Security Advisory: Multiple Vulnerabilities in TP-Link RE305 and Archer C7 (CVE-2026-18330, CVE-2026-102812, CVE-2026-102813, CVE-2026-102814, CVE-2026-102815 & CVE-2026-102816)

Description of Vulnerabilities and Impacts:

TP-Link has identified six vulnerabilities affecting cryptographic key management, configuration backup encryption, password recovery, diagnostic services, and wireless regulatory configuration in TP-Link RE305 v3 and Archer C7 v5 products.

CVE-2026-18330: Hardcoded Shared RSA-1024 Private Key in Web Login

A hard-coded cryptographic key vulnerability exists in TP-Link RE305 V3 and Archer C7 V5. The same RSA-1024 private key is stored within firmware configuration files and reused across devices. An attacker who obtains the private key and captures an HTTP Web UI login session may use the key to decrypt the administrator password.

Successful exploitation may disclose the administrator password captured from an HTTP login session and compromise session confidentiality.

CVSS v4.0 Score: 6.1/ Medium

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

CVE-2026-102812: Hardcoded AES-128 Key and Fixed IV in Configuration Backup Encryption

A hard-coded cryptographic key vulnerability exists in the user-configuration backup mechanism of TP-Link RE305 V3 and Archer C7 V5. A fixed AES-128 key and initialization vector are embedded in the firmware configuration-management component. An attacker who obtains an affected configuration backup file may extract the cryptographic material from the firmware and use it to decrypt the backup.

Successful exploitation may disclose sensitive configuration information contained in a backup file, including administrator passwords and Wi-Fi credentials.

CVSS v4.0 Score: 6.9/ Medium

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

CVE-2026-102813: Administrator Password Reset Through the Verification-Code Interface

An authentication flaw exists in the password-recovery functionality of TP-Link RE305 V3. The verification-code interface allows an unauthenticated attacker on the same local network to trigger generation of an administrator password-reset verification code. Because the interface lacks an effective attempt counter or lockout mechanism and uses a predictable verification-code generation process, an attacker may obtain or brute-force the code and reset the administrator password.

Successful exploitation may allow an unauthenticated attacker on the local network to reset the administrator password and subsequently access privileged device-management functions.

CVSS v4.0 Score: 6.1/ Medium

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

CVE-2026-102814: Improper Authentication in TP-Link TDDP v2 Allows Root Command Execution

An authentication weakness exists in the TP-Link TDDP v2 service of TP-Link RE305 V3. TDDP v2 uses a fixed and derivable cryptographic key, which may allow an unauthenticated attacker on the same local network to forge protocol packets and access privileged TDDP operations, including functionality that can lead to operating-system command execution when the TDDP service is running and accessible.

Successful exploitation may allow an unauthenticated attacker on the same local area network to execute arbitrary system commands with root privileges.

CVSS v4.0 Score: 8.7/ High

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

CVE-2026-102815: Command Injection in tmpServer Allows Local Privilege Escalation

An operating-system command injection vulnerability exists in the tmpServer service of TP-Link RE305 V3. The service runs with root privileges and listens on the local loopback interface. A local attacker with access to a low-privileged process on the device may submit a crafted request to the TDDPv1 service and execute operating-system commands with root privileges.

Successful exploitation may allow a local attacker with low privileges to obtain root privileges and execute arbitrary operating-system commands on the affected device.

CVSS v4.0 Score: 6.9/ Medium

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

CVE-2026-102816: Command Injection in tmpServer Allows Local Privilege Escalation

An operating-system command injection vulnerability exists in the tmpServer service of TP-Link RE305 V3. The service runs with root privileges and listens on the local loopback interface. A local attacker with access to a low-privileged process on the device may submit a crafted request to the TDDPv1 service and execute operating-system commands with root privileges.

Successful exploitation may allow a local attacker with low privileges to obtain root privileges and execute arbitrary operating-system commands on the affected device.

CVSS v4.0 Score: 6.9/ Medium

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

CVE-2026-102816: Unauthenticated Wireless Regulatory Region Configuration

An authorization vulnerability exists in the country or region configuration interface of TP-Link RE305 V3. An unauthenticated attacker on the same local network may modify the wireless regulatory region and force the device to reapply its wireless configuration.

Successful exploitation may cause wireless connection interruptions, unavailable channels, client disconnections, or wireless service instability, and may cause the device to apply parameters intended for a different regulatory region.

CVSS v4.0 Score: 5.3/ Medium

CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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. Follow the instructions to update to the latest firmware version to fix the vulnerabilities:

US: Download for RE305 | TP-Link

Download for Archer C7 | TP-Link

EN: Download for RE305 | TP-Link

Download for Archer C7 | TP-Link

Disclaimer:

This advisory is provided for informational purposes only and is subject to change without notice. The information is provided “as is” without warranties of any kind. TP-Link recommends that customers promptly apply available firmware updates or implement documented workarounds as provided in this advisory. Devices/systems that are not updated or mitigated as described may remain vulnerable, and TP-Link disclaims any responsibility or liability for any damages or losses arising from a failure to implement such updates.