CVE-2021-40363 Weak cryptography in SIMATIC PCS 7 V8.2
An attacker can brute force credentials stored with weak encryption in project files to take over the system.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-40363?
CVE-2021-40363 is a high-severity vulnerability in Siemens SIMATIC PCS 7 V8.2, published on 9 Feb 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability has been identified in SIMATIC PCS 7 V8.2 (All versions), SIMATIC PCS 7 V9.0 (All versions), SIMATIC PCS 7 V9.1 (All versions < V9.1 SP1), SIMATIC WinCC V15 and earlier (All versions < V15 SP1 Update 7), SIMATIC WinCC V16 (All versions < V16 Update 5), SIMATIC WinCC V17 (All versions < V17 Update 2), SIMATIC WinCC V17 (All versions <= V17 Update 4), SIMATIC WinCC V7.4 (All versions < V7.4 SP1 Update 19), SIMATIC WinCC V7.5 (All versions < V7.5 SP2 Update 6). The affected component stores the credentials of a local system account in a potentially publicly accessible project file using an outdated cipher algorithm. An attacker may use this to brute force the credentials and take over the system.
Which versions are affected by CVE-2021-40363?
It affects 2 products.
Products include Siemens Simatic Pcs 7, Siemens Simatic Wincc.
How do I fix CVE-2021-40363?
No fix has been published for CVE-2021-40363 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-40363 being exploited?
There is no known exploitation of CVE-2021-40363 in the wild and no public exploit code.
Other vulnerabilities in Siemens SIMATIC PCS 7 V8.2
Sources
Also known as GHSA-wg4m-r562-77pw.