---
title: "CVE-2014-4859\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2014-4859?format=md
keywords: index, follow
---

# CVE-2014-4859

Publication date 31 January 2020

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**6.8 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2014-4859?format=md#impact-score)

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## 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.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2014-4859?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| edk2 | 15.04 vivid | Not affected |
| 14.04 LTS trusty | Not in release |
| 12.04 LTS precise | Not in release |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Notes

---

### [sbeattie](https://launchpad.net/~sbeattie)

No support for updates of hypervisor-supplied firmware from
guests

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

6.8 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Physical |
  | Attack complexity | Low |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | High |
  | Integrity impact | High |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 6.8 · Medium |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-4859)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2014-4859)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2014-4859)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2014-4859)

### Other references

* <https://www.mitre.org/sites/default/files/publications/14-2221-extreme-escalation-presentation.pdf>
* <https://www.cve.org/CVERecord?id=CVE-2014-4859>