# CVE-2026-109157: TRENDnet TEW-432BRP stack buffer overflow in formTcpipSetup

Source: https://junglewise.ai/threats/cve-2026-109157-a-vulnerability-was-found-in-trendnet-tew-432brp-3-10b20  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-13. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-109157 · Severity: critical · CVSS 9.9 · Published 2026-10-13

TRENDnet TEW-432BRP is a router that provides network connectivity for home and small business users. A stack-based buffer overflow vulnerability in the router's network configuration handler allows a remote attacker to crash the device or potentially execute arbitrary code by sending a specially crafted request with an oversized name parameter. The affected router reached end-of-life in 2011 and is no longer supported by the vendor.

Technologies: [TRENDnet TEW-432BRP](https://junglewise.ai/threats/technologies/tew-432brp). Vendors: [TRENDnet](https://junglewise.ai/threats/vendors/trendnet).

## Quick answers

**Is CVE-2026-109157 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-109157 being exploited in the wild.

**How severe is CVE-2026-109157?** Critical severity, with a CVSS score of 9.9, published 13 October 2026.

**Which products and versions are affected?** TRENDnet TEW-432BRP 3.10B20.

**Is there a fix for CVE-2026-109157?** No fixed version is recorded yet. Discontinue use of this router as it is no longer supported and no patches will be provided by the vendor. Replace with a current-generation router that receives security updates. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-109157 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-109157?** Check whether you run TRENDnet TEW-432BRP at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix


Discontinue use of this router as it is no longer supported and no patches will be provided by the vendor. Replace with a current-generation router that receives security updates.

## Technical details

The formTcpipSetup function in the router's web interface directly copies user-supplied input from the "name" parameter into a fixed-size stack buffer without bounds checking, causing a stack-based buffer overflow. An unauthenticated remote attacker can exploit this via a crafted POST request to /goform/formTcpipSetup to crash the router or achieve code execution. No patch is available as the product reached end-of-life in 2011.

## Affected products

- TRENDnet TEW-432BRP 3.10B20

## Timeline

- 2026-10-13: disclosed
- other: Product reached end-of-life in 2011; vendor confirms no testing possible and no fix will be issued

## References

- [https://github.com/wudipjq/my_vuln/blob/main/TRENDnet/vuln_21/21.md](https://github.com/wudipjq/my_vuln/blob/main/TRENDnet/vuln_21/21.md)
- [https://vuldb.com/cve/CVE-2026-109157](https://vuldb.com/cve/CVE-2026-109157)

## Related threats

- [TRENDnet TEW-432BRP stack overflow in formWlanSetup](https://junglewise.ai/threats/cve-2026-10183-trendnet-tew-432brp-stack-overflow-in-formwlansetup)
- [TRENDnet TEW-432BRP command injection in formWlanSetup](https://junglewise.ai/threats/cve-2026-10182-trendnet-tew-432brp-command-injection-in-formwlansetup)
- [TRENDnet TEW-432BRP stack overflow in formSysCmd](https://junglewise.ai/threats/cve-2026-10181-trendnet-tew-432brp-stack-overflow-in-formsyscmd)
- [TRENDnet TEW-432BRP command injection in formSysCmd](https://junglewise.ai/threats/cve-2026-10180-trendnet-tew-432brp-command-injection-in-formsyscmd)
- [TRENDnet TEW-432BRP stack overflow in formSetWlanEncrypt](https://junglewise.ai/threats/cve-2026-10179-trendnet-tew-432brp-stack-overflow-in-formsetwlanencrypt)