What is the CVSS score of CVE-2025-5477?

CVE-2025-5477 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

How to fix or mitigate CVE-2025-5477?

Within 24 hours: Inventory all Sony XAV-AX8500 devices in use and assess deployment locations. Within 7 days: Apply vendor patch to all affected devices prioritizing vehicles in active use; disable Bluetooth pairing with untrusted devices where feasible. Within 30 days: Complete patching of all systems and conduct post-patch validation testing.

Xav Ax8500 Firmware CVE-2025-5477

EUVD-2025-18884 HIGH

Heap-based Buffer Overflow (CWE-122)

2025-06-21 zdi-disclosures@trendmicro.com

RCE Buffer Overflow Xav Ax8500 Firmware Sony

7.5

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-122 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Heap buffer bounds checking MITRE ATT&CK 1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS 7.5. EPSS 0.1%. Vendor patch available.
Exploit ScenarioDerived	An attacker could exploit this vulnerability in the affected application to compromise the security of affected deployments, potentially impacting confidentiality, integrity, or availability.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 15, 2026

A remote code execution vulnerability (CVSS 7.5) that allows network-adjacent attackers. High severity vulnerability requiring prompt remediation. Vendor patch is available.

Earlier versions of this analysis (1)

v1 Mar 15, 2026 - 21:35 CVSS 7.5

RemediationAI

Apply the vendor-supplied patch immediately. Consider network segmentation to limit exposure if patching is delayed.

Affected VersionsENISA

XAV-AX8500 2.00.01

Affected Packages

euvd xav_ax8500 no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

CWE-122 (Heap-based Buffer Overflow). CVSS 7.5 indicates high severity.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.5 HIGH

AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Adjacent

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Patch released

Mar 15, 2026 - 21:35 nvd

Patch available

CVE Published

Jun 21, 2025 - 01:15 nvd

HIGH 7.5

DescriptionCVE.org

Sony XAV-AX8500 Bluetooth L2CAP Protocol Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected Sony XAV-AX8500 devices. An attacker must first obtain the ability to pair a malicious Bluetooth device with the target system in order to exploit this vulnerability.

The specific flaw exists within the implementation of the Bluetooth L2CAP protocol. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the elysian-bt-service process. Was ZDI-CAN-26286.

Executive ViewAI

Why It Matters

A high-severity vulnerability in Sony XAV-AX8500 in-vehicle infotainment systems could allow attackers to execute arbitrary code remotely through a paired Bluetooth device. Organizations operating vehicle fleets or managing these systems should prioritize patching to prevent potential vehicle control compromise and data exposure.

Business Impact: High

Compensating Controls

Apply vendor patch. If immediate patching is not possible: restrict Bluetooth pairing to pre-authorized devices only; disable Bluetooth connectivity when not in use; monitor and restrict physical access to vehicle infotainment systems; implement network segmentation to isolate affected devices from critical vehicle control systems.

Threat Intelligence Overview

EPSS Score

0.1%

Top 78% exploitable

Data Quality

4 sources

Confidence: Medium

EUVD

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.1%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Controlled

Automatable· derived

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +38

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Remote Code Execution CRITICAL

Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.