CVE-2025-7417 Overview
CVE-2025-7417 is a stack-based buffer overflow vulnerability in the Tenda O3V2 wireless bridge running firmware version 1.0.0.12(3880). The flaw resides in the fromNetToolGet function within /goform/setPingInfo, served by the device httpd component. An attacker who manipulates the ip argument can corrupt the stack and influence program execution. The issue is remotely reachable over the network and requires only low-level privileges. Public disclosure includes proof-of-concept material referenced by VulDB and a GitHub write-up. The vulnerability is categorized under [CWE-119] (Improper Restriction of Operations within the Bounds of a Memory Buffer).
Critical Impact
Remote attackers with low privileges can overflow the stack in the httpd process, enabling potential code execution or denial of service on affected Tenda O3V2 devices.
Affected Products
- Tenda O3 hardware revision 2.0
- Tenda O3 firmware version 1.0.0.12(3880)
- httpd component handling /goform/setPingInfo
Discovery Timeline
- 2025-07-10 - CVE-2025-7417 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-7417
Vulnerability Analysis
The vulnerability lives in the fromNetToolGet handler invoked when a client posts to /goform/setPingInfo on the device web interface. The handler reads the ip parameter from the HTTP request and copies it into a fixed-size stack buffer without enforcing length checks. Supplying an oversized ip value overflows the buffer and overwrites adjacent stack data, including saved registers and the return address.
The attack is network-reachable against the management interface of the O3V2 bridge. Successful exploitation can crash the httpd daemon and disrupt device availability. On embedded MIPS or ARM targets typical of Tenda devices, attackers commonly chain such overflows with return-oriented programming to achieve arbitrary code execution as the httpd process, which often runs with root privileges.
Root Cause
The root cause is missing bounds validation on the ip argument before it is copied into a stack-allocated buffer inside fromNetToolGet. Standard unsafe string operations such as strcpy or sprintf permit copy lengths that exceed the destination buffer size, classifying the flaw as [CWE-119].
Attack Vector
An attacker sends a crafted HTTP request to /goform/setPingInfo containing an overlong ip parameter. The request requires authenticated access to the web management interface, but no user interaction. Once the overflow occurs, the attacker controls saved return state in the httpd process and can redirect execution. Refer to the GitHub Vulnerability Documentation and the GitHub PoC for Vulnerability for technical details of the request structure.
Detection Methods for CVE-2025-7417
Indicators of Compromise
- Unexpected restarts or crashes of the httpd process on Tenda O3V2 devices.
- HTTP POST requests to /goform/setPingInfo containing abnormally long ip parameter values.
- Inbound connections to the device management interface from untrusted networks or unknown source addresses.
- New or unexpected outbound connections originating from the device after web interface activity.
Detection Strategies
- Inspect web access logs for /goform/setPingInfo requests and flag ip values exceeding typical IPv4 string length.
- Deploy network IDS signatures matching oversized ip parameter content in HTTP POST bodies targeting Tenda management endpoints.
- Correlate device reboots and httpd restart events against preceding HTTP traffic to the management interface.
Monitoring Recommendations
- Forward device syslog and HTTP traffic metadata to a centralized log platform for retention and search.
- Alert on any administrative authentication to Tenda O3V2 devices from outside expected management ranges.
- Track firmware version and configuration drift across all deployed O3V2 units to confirm patch status.
How to Mitigate CVE-2025-7417
Immediate Actions Required
- Restrict access to the device web management interface to trusted administrative VLANs or jump hosts only.
- Disable remote WAN-side management on all Tenda O3V2 devices.
- Rotate management credentials and enforce strong passwords to limit low-privileged attacker access.
- Audit deployed firmware versions and identify all units running 1.0.0.12(3880).
Patch Information
At the time of NVD publication, no vendor advisory or fixed firmware version is listed for CVE-2025-7417. Monitor the Tenda Official Website for firmware updates addressing the fromNetToolGet handler. Tracking entries are available at VulDB #315877 and VulDB CTI ID #315877.
Workarounds
- Place affected devices behind a firewall that blocks inbound HTTP/HTTPS access to the management interface from untrusted segments.
- Use network segmentation to isolate Tenda O3V2 bridges from general user and guest networks.
- Apply ACLs on upstream switches or routers to permit /goform/ endpoint access only from designated administrator IPs.
- Decommission or replace affected devices if vendor patches remain unavailable for extended periods.
# Example iptables rule restricting access to the Tenda O3V2 management interface
# Replace <admin_ip> with the trusted administrator address and <device_ip> with the bridge IP
iptables -A FORWARD -p tcp -s <admin_ip> -d <device_ip> --dport 80 -j ACCEPT
iptables -A FORWARD -p tcp -d <device_ip> --dport 80 -j DROP
iptables -A FORWARD -p tcp -d <device_ip> --dport 443 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
