CVE-2025-67158: Revotech I6032W-FHW Auth Bypass Flaw

CVE-2025-67158 Overview

CVE-2025-67158 is an authentication bypass vulnerability affecting the /cgi-bin/jvsweb.cgi endpoint in Revotech I6032W-FHW firmware version v1.0.0014 - 20210517. This vulnerability allows unauthenticated attackers to access sensitive information and potentially escalate privileges by sending crafted HTTP requests to the vulnerable endpoint.

The flaw is classified under CWE-287 (Improper Authentication), indicating that the affected CGI script fails to properly verify user credentials before granting access to protected resources. This type of vulnerability in network-connected IoT devices like IP cameras poses significant security risks, as attackers can remotely exploit the weakness without any authentication.

Critical Impact
Unauthenticated remote attackers can bypass authentication to access sensitive device information and escalate privileges on affected Revotech I6032W-FHW devices via network-based attacks.

Affected Products

Revotech I6032W-FHW v1.0.0014 - 20210517
Revotech I6032W-FHW devices with firmware dated 20210517 or earlier
Network-accessible Revotech devices with exposed /cgi-bin/jvsweb.cgi endpoint

Discovery Timeline

2026-01-02 - CVE-2025-67158 published to NVD
2026-01-08 - Last updated in NVD database

Technical Details for CVE-2025-67158

Vulnerability Analysis

The vulnerability resides in the /cgi-bin/jvsweb.cgi endpoint of Revotech I6032W-FHW devices. This CGI script is intended to handle web-based management functions but fails to implement proper authentication checks. As a result, attackers can craft malicious HTTP requests that bypass the authentication mechanism entirely.

The network-based attack vector requires no authentication or user interaction, making it particularly dangerous for internet-exposed devices. Successful exploitation grants attackers access to sensitive device information, which could include configuration details, credentials, or other data that facilitates further attacks.

Root Cause

The root cause of this vulnerability is improper authentication (CWE-287) in the CGI script implementation. The /cgi-bin/jvsweb.cgi endpoint does not adequately validate that incoming requests originate from authenticated sessions before processing them. This allows attackers to directly access functionality and data that should require valid credentials.

This is a common vulnerability pattern in embedded device firmware, where CGI scripts may assume that front-end web interfaces will enforce authentication, leaving backend endpoints unprotected when accessed directly.

Attack Vector

The attack is conducted remotely over the network by sending specially crafted HTTP requests directly to the vulnerable CGI endpoint. The exploitation process typically involves:

An attacker identifies an exposed Revotech I6032W-FHW device on the network
The attacker sends crafted HTTP requests to /cgi-bin/jvsweb.cgi
The endpoint processes the request without validating authentication
Sensitive information is returned to the attacker, or privileged actions are executed

The vulnerability is accessible without any prior authentication, making reconnaissance and exploitation straightforward for attackers who can reach the device over the network.

Technical details and proof-of-concept information are available in the GitHub CVE-2025-67158 PoC Repository.

Detection Methods for CVE-2025-67158

Indicators of Compromise

Unusual HTTP requests to /cgi-bin/jvsweb.cgi from external or unauthorized IP addresses
Unexpected access patterns to device management interfaces without corresponding login events
Network traffic anomalies indicating automated scanning or exploitation attempts against CGI endpoints
Log entries showing successful responses to unauthenticated requests to protected endpoints

Detection Strategies

Deploy network intrusion detection rules to alert on suspicious requests to /cgi-bin/jvsweb.cgi endpoints
Implement web application firewall (WAF) rules to filter and monitor requests to CGI scripts on embedded devices
Monitor for reconnaissance activity targeting Revotech devices, including port scanning and service enumeration
Review access logs for patterns consistent with authentication bypass exploitation attempts

Monitoring Recommendations

Enable verbose logging on network devices and firewalls monitoring traffic to IoT/embedded devices
Set up alerts for any external access attempts to device management interfaces
Regularly audit which devices are exposed to the internet and ensure proper network segmentation
Implement SIEM correlation rules to detect multiple failed authentication attempts followed by successful unauthenticated access

How to Mitigate CVE-2025-67158

Immediate Actions Required

Isolate affected Revotech I6032W-FHW devices from untrusted networks immediately
Place vulnerable devices behind a firewall with strict access controls limiting access to trusted IP addresses only
Disable remote access to device management interfaces if not operationally required
Conduct an inventory to identify all Revotech I6032W-FHW devices in your environment running affected firmware

Patch Information

At the time of this writing, no vendor patch has been confirmed as available. Organizations should monitor the Revotech Homepage for firmware updates addressing this vulnerability. Contact Revotech support directly to inquire about security patches for CVE-2025-67158.

Workarounds

Implement network segmentation to isolate affected devices from direct internet access and untrusted network segments
Use VPN or other secure remote access solutions if remote management is required
Deploy a reverse proxy or WAF in front of affected devices to filter malicious requests to /cgi-bin/jvsweb.cgi
Consider replacing end-of-life or unsupported devices with models that receive active security updates

bash

# Example firewall rule to restrict access to affected device
# Allow only trusted management subnet
iptables -A INPUT -p tcp --dport 80 -s 10.0.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -s 10.0.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP