# CVE-2021-3719: Code injection in ThinkCentre and ThinkStation BIOS

> Local attackers with elevated privileges can execute arbitrary code via a vulnerability in the BIOS SMI callback function during sleep state resumption.

- **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:** 12 Nov 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-rrvf-m2c7-c86r

## What is CVE-2021-3719?

CVE-2021-3719 is a medium-severity code injection vulnerability in Lenovo ThinkCentre and ThinkStation BIOS, published on 12 Nov 2021. 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 that saves and restore boot script tables used for resuming from sleep state in some ThinkCentre and ThinkStation 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-2021-3719?

It affects 20 products.


Products: Lenovo Thinkcentre E93 Firmware, Lenovo Thinkcentre M4500q Firmware, Lenovo Thinkcentre M600 Firmware, Lenovo Thinkcentre M6500t\/S Firmware, Lenovo Thinkcentre M700 Tiny Firmware, Lenovo Thinkcentre M73 Firmware, Lenovo Thinkcentre M73p Firmware, Lenovo Thinkcentre M800 Firmware, Lenovo Thinkcentre M818z Firmware, Lenovo Thinkcentre M83 Firmware, Lenovo Thinkcentre M8500t\/S Firmware, Lenovo Thinkcentre M900 Firmware, Lenovo Thinkcentre M900x Firmware, Lenovo Thinkcentre M93 Firmware, Lenovo Thinkcentre M93p Firmware, Lenovo Thinkcentre X1 Firmware, Lenovo Thinkstation P300 Firmware, Lenovo Thinkstation P500 Firmware, Lenovo Thinkstation P700 Firmware, Lenovo Thinkstation P900 Firmware.

## How do I fix CVE-2021-3719?

No fix has been published for CVE-2021-3719 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-3719 being exploited?

There is no known exploitation of CVE-2021-3719 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-3719 and fix it if it is affected.

What it is: CVE-2021-3719 is a medium-severity code injection vulnerability in Lenovo ThinkCentre and ThinkStation BIOS, published on 12 Nov 2021. 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-2021-3719 in the wild and no public exploit code.

Affected product: Lenovo ThinkCentre and ThinkStation 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-2021-3719/ (Markdown: https://insights.sbomify.com/CVE-2021-3719/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-3719
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-3719
- OSV: https://osv.dev/vulnerability/CVE-2021-3719

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-3719/
Summaries are generated and may contain mistakes; the official description above is the record.