CVE-2017-7563 — In ARM Trusted Firmware 1.3, RO memory is always executable at AArch64 Secure EL1, allowing attackers to bypass the MT_EXECUTE_NEVER protection mechanism

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HIGH

In ARM Trusted Firmware 1.3, RO memory is always executable at AArch64 Secure EL1, allowing attackers to bypass the MT_EXECUTE_NEVER protection mechanism

Published Jun 7, 2017

8.1

HIGH

CVSS 3.1

EPSS 0.89%

Description

In ARM Trusted Firmware 1.3, RO memory is always executable at AArch64 Secure EL1, allowing attackers to bypass the MT_EXECUTE_NEVER protection mechanism. This issue occurs because of inconsistency in the number of execute-never bits (one bit versus two bits).

Affected products

Remediation

No remediation recorded yet.

Metrics

0.89% 0.00889

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

EPSS probability 0.00889

Score over time

2021–2026

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Percentile over time

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Table of values (9 key points)

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

Date	Score	Percentile	Model
Oct 1, 2026	0.89% (0.00889)	57.86th	v5 (v2026.06.15)
Sep 20, 2026	0.89% (0.00889)	57.77th	v5 (v2026.06.15)
Jul 20, 2024	0.22% (0.00217)	60.16th	v3 (v2023.03.01)
Jun 13, 2024	0.22% (0.00217)	59.88th	v3 (v2023.03.01)
Mar 7, 2023	0.22% (0.00217)	57.88th	v3 (v2023.03.01)
Mar 6, 2023	0.89% (0.00885)	27.89th	v2 (v2022.01.01)
Feb 4, 2022	0.89% (0.00885)	10.50th	v2 (v2022.01.01)
Feb 3, 2022	0.42% (0.00416)	10.04th	v5 (v2026.06.15)
Apr 14, 2021	0.42% (0.00416)	0.00th	v1