# CVE-2014-4859: Integer overflow in BIOS

> Physically proximate attackers can bypass access restrictions in UEFI firmware via an integer overflow in the Capsule Update feature.

- **Severity:** Medium 6.8 (`CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 31 Jan 2020
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-hpff-53rm-95gf

## What is CVE-2014-4859?

CVE-2014-4859 is a medium-severity vulnerability in American Megatrends Incorporated (AMI) BIOS, published on 31 Jan 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Integer overflow in the Drive Execution Environment (DXE) phase in the Capsule Update feature in the UEFI implementation in EDK2 allows physically proximate attackers to bypass intended access restrictions via crafted data.

Weakness: CWE-190 (Integer Overflow or Wraparound)

## Which versions are affected by CVE-2014-4859?

It affects 1 product.


Products: Tianocore Edk2.

## How do I fix CVE-2014-4859?

No fix has been published for CVE-2014-4859 yet. Limit exposure of the affected software until one is available.

## Is CVE-2014-4859 being exploited?

There is no known exploitation of CVE-2014-4859 in the wild and no public exploit code.

## Other vulnerabilities in American Megatrends Incorporated (AMI) BIOS

- [CVE-2023-45230](https://insights.sbomify.com/CVE-2023-45230/): Buffer Overflow in EDK II Network Package (high 8.3)
- [CVE-2023-45234](https://insights.sbomify.com/CVE-2023-45234/): Buffer Overflow in EDK II Network Package (high 8.3)
- [CVE-2023-45235](https://insights.sbomify.com/CVE-2023-45235/): Buffer Overflow in EDK II Network Package (high 8.3)
- [CVE-2021-28210](https://insights.sbomify.com/CVE-2021-28210/): Denial of service in EDK II (high 7.8)
- [CVE-2019-14584](https://insights.sbomify.com/CVE-2019-14584/): Null dereference in Tianocore EDK2 (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2014-4859 and fix it if it is affected.

What it is: CVE-2014-4859 is a medium-severity vulnerability in American Megatrends Incorporated (AMI) BIOS, published on 31 Jan 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-2014-4859 in the wild and no public exploit code.

Affected product: American Megatrends Incorporated (AMI) 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-2014-4859/ (Markdown: https://insights.sbomify.com/CVE-2014-4859/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2014-4859
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2014-4859
- OSV: https://osv.dev/vulnerability/CVE-2014-4859

---
From sbomify Insights: https://insights.sbomify.com/CVE-2014-4859/
Summaries are generated and may contain mistakes; the official description above is the record.