CVE-2021-3970 Code injection in Notebook BIOS
Local attackers with elevated privileges can execute arbitrary code via insufficient validation in Lenovo Notebook BIOS SMI handlers.
- 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-2021-3970?
CVE-2021-3970 is a medium-severity code injection vulnerability in Lenovo Notebook BIOS, published on 22 Apr 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A potential vulnerability in LenovoVariable SMI Handler due to insufficient validation in some Lenovo Notebook models BIOS may allow an attacker with local access and elevated privileges to execute arbitrary code.
Weakness: CWE-20
Which versions are affected by CVE-2021-3970?
It affects 105 products.
Products include Lenovo Ideapad 3-14ada05 Firmware, Lenovo Ideapad 3-14ada6 Firmware, Lenovo Ideapad 3-14alc6 Firmware, Lenovo Ideapad 3-14are05 Firmware, Lenovo Ideapad 3-14igl05 Firmware, Lenovo Ideapad 3-14iil05 Firmware and 99 more.
How do I fix CVE-2021-3970?
No fix has been published for CVE-2021-3970 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2021-3970 being exploited?
There is no known exploitation of CVE-2021-3970 in the wild and no public exploit code.
Other vulnerabilities in Lenovo Notebook BIOS
Sources
Also known as GHSA-2g3v-5cpr-rx7q.