# CVE-2020-8479

## Summary

- **CVE ID:** CVE-2020-8479
- **Severity:** CRITICAL
- **CVSS Score:** 9.4 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L)
- **CWE:** CWE-91
- **Published:** Apr 29, 2020
- **Last Modified:** Mar 14, 2026

## 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. an XML External Entity Injection vulnerability exists that allows an attacker to read or call arbitrary files from the license server and/or from the network and also block the license handling.

## Affected Products

- ABB — Central Licensing System (5.1)
- ABB — ABB Ability System 800xA (5.1)
- ABB — ABB Ability System 800xA (6.0)
- ABB — ABB Ability System 800xA (6.1)
- ABB — Compact HMI (5.1)
- ABB — Compact HMI (6.0)
- ABB — Control Builder Safe (1.0)
- ABB — Control Builder Safe (1.1)
- ABB — Control Builder Safe (2.0)
- ABB — Symphony Plus S+ Operations (3)
- ABB — Symphony Plus S+ Engineering  (1.1)
- ABB — Composer Harmony (5.1)
- ABB — Composer Harmony (6.0)
- ABB — Composer Harmony (6.1)
- ABB — Composer Melody  (5.3)
- ABB — Composer Melody  (6)
- ABB — Harmony OPC Server Standalone (6.0)
- ABB — Harmony OPC Server Standalone (6.1)
- ABB — Harmony OPC Server Standalone (7.0)
- ABB — Advant OCS Control Builder A (1.3)
- ABB — Advant OCS Control Builder A (1.4)
- ABB — Composer CTK (6.1)
- ABB — Composer CTK (6.2)
- ABB — AdvaBuild (3.7 SP1)
- ABB — AdvaBuild (3.7 SP2)
- ABB — OPC Server for Mod 300 (non-800xA) (1.4)
- ABB — OPC Data Link (2.1)
- ABB — OPC Data Link (2.2)
- ABB — Knowledge Manager (8.0)
- ABB — Knowledge Manager (9.0)
- ABB — Knowledge Manager (9.1)
- ABB — Manufacturing Operations Management (1812)
- ABB — Manufacturing Operations Management (1909)
- ABB — Advant  OCS AC 100 OPS Server (5.1)
- ABB — Advant  OCS AC 100 OPS Server (6.0)
- ABB — Advant  OCS AC 100 OPS Server (6.1)
- ABB — ABB  Ability™ SCADAvantage (5.1)
- ABB — ABB  Ability™ SCADAvantage (unspecified)
- ABB — Symphony Plus S+ Engineering (1.1)
- ABB — Composer Melody (5.3)
- ABB — Composer Melody (6)

## References

- [CNA](https://search.abb.com/library/Download.aspx?DocumentID=2PAA121231&LanguageCode=en&DocumentPartId=&Action=Launch)
- [CNA](https://search.abb.com/library/Download.aspx?DocumentID=2PAA121230&LanguageCode=en&DocumentPartId=&Action=Launch)
- [CNA](https://search.abb.com/library/Download.aspx?DocumentID=3CCA2020-003309&LanguageCode=en&DocumentPartId=&Action=Launch)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.49%
- **EPSS Percentile:** 65.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._