CVE-2020-24685 AC500 V2 unauthenticated crafter packet vulnerability
An unauthenticated attacker can send a crafted packet to cause a denial-of-service on ABB AC500 V2 PLCs, requiring physical access to restart.
- 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-2020-24685?
CVE-2020-24685 is a high-severity denial of service vulnerability in ABB AC500 V2 products with onboard Ethernet, published on 9 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2020-24685?
It affects 1 product.
Products include Abb Ac500 Cpu Firmware.
How do I fix CVE-2020-24685?
No fix has been published for CVE-2020-24685 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-2020-24685 being exploited?
There is no known exploitation of CVE-2020-24685 in the wild and no public exploit code.
Other vulnerabilities in ABB AC500 V2 products with onboard Ethernet
Sources
Also known as GHSA-cvwc-6hv2-wv97.