CVE-2020-24685

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.

• CWE-789
• CWE-770

• https://search.abb.com/library/Download.aspx?DocumentID=3ADR010667&LanguageCode=en&DocumentPartId=&Action=LaunchPatch, Vendor Advisory
• https://search.abb.com/library/Download.aspx?DocumentID=3ADR010667&LanguageCode=en&DocumentPartId=&Action=LaunchPatch, Vendor Advisory

Published

Feb 9, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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