# CVE-2021-4211: Code injection in BIOS

> Local attackers with elevated privileges can execute arbitrary code via a vulnerability in the Lenovo BIOS SMBIOS event log driver.

- **Severity:** Medium 6.7 (`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 22 Apr 2022
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-rxqj-f9pj-x22r

## What is CVE-2021-4211?

CVE-2021-4211 is a medium-severity code injection vulnerability in Lenovo 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 the SMI callback function used in the SMBIOS event log driver in some Lenovo Desktop, ThinkStation, and ThinkEdge models may allow an attacker with local access and elevated privileges to execute arbitrary code.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2021-4211?

It affects 53 products.


Products: Lenovo A340-22icb Firmware, Lenovo A340-22ick Firmware, Lenovo A340-24icb Firmware, Lenovo A340-24ick Firmware, Lenovo A540-24icb Firmware, Lenovo A540-27icb Firmware, Lenovo Ideacentre 5-14iob6 Firmware, Lenovo Ideacentre 510s-07icb Firmware, Lenovo Ideacentre 510s-07ick Firmware, Lenovo Ideacentre Aio 3-22ada6 Firmware, Lenovo Ideacentre Aio 3-22iil5 Firmware, Lenovo Ideacentre Aio 3-22itl6 Firmware, Lenovo Ideacentre Aio 3-24ada6 Firmware, Lenovo Ideacentre Aio 3-24iil5 Firmware, Lenovo Ideacentre Aio 3-24itl6 Firmware, Lenovo Ideacentre Aio 3-27itl6 Firmware, Lenovo Ideacentre Creator 5-14iob6 Firmware, Lenovo Ideacentre Gaming 5-14iob6 Firmware, Lenovo Se30 Firmware, Lenovo Thinkcentre M600 Firmware and 33 more.

## How do I fix CVE-2021-4211?

No fix has been published for CVE-2021-4211 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-4211 being exploited?

There is no known exploitation of CVE-2021-4211 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-4211 and fix it if it is affected.

What it is: CVE-2021-4211 is a medium-severity code injection vulnerability in Lenovo BIOS, published on 22 Apr 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-4211 in the wild and no public exploit code.

Affected product: Lenovo BIOS. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2021-4211/ (Markdown: https://insights.sbomify.com/CVE-2021-4211/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-4211
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-4211
- OSV: https://osv.dev/vulnerability/CVE-2021-4211

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-4211/
Summaries are generated and may contain mistakes; the official description above is the record.