# CVE-2020-8333: Code injection in BIOS

> A vulnerability in the Lenovo BIOS EEPROM driver allows arbitrary code execution via a malicious SMI callback.

- **Severity:** Medium 6.4 (`CVSS:3.1/AV:L/AC:H/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:** 24 Sep 2020
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-2vg7-q8hg-5f79

## What is CVE-2020-8333?

CVE-2020-8333 is a medium-severity code injection vulnerability in Lenovo BIOS, published on 24 Sep 2020. 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 EEPROM driver in some Lenovo Desktops and ThinkStation models may allow arbitrary code execution

## Which versions are affected by CVE-2020-8333?

It affects 27 products.


Products: Lenovo 63 Firmware, Lenovo H50-30g Firmware, Lenovo M4500 Firmware, Lenovo M4550 Firmware, Lenovo Qitian 4500 Firmware, Lenovo Qitian B4550 Firmware, Lenovo Qitian M4550 Firmware, Lenovo Thinkcentre E73 Firmware, Lenovo Thinkcentre E73s Firmware, Lenovo Thinkcentre E93 Firmware, Lenovo Thinkcentre M4500k Firmware, Lenovo Thinkcentre M4500q Firmware, Lenovo Thinkcentre M4500s Firmware, Lenovo Thinkcentre M4500t Firmware, Lenovo Thinkcentre M9350z Firmware, Lenovo Thinkcentre M93z Firmware, Lenovo Thinkstation C30 Firmware, Lenovo Thinkstation D30 Firmware, Lenovo Thinkstation E32 Firmware, Lenovo Thinkstation P300 Firmware and 7 more.

## How do I fix CVE-2020-8333?

No fix has been published for CVE-2020-8333 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-8333 being exploited?

There is no known exploitation of CVE-2020-8333 in the wild and no public exploit code.

## Other vulnerabilities in Lenovo BIOS

- [CVE-2017-3753](https://insights.sbomify.com/CVE-2017-3753/): Security feature bypass in Desktop and Notebook BIOS (medium 6.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-8333 and fix it if it is affected.

What it is: CVE-2020-8333 is a medium-severity code injection vulnerability in Lenovo BIOS, published on 24 Sep 2020. 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-2020-8333 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-2020-8333/ (Markdown: https://insights.sbomify.com/CVE-2020-8333/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-8333
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-8333
- OSV: https://osv.dev/vulnerability/CVE-2020-8333

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-8333/
Summaries are generated and may contain mistakes; the official description above is the record.