
- affected 1.3
- affected 1.4
- affected 6.1
- affected 6.2
- affected 3.7 SP1
- affected 3.7 SP2
ABB · OPC Server for Mod 300 (non-800xA)
- affected 1.4
- affected 2.1
- affected 2.2
- affected 8.0
- affected 9.0
- affected 9.1
ABB · Manufacturing Operations Management
- affected 1812
- affected 1909
ABB · Advant OCS AC 100 OPS Server
- affected 5.1
- affected 6.0
- affected 6.1
ABB · ABB Ability™ SCADAvantage
- affected 5.1 – < unspecified
- affected unspecified – ≤ 5.6.5
References
References3
- https://search.abb.com/library/Download.aspx?DocumentID=2PAA121231&LanguageCode=en&DocumentPartId=&Action=Launch (opens in a new tab)x_transferred
- https://search.abb.com/library/Download.aspx?DocumentID=2PAA121230&LanguageCode=en&DocumentPartId=&Action=Launch (opens in a new tab)x_transferred
- https://search.abb.com/library/Download.aspx?DocumentID=3CCA2020-003309&LanguageCode=en&DocumentPartId=&Action=Launch (opens in a new tab)x_transferred
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-2020-29342 (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-2020-8476)Record last updated .