CVE-2021-21574 Memory corruption in BIOSConnect
An authenticated local admin can exploit a buffer overflow in Dell BIOSConnect to execute arbitrary code and bypass UEFI security restrictions.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-21574?
CVE-2021-21574 is a high-severity memory corruption vulnerability in Dell Chengming 3990 Firmware, published on 24 Jun 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Dell BIOSConnect feature contains a buffer overflow vulnerability. An authenticated malicious admin user with local access to the system may potentially exploit this vulnerability to run arbitrary code and bypass UEFI restrictions.
Which versions are affected by CVE-2021-21574?
It affects 128 products.
Products include Dell Alienware M15 R6 Firmware, Dell Chengming 3990 Firmware, Dell Chengming 3991 Firmware, Dell G15 5510 Firmware, Dell G15 5511 Firmware, Dell G3 3500 Firmware and 122 more.
How do I fix CVE-2021-21574?
No fix has been published for CVE-2021-21574 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-2021-21574 being exploited?
There is no known exploitation of CVE-2021-21574 in the wild and no public exploit code.
Other vulnerabilities in Dell Chengming 3990 Firmware
Sources
Also known as GHSA-666g-rqqj-3462.