CVE-2023-33921 Auth bypass in CP-8031 MASTER MODULE
An attacker with physical access can brute-force the root password via an exposed UART console to gain full control of Siemens master modules.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-33921?
CVE-2023-33921 is a medium-severity authentication bypass vulnerability in Siemens CP-8031 MASTER MODULE, published on 13 Jun 2023. 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 CP-8031 MASTER MODULE (All versions < CPCI85 V05), CP-8050 MASTER MODULE (All versions < CPCI85 V05). The affected devices contain an exposed UART console login interface. An attacker with direct physical access could try to bruteforce or crack the root password to login to the device.
Weakness: CWE-749
Which versions are affected by CVE-2023-33921?
It affects 1 product.
Products include Siemens Cpci85 Firmware.
How do I fix CVE-2023-33921?
No fix has been published for CVE-2023-33921 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-2023-33921 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-33921 exists.
Other vulnerabilities in Siemens CP-8031 MASTER MODULE
Sources
Also known as GHSA-hpw2-7w94-ff35.