CVE-2026-10062 Overview
CVE-2026-10062 is a stack-based buffer overflow vulnerability in the TRENDnet TEW-432BRP wireless router running firmware version 3.10B20. The flaw resides in the formSetRoute function handling requests to /goform/formSetRoute. Attackers can trigger memory corruption by manipulating the ip, mask, or gateway arguments. The vulnerability is remotely exploitable and has been publicly disclosed. TRENDnet confirmed the device reached end-of-life (EOL) status in 2009 and will not issue a fix. Affected devices remain permanently vulnerable and require replacement.
Critical Impact
Remote attackers with low-privilege access can corrupt router memory via the routing configuration endpoint, potentially leading to arbitrary code execution or device compromise on an unsupported product with no available patch.
Affected Products
- TRENDnet TEW-432BRP hardware appliance (EOL since 2009)
- TRENDnet TEW-432BRP firmware version 3.10B20
- Any deployment exposing the router web administration interface
Discovery Timeline
- 2026-05-29 - CVE-2026-10062 published to NVD
- 2026-06-03 - Last updated in NVD database
Technical Details for CVE-2026-10062
Vulnerability Analysis
The vulnerability is classified under [CWE-119] as an improper restriction of operations within the bounds of a memory buffer. The defect lives in the formSetRoute handler exposed at /goform/formSetRoute in the router's embedded web server. When an authenticated user submits a static route entry, the handler copies the ip, mask, and gateway parameters into fixed-size stack buffers without validating input length. Oversized values overwrite adjacent stack memory, including saved return addresses on the MIPS-based platform. The exploit details have been publicly disclosed through a GitHub vulnerability report and VulDB entries.
Root Cause
The root cause is missing bounds checking on user-supplied HTTP form parameters before they are written to stack-allocated buffers. Embedded web frameworks on legacy SOHO routers frequently use unsafe string operations such as strcpy or sprintf against attacker-controlled inputs. Because the TEW-432BRP has been EOL since 2009, the codebase predates modern stack protections like canaries, ASLR, and non-executable stacks common on current firmware builds.
Attack Vector
An attacker reachable on the network with low-privileged credentials submits a crafted HTTP POST request to /goform/formSetRoute containing oversized ip, mask, or gateway values. The malformed values overflow the destination stack buffer and overwrite the function return address. Successful exploitation can crash the router (denial of service) or, with reliable ROP gadgets, achieve arbitrary code execution on the device. Exploitation requires network reachability to the router's management interface, which is dangerous when remote administration is enabled or when the attacker resides on the LAN.
No verified proof-of-concept code is reproduced here. Technical details are referenced in the GitHub Vulnerability Report and VulDB #367148.
Detection Methods for CVE-2026-10062
Indicators of Compromise
- Unexpected reboots, crashes, or watchdog resets of TRENDnet TEW-432BRP devices on the network
- HTTP POST requests to /goform/formSetRoute containing abnormally long ip, mask, or gateway parameter values
- Routing table modifications that were not initiated by an administrator
- Outbound traffic from the router itself to unfamiliar external hosts, indicating possible post-exploitation activity
Detection Strategies
- Inspect network traffic for HTTP requests targeting /goform/formSetRoute with parameter lengths exceeding typical IPv4 string sizes (greater than 15 characters)
- Use network sensors or IDS signatures to alert on overlong values in routing configuration form fields
- Correlate router management-plane traffic against an allowlist of administrative source addresses
- Audit the network for any remaining TEW-432BRP devices using passive fingerprinting or active inventory scans
Monitoring Recommendations
- Forward router syslog and HTTP access logs to a centralized analytics platform for long-term retention
- Monitor LAN segments for new or unauthorized devices acting as gateways or DNS resolvers
- Track DHCP and ARP tables for sudden changes in default gateway MAC addresses, which may indicate router compromise
How to Mitigate CVE-2026-10062
Immediate Actions Required
- Decommission and replace all TRENDnet TEW-432BRP devices. The vendor confirmed no patch will be released because the product has been EOL since 2009.
- If immediate replacement is not possible, isolate the device on a segmented network and block inbound access to the web management interface from untrusted networks.
- Disable remote administration features and restrict management access to a single hardened administrative host.
- Rotate router administrative credentials and audit existing static routes for unauthorized entries.
Patch Information
No patch is available. TRENDnet stated: "This product has been EOL for 15 years (since 2009). As the item has been EOL for such a long time, we are not able to replicate or fix any vulnerabilities." Replacement with a currently supported router is the only complete remediation. References: VulDB #367148 and the GitHub Vulnerability Report.
Workarounds
- Place the device behind an upstream firewall and deny inbound HTTP/HTTPS traffic to the router's management interface
- Restrict the router's management VLAN to a dedicated administrative subnet with strict ACLs
- Disable any port-forwarding rules that expose the web administration interface to the internet
- Plan and execute hardware replacement as the long-term remediation; no configuration change eliminates the underlying buffer overflow
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
