CVE-2021-37172 Auth bypass in SIMATIC S7-1200 CPU family (incl. SIPLUS variants)
Attackers can bypass authentication to download arbitrary programs to SIMATIC S7-1200 PLCs if provisioned with TIA Portal V13.
- 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-2021-37172?
CVE-2021-37172 is a high-severity authentication bypass vulnerability in Siemens SIMATIC S7-1200 CPU family (incl. SIPLUS variants), published on 10 Aug 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 S7-1200 CPU family (incl. SIPLUS variants) (V4.5.0). Affected devices fail to authenticate against configured passwords when provisioned using TIA Portal V13. This could allow an attacker using TIA Portal V13 or later versions to bypass authentication and download arbitrary programs to the PLC. The vulnerability does not occur when TIA Portal V13 SP1 or any later version was used to provision the device.
Weakness: CWE-287
Which versions are affected by CVE-2021-37172?
It affects 2 products.
Products include Siemens Simatic S7-1200 Cpu Firmware, Siemens Simatic Step 7 \(Tia Portal\).
How do I fix CVE-2021-37172?
No fix has been published for CVE-2021-37172 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2021-37172 being exploited?
There is no known exploitation of CVE-2021-37172 in the wild and no public exploit code.
Sources
Also known as GHSA-jx4h-7jg8-gqhf.