CVE-2020-24685 - CVE House
Back to Database
Status published High CVE-2020-24685

AC500 V2 unauthenticated crafter packet vulnerability

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2020-24685

Credits & Attribution

No credits recorded in the NVD database.

References

More from ABB

View All →
CVE-2025-9970
Application credential stored in clear text in memory
Medium 5.7
CVE-2025-9574
Missing Authentication Vulnerability
Critical 9.9
CVE-2025-8754
ABB AbilityTM zenon Remote Transport Vulnerability
High 8.7
CVE-2025-7745
Modbus TCP buffer overread
Medium 6.9
CVE-2025-7705
Authentication bypass due to compatibility mode enabled by default
High 8.6

Affected Vendor

Affected Software

AC500 V2 products with onboard Ethernet
Vulnerable Versions:
version 2.8.4 and prior versions

Timeline

Official Publish: February 9th, 2021
Last Modified: August 4th, 2024
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Weaknesses (CWE)

CWE-789

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.