CVE-2020-25241 Denial of service in SIMATIC MV400 family
An attacker can terminate arbitrary TCP sessions by exploiting improper validation of TCP RST sequence numbers in SIMATIC MV400 devices.
- 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-2020-25241?
CVE-2020-25241 is a high-severity denial of service vulnerability in Siemens SIMATIC MV400 family, published on 15 Mar 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability has been identified in SIMATIC MV400 family (All Versions < V7.0.6). The underlying TCP stack of the affected products does not correctly validate the sequence number for incoming TCP RST packages. An attacker could exploit this to terminate arbitrary TCP sessions.
Which versions are affected by CVE-2020-25241?
It affects 7 products.
Products include Siemens Simatic Mv420 Sr-B Body Firmware, Siemens Simatic Mv420 Sr-B Firmware, Siemens Simatic Mv420 Sr-P Body Firmware, Siemens Simatic Mv420 Sr-P Firmware, Siemens Simatic Mv440 Hr Firmware, Siemens Simatic Mv440 Sr Firmware and 1 more.
How do I fix CVE-2020-25241?
No fix has been published for CVE-2020-25241 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-2020-25241 being exploited?
There is no known exploitation of CVE-2020-25241 in the wild and no public exploit code.
Sources
Also known as GHSA-hgp9-8qfr-qjj7.