CVE-2020-24686 AC500 V2 webserver denial of service vulnerability
Attackers can cause the ABB AC500 V2 PLC web visualization component to stop responding, denying remote visibility to legitimate users.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-24686?
CVE-2020-24686 is a high-severity denial of service vulnerability in ABB AC500 V2 products with onboard Ethernet, published on 26 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-400
Which versions are affected by CVE-2020-24686?
It affects 6 products.
Products include Abb Pm554 Firmware, Abb Pm556 Firmware, Abb Pm564 Firmware, Abb Pm566 Firmware, Abb Pm572 Firmware, Abb Pm573 Firmware.
How do I fix CVE-2020-24686?
No fix has been published for CVE-2020-24686 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2020-24686 being exploited?
There is no known exploitation of CVE-2020-24686 in the wild and no public exploit code.
Sources
Also known as GHSA-9f9p-5j8g-3cmm.