CVE-2021-33834 Memory corruption in n/a
A local attacker can exploit a memory corruption vulnerability in the Insyde H2OFFT driver to execute arbitrary code or crash 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-2021-33834?
CVE-2021-33834 is a high-severity memory corruption vulnerability in n/a, published on 8 Sep 2023. 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 iscflashx64.sys 3.9.3.0 in Insyde H2OFFT 6.20.00. When handling IOCTL 0x22229a, the input used to allocate a buffer and copy memory is mishandled. This could cause memory corruption or a system crash.
Weakness: CWE-787
Which versions are affected by CVE-2021-33834?
It affects 2 products.
Products include Insyde H2offt, Insyde Iscflashx64.sys.
How do I fix CVE-2021-33834?
No fix has been published for CVE-2021-33834 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-2021-33834 being exploited?
There is no known exploitation of CVE-2021-33834 in the wild and no public exploit code.
Sources
Also known as GHSA-2q86-2ww4-wc89.