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High severity8.6NVD Advisory· Published Feb 9, 2021· Updated Jun 17, 2026

CVE-2020-24685

CVE-2020-24685

Description

An unauthenticated specially crafted packet sent by an attacker over the network will cause a denial-of-service (DoS) vulnerability. Vulnerability allows attacker to stop the PLC. After stopping (ERR LED flashing red), physical access to the PLC is required in order to restart the application. This issue affects: ABB AC500 V2 products with onboard Ethernet version 2.8.4 and prior versions.

Affected products

3
  • Abb/Ac500 Cpu Firmware
    cpe:2.3:o:abb:ac500_cpu_firmware:*:*:*:*:*:*:*:*
    Range: <2.8.5
  • Abb/AC500 V2llm-fuzzy
    Range: <=2.8.4
  • ABB/AC500 V2 products with onboard Ethernetv5
    Range: version 2.8.4 and prior versions

Patches

Vulnerability mechanics

References

1

News mentions

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