CVE-2020-24686

AC500 V2 webserver denial of service vulnerability

HIGH
7.5
CVSS Score
Published: February 26, 2021 at 03:10 PM UTC
Updated: June 17, 2026 at 03:05 AM UTC
13 products affected across 1 vendorPM566 FirmwarePM556 FirmwarePM573 Firmware

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Severity
HIGH7.5
Exploit prediction
EPSS 2%

Description

The vulnerabilities can be exploited to cause the web visualization component of the PLC to stop and not respond, leading to genuine users losing remote visibility of the PLC state. If a user attempts to login to the PLC while this vulnerability is exploited, the PLC will show an error state and refuse connections to Automation Builder. The execution of the PLC application is not affected by this vulnerability. This issue affects ABB AC500 V2 products with onboard Ethernet.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

All versions
abb-pm554 (same device)
All versions
abb-pm556 (same device)
All versions
abb-pm564 (same device)
All versions
abb-pm566 (same device)
All versions
abb-pm572 (same device)
All versions
abb-pm573 (same device)
80%
All versions
80%
All versions
80%
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

7.5HIGHABB
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-400

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