CVE-2014-4859

Publication date 31 January 2020

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

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

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

Notes

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