CVE-2014-4860 — Multiple integer overflows in the Pre-EFI Initialization (PEI) boot phase in the Capsule Update feature in the UEFI implementation in EDK2 allow physically proximate attackers to bypass intended access restrictions by providing crafted data that is not properly handled during the coalescing phase

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MEDIUM

Multiple integer overflows in the Pre-EFI Initialization (PEI) boot phase in the Capsule Update feature in the UEFI implementation in EDK2 allow physically proximate attackers to bypass intended access restrictions by providing crafted data that is not properly handled during the coalescing phase

Published Jan 31, 2020

6.8

MEDIUM

CVSS 3.1

EPSS 0.50%

Description

Multiple integer overflows in the Pre-EFI Initialization (PEI) boot phase in the Capsule Update feature in the UEFI implementation in EDK2 allow physically proximate attackers to bypass intended access restrictions by providing crafted data that is not properly handled during the coalescing phase.

Affected products

Vendor American Megatrends Incorporated (AMI) Product BIOS Default
n/a
- Version
  unknown
  Status
  affected
  Constraints
  -
Vendor Phoenix Technologies Ltd. Product SCT3 Default
n/a
- Version
  before 5/23/2014
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

American Megatrends Incorporated (AMI)

BIOS

n/a

Version	Status	Constraints
unknown	affected	-

Phoenix Technologies Ltd.

SCT3

n/a

Version	Status	Constraints
before 5/23/2014	affected	-

Remediation

No remediation recorded yet.

Metrics

0.50% 0.00504

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.00504

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (10 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	0.50% (0.00504)	40.87th	v5 (v2026.06.15)
Jun 15, 2026	0.50% (0.00504)	38.91th	v5 (v2026.06.15)
Mar 17, 2025	0.03% (0.00033)	6.29th	v4 (v2025.03.14)
Dec 12, 2024	0.07% (0.00066)	31.22th	v3 (v2023.03.01)
Jun 10, 2024	0.07% (0.00066)	29.02th	v3 (v2023.03.01)
Mar 7, 2023	0.07% (0.00066)	27.02th	v3 (v2023.03.01)
Mar 6, 2023	0.89% (0.00885)	27.89th	v2 (v2022.01.01)
Sep 10, 2022	0.89% (0.00885)	26.24th	v2 (v2022.01.01)
Apr 1, 2022	0.89% (0.00885)	24.24th	v2 (v2022.01.01)
Feb 4, 2022	0.89% (0.00885)	10.50th	v2 (v2022.01.01)

Weaknesses (1)

CWE-190

Integer Overflow

References (1)

http://www.kb.cert.org/vuls/id/552286
x_refsource_MISCThird Party AdvisoryUS Government Resource

Link	Providers	Tags
http://www.kb.cert.org/vuls/id/552286		x_refsource_MISCThird Party AdvisoryUS Government Resource

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner certcc

Published Jan 31, 2020

Updated Aug 6, 2024

Reserved Jul 10, 2014

Link CVE-2014-4860

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 17, 2026

Link CVE-2014-4860

Red Hat

Severity n/a

Public date n/a

Links CVE-2014-4860