# CVE-2026-15484: TRENDnet TEW-821DAP buffer overflow in tools_nslookup

Source: https://junglewise.ai/threats/cve-2026-15484-trendnet-tew-821dap-buffer-overflow-in-tools-nslookup  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-12. Updated: 2026-07-12  
License: CC BY 4.0 with a link back

CVE-2026-15484 · Severity: high · CVSS 8.8 · Published 2026-07-12

A security vulnerability exists in the TRENDnet TEW-821DAP wireless access point, a device used to provide Wi-Fi connectivity in business environments. An attacker can exploit this flaw to cause a system crash or potentially take control of the device by sending a specially crafted network request. Because this product has reached its end-of-life status, the manufacturer is not providing security updates, leaving affected devices permanently exposed to this risk.

Technologies: [TRENDnet TEW-821DAP](https://junglewise.ai/threats/technologies/tew-821dap). Vendors: [TRENDnet](https://junglewise.ai/threats/vendors/trendnet).

## Quick answers

**Is CVE-2026-15484 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-15484 being exploited in the wild.

**How severe is CVE-2026-15484?** High severity, with a CVSS score of 8.8, published 12 July 2026.

**Which products and versions are affected?** TRENDnet TEW-821DAP 1.12B01.

**Is there a fix for CVE-2026-15484?** 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-2026-15484 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-15484?** Check whether you run TRENDnet TEW-821DAP 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 'ssi' component of TRENDnet TEW-821DAP firmware version 1.12B01. The vulnerability is located in function sub_41EC14 within the /goform/tools_nslookup handler. The root cause is an insufficient buffer allocation (2 bytes) for a command string that is at least 33 bytes long ("nslookup ${host} > /tmp/nslookup"). An authenticated remote attacker can trigger this overflow by sending an HTTP POST request to the affected endpoint. Successful exploitation could lead to remote code execution (RCE) or a device crash. The vendor has stated the product is End-of-Life (EOL) and will not be patched.

## Affected products

- TRENDnet TEW-821DAP 1.12B01

## Timeline

- 2026-07-12: advisory: NVD publication date

## References

- [https://github.com/IOTRes/IOT_Firmware_Update/blob/main/Trendnet/TEW-821DAP_BO3.md](https://github.com/IOTRes/IOT_Firmware_Update/blob/main/Trendnet/TEW-821DAP_BO3.md)
- [https://vuldb.com/cve/CVE-2026-15484](https://vuldb.com/cve/CVE-2026-15484)
- [https://vuldb.com/submit/842381](https://vuldb.com/submit/842381)
- [https://vuldb.com/vuln/377791](https://vuldb.com/vuln/377791)
- [https://vuldb.com/vuln/377791/cti](https://vuldb.com/vuln/377791/cti)

## Related threats

- [TRENDnet TEW-821DAP stack-based buffer overflow in NTP timezone configuration](https://junglewise.ai/threats/cve-2026-77946-trendnet-tew-821dap-stack-based-buffer-overflow-in-ntp-timezone)
- [TRENDnet TEW-821DAP command injection in upload.cgi](https://junglewise.ai/threats/cve-2026-77945-trendnet-tew-821dap-command-injection-in-upload-cgi)
- [TRENDnet TEW-821DAP OS command injection in system_ntp](https://junglewise.ai/threats/cve-2026-15487-trendnet-tew-821dap-os-command-injection-in-system-ntp)
- [TRENDnet TEW-821DAP OS command injection in tools_ddns](https://junglewise.ai/threats/cve-2026-15486-trendnet-tew-821dap-os-command-injection-in-tools-ddns)
- [TRENDnet TEW-821DAP command injection in DNS Lookup Handler](https://junglewise.ai/threats/cve-2026-15485-trendnet-tew-821dap-command-injection-in-dns-lookup-handler)