Security Advisory on Multiple Vulnerabilities on TP-Link VX800v (CVE-2025-13399, CVE-2025-15541 to CVE-2025-15543, CVE-2025-15548)

Description of Vulnerabilities and Impacts:

The following vulnerabilities were identified on TP-Link VX800v v1.0:

CVE-2025-13399: Insecure Encryption in Communication with the Web Interface

A weakness in the web interface’s application layer encryption allows an adjacent attacker to brute force the weak AES key and decrypt intercepted traffic. Successful exploitation requires network proximity but no authentication, and may result in high impact to confidentiality, integrity, and availability of transmitted data.

CVSS v4.0 Score: 7.7 / High

CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVE-2025-15541: Access to System Files via SFTP

Improper link resolution in the VX800v SFTP service allows authenticated adjacent attackers to use crafted symbolic links to access system files, resulting in high confidentiality impact and limited integrity risk.

CVSS v4.0 Score: 6.9 / Medium

CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

CVE-2025-15542: Denial of Service (DoS) of VoIP Communication

Improper handling of exceptional conditions in SIP processing allows an attacker to flood the VX800v with crafted INVITE messages, blocking all voice lines and causing a denial of service on incoming calls.

CVSS v4.0 Score: 6.3 / Medium

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

CVE-2025-15543: Read-Only Root Access via USB Storage Device

Improper link resolution in USB HTTP access path allows a crafted USB device to expose root filesystem contents, giving an attacker with physical access read-only access to system files.

CVSS v4.0 Score: 5.1 / Medium

CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVE-2025-15548: Missing Application-Layer Encryption in Web Interface Endpoints

Some VX800v web interface endpoints transmit sensitive information over unencrypted HTTP due to missing application layer encryption, allowing a network adjacent attacker to intercept this traffic and compromise its confidentiality.

CVSS v4.0 Score: 5.3 / Medium

CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Affected Products/Versions and Fixes:

Recommendations:

We strongly recommend that users with affected devices take the following actions:

1. Download and update to the latest firmware version to fix the vulnerabilities.

DE: Download für VX800v | TP-Link Deutschland

This product is not sold in the US.

Disclaimer:

If you do not take all recommended actions, this vulnerability will remain. TP-Link cannot bear any responsibility for consequences that could have been avoided by following this advisory.