# CVE-2026-75783: TRENDnet TEW-WLC100P stack buffer overflow in DHCP handler

Source: https://junglewise.ai/threats/cve-2026-75783-trendnet-tew-wlc100p-stack-buffer-overflow-in-dhcp-handler  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-18. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-75783 · Severity: critical · CVSS 9.6 · Published 2026-08-18

The TRENDnet TEW-WLC100P is a wireless access point controller used to manage enterprise network connectivity. A stack buffer overflow vulnerability in its DHCP processing component allows an attacker on the local network to crash the device or execute arbitrary code by sending a specially crafted DHCP response, potentially compromising the controller and all connected wireless devices.

Technologies: [TRENDnet Tew-Wlc100p](https://junglewise.ai/threats/technologies/tew-wlc100p). Vendors: [TRENDnet](https://junglewise.ai/threats/vendors/trendnet).

## Quick answers

**Is CVE-2026-75783 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-75783 being exploited in the wild.

**How severe is CVE-2026-75783?** Critical severity, with a CVSS score of 9.6, published 18 August 2026.

**Which products and versions are affected?** TRENDnet Tew-Wlc100p 12.07b01.

**Is there a fix for CVE-2026-75783?** No fixed version is recorded yet. Check the vendor's advisory in the references below. 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-2026-75783 attacked?** It is attacked over the network or from the adjacent network, in a network appliance.

**Am I affected by CVE-2026-75783?** Check whether you run TRENDnet Tew-Wlc100p 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.

## Technical details

A stack-based buffer overflow exists in the netifd daemon's DHCP blobmsg handler (file /sbin/netifd) when processing DHCP Option 42 (NTP Server). The vulnerability is triggered when a malicious DHCP server on the same local network sends an oversized payload in this field, overflowing a fixed-size stack buffer. An attacker with network access on the LAN can craft a DHCP response that overwrites the return address register ($ra), redirecting execution to attacker-controlled memory. This enables remote code execution with the privileges of the netifd process. Exploitation requires the device to request or renew a DHCP lease and does not require authentication. A public proof-of-concept has been published demonstrating control of the instruction pointer.

## Affected products

- TRENDnet TEW-WLC100P 12.07b01

## Timeline

- 2026-08-18: disclosed
- exploited: Public proof-of-concept available

## References

- [https://github.com/meishigana/CVE/blob/main/team15_20260702/01_wlc100p-netifd/poc/poc-netifd-overflow.py](https://github.com/meishigana/CVE/blob/main/team15_20260702/01_wlc100p-netifd/poc/poc-netifd-overflow.py)
- [https://github.com/meishigana/CVE/tree/main/team15_20260702/01_wlc100p-netifd](https://github.com/meishigana/CVE/tree/main/team15_20260702/01_wlc100p-netifd)

## Related threats

- [TRENDnet TEW-WLC100P insecure IKE aggressive mode in racoon](https://junglewise.ai/threats/cve-2025-44649-trendnet-tew-wlc100p-insecure-ike-aggressive-mode-in-racoon)
- [TRENDnet TEW-WLC100P insecure strongSwan configuration](https://junglewise.ai/threats/cve-2025-44647-trendnet-tew-wlc100p-insecure-strongswan-configuration)