CVE-2025-2955 Overview
CVE-2025-2955 is an improper access control vulnerability in the TOTOLINK A3000RU wireless router firmware up to version 5.9c.5185. The flaw resides in the /cgi-bin/ExportIbmsConfig.sh endpoint of the IBMS Configuration File Handler component. Remote attackers can reach this endpoint over the network without authentication and trigger the vulnerable functionality. The public disclosure of the exploit increases the likelihood of opportunistic scanning against exposed devices. The weakness maps to CWE-266: Incorrect Privilege Assignment.
Critical Impact
Unauthenticated remote attackers can access the IBMS configuration export endpoint on affected TOTOLINK A3000RU routers, exposing device configuration data.
Affected Products
- TOTOLINK A3000RU router (hardware)
- TOTOLINK A3000RU firmware versions up to and including 5.9c.5185
- Deployments exposing the router web interface to untrusted networks
Discovery Timeline
- 2025-03-30 - CVE-2025-2955 published to the National Vulnerability Database
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-2955
Vulnerability Analysis
The vulnerability affects the CGI script /cgi-bin/ExportIbmsConfig.sh, which is part of the router's IBMS Configuration File Handler. The script fails to enforce access controls on incoming HTTP requests. As a result, an unauthenticated remote client can invoke the endpoint and interact with configuration-export functionality intended for privileged administrative use.
Exposure of router configuration data can reveal network topology, service credentials, and administrative settings. Attackers can chain this information disclosure with other weaknesses to pivot deeper into the target environment. The exploit has been publicly disclosed through third-party vulnerability databases, lowering the technical barrier for attackers.
Root Cause
The root cause is missing or insufficient authorization enforcement in the ExportIbmsConfig.sh CGI handler. The endpoint does not validate whether the caller holds an authenticated administrative session before performing its action. This is a classic broken access control condition on an embedded management interface.
Attack Vector
Exploitation requires network reachability to the router's HTTP management interface. No credentials, user interaction, or elevated privileges are required. An attacker sends a crafted HTTP request to /cgi-bin/ExportIbmsConfig.sh on the target device to trigger the vulnerable path. Devices with the management interface exposed to the internet or to untrusted LAN segments face the highest risk.
No verified proof-of-concept code has been published in a vendor or research advisory. Technical details are available in the Notion security report and the VulDB entry #302008.
Detection Methods for CVE-2025-2955
Indicators of Compromise
- Unexpected HTTP GET or POST requests to /cgi-bin/ExportIbmsConfig.sh from external or unauthorized internal sources.
- Outbound transfers of configuration-sized responses originating from the router's management interface.
- Router administrative sessions or logs showing configuration export events without a corresponding authenticated admin action.
Detection Strategies
- Inspect network traffic for requests targeting the ExportIbmsConfig.sh path on TOTOLINK A3000RU management ports.
- Correlate router access logs with authentication events to identify unauthenticated calls to CGI endpoints.
- Deploy IDS/IPS signatures matching HTTP requests to /cgi-bin/ExportIbmsConfig.sh and alert on any hits from non-management subnets.
Monitoring Recommendations
- Continuously monitor the exposure of router management interfaces using external attack surface tooling.
- Baseline expected administrative traffic to the router and alert on deviations, including new source IPs and unusual request paths.
- Forward router syslog and web-access logs to a centralized SIEM for retention and correlation with broader network activity.
How to Mitigate CVE-2025-2955
Immediate Actions Required
- Restrict access to the router's HTTP management interface so it is not reachable from the internet or untrusted networks.
- Place TOTOLINK A3000RU devices behind a firewall ACL that only permits management traffic from designated administrative hosts.
- Rotate any credentials, keys, or secrets that may have been present in exported IBMS configuration data.
- Audit router logs for prior requests to /cgi-bin/ExportIbmsConfig.sh and treat matches as potential compromise.
Patch Information
At the time of the last NVD update on 2026-06-17, no vendor advisory or firmware fix has been referenced for CVE-2025-2955. Administrators should monitor the TOTOLINK official site for firmware updates addressing the A3000RU IBMS configuration handler. Until a patched firmware version is released, apply the network-level workarounds below.
Workarounds
- Disable remote (WAN-side) management on the router and require administration only from a trusted management VLAN.
- Segment the router management network from user and guest networks to limit lateral exposure.
- Consider replacing the device if it is deployed in a sensitive environment and remains unpatched after an extended period.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
