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CVE-2025-5820: Sony XAV-AX8500 Bluetooth ERTM Channel Authentication Bypass Vulnerability

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-06-21 · updated 2026-06-17
• Weakness: CWE-288

Description

Sony XAV-AX8500 Bluetooth ERTM Channel Authentication Bypass Vulnerability. This vulnerability allows network-adjacent attackers to bypass authentication on affected Sony XAV-AX8500 devices. Authentication is not required to exploit this vulnerability. The specific flaw exists within the implementation of Bluetooth ERTM channel communication. The issue results from improper channel data initialization. An attacker can leverage this vulnerability to bypass authentication on the system. Was ZDI-CAN-26285.

Affected products

• Sony XAV-AX8500: from 2.00.1 before 3.02.00 — fixed in 3.02.00

How to fix

Upgrade to a fixed version: Sony XAV-AX8500 3.02.00. Check the vendor advisory for mitigations.

References

• https://www.sony.com/electronics/support/mobile-cd-players-digital-media-players-xav-series/xav-ax8500/software/00344092
• https://www.zerodayinitiative.com/advisories/ZDI-25-358/

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