CVE-2020-8475ABB Central Licensing System - Denial of Service Vulnerability
- 5.3MediumCVSS base score
- 1.2%Exploitation in 30 daysEPSS · top 33% 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 block license handling 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:N/A:H |
- EPSS (exploitation in 30 days)
- 1.2% · top 33% of all CVEs (13 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-2020-29341 (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-2020-8475)Record last updated .