CVE-2021-33627 Memory corruption in n/a
Insufficient validation in InsydeH2O BIOS allows attackers to access protected memory regions, potentially leading to privilege escalation or code execution.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-33627?
CVE-2021-33627 is a high-severity memory corruption vulnerability in Insyde Insydeh2o, published on 3 Feb 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An issue was discovered in Insyde InsydeH2O Kernel 5.0 before 05.09.11, 5.1 before 05.17.11, 5.2 before 05.27.11, 5.3 before 05.36.11, 5.4 before 05.44.11, and 5.5 before 05.52.11 affecting FwBlockServiceSmm. Software SMI services that use the Communicate() function of the EFI_SMM_COMMUNICATION_PROTOCOL do not check whether the address of the buffer is valid, which allows use of SMRAM, MMIO, or OS kernel addresses.
Weakness: CWE-119
Which versions are affected by CVE-2021-33627?
It affects 15 products.
Products include Insyde Insydeh2o, Siemens Simatic Field Pg M5 Firmware, Siemens Simatic Field Pg M6 Firmware, Siemens Simatic Ipc127e Firmware, Siemens Simatic Ipc227g Firmware, Siemens Simatic Ipc277g Firmware and 9 more.
How do I fix CVE-2021-33627?
No fix has been published for CVE-2021-33627 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-33627 being exploited?
There is no known exploitation of CVE-2021-33627 in the wild and no public exploit code.
Other vulnerabilities in Insyde Insydeh2o
Sources
Also known as GHSA-g6pg-5762-5mq6.