CVE-2021-45971 Memory corruption in n/a
Insufficient validation of buffer pointers in the SMM handler allows attackers to trigger memory corruption, potentially leading to code execution or privilege escalation.
- 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-2021-45971?
CVE-2021-45971 is a high-severity memory corruption vulnerability in Insyde Insydeh2o, published on 5 Jan 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 SdHostDriver in Insyde InsydeH2O with kernel 5.1 before 05.16.25, 5.2 before 05.26.25, 5.3 before 05.35.25, 5.4 before 05.43.25, and 5.5 before 05.51.25. A vulnerability exists in the SMM (System Management Mode) branch that registers a SWSMI handler that does not sufficiently check or validate the allocated buffer pointer (CommBufferData).
Weakness: CWE-787
Which versions are affected by CVE-2021-45971?
It affects 1 product.
Products include Insyde Insydeh2o.
How do I fix CVE-2021-45971?
No fix has been published for CVE-2021-45971 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-2021-45971 being exploited?
There is no known exploitation of CVE-2021-45971 in the wild and no public exploit code.
Other vulnerabilities in Insyde Insydeh2o
Sources
Also known as GHSA-3fxw-xghg-85m2.