CVE-2020-22552 Denial of service in n/a
A crafted packet with specific COTP flags causes the Snap7 server to crash, resulting in a denial of service.
- 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-2020-22552?
CVE-2020-22552 is a high-severity denial of service vulnerability in n/a, published on 28 Oct 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Snap7 server component in version 1.4.1, when an attacker sends a crafted packet with COTP protocol the last-data-unit flag set to No and S7 writes a var function, the Snap7 server will be crashed.
Which versions are affected by CVE-2020-22552?
It affects 1 product.
Products include Snap7 Project Snap7.
How do I fix CVE-2020-22552?
No fix has been published for CVE-2020-22552 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-2020-22552 being exploited?
There is no known exploitation of CVE-2020-22552 in the wild and no public exploit code.
Sources
Also known as GHSA-c87p-2q2j-cwwp.