CVE-2020-8475

Status: ModifiedHigh (7.5)—
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.
CVSS

Version: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base score: 7.5
Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 1.15%
Percentile among all scored CVEs: 66
Score date: 10/4/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
Affected technologies (3)

ABB — 800xa System ABB — Compact HMI ABB — Control Builder Safe
CWEs

CWE-20
CWE-20
References

Raw JSON (NVD)

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{
  "id": "CVE-2020-8475",
  "cveTags": [],
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      "tags": [
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      "type": "Secondary",
      "source": "cybersecurity@ch.abb.com",
      "description": [
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          "lang": "en",
          "value": "CWE-20"
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      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-20"
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  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "Para el componente Central Licensing Server utilizado en los productos ABB Ability™ System 800xA y las extensiones del sistema relacionadas, versiones 5.1, 6.0 y 6.1, Compact HMI versiones 5.1 y 6.0, Control Builder Safe 1.0, 1.1 y 2.0, Symphony Plus -S+ Operations 3.0 a 3. 2 Symphony Plus -S+ Engineering 1.1 a 2.2, Composer Harmony 5.1, 6.0 y 6.1, Melody Composer 5.3, 6.1/6.2 y SPE para Melody 1.0SPx (Composer 6.3), Harmony OPC Server (HAOPC) Standalone 6.0, 6.1 y 7.0, ABB Ability™ System 800xA/ Advant® OCS Control Builder A 1. 3 y 1.4, Advant® OCS AC100 OPC Server 5.1, 6.0 y 6.1, Composer CTK 6.1 y 6.2, AdvaBuild 3.7 SP1 y SP2, OPCServer for MOD 300 (non-800xA) 1.4, OPC Data Link 2.1 y 2.2, Knowledge Manager 8.0, 9.0 y 9. 1, Manufacturing Operations Management 1812 y 1909, ABB AbilityTM SCADAvantage versiones 5.1 a 5.6.5, existe una debilidad en la validación de la entrada que permite a un atacante bloquear la gestión de licencias enviando mensajes especialmente diseñados al servicio web CLS"
    }
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  "lastModified": "2026-06-17T03:26:26.310",
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