# CVE-2026-129351: TRENDnet TEW-657BRM mini_httpd setup.cgi sprintf out-of-bounds write

Status: published. Published: 2026-11-14. Updated: 2026-11-14.

A security vulnerability has been detected in TRENDnet TEW-657BRM 1.00.1. This vulnerability affects the function sprintf of the file /setup.cgi of the component mini_httpd. Such manipulation leads to out-of-bounds write. The attack can be executed remotely. The exploit has been disclosed publicly and may be used. The vendor explains: ""I am not able to confirm if such vulnerability exists as the product has been EOL for more than 15 years. We will send out an announcement letting customers know." This vulnerability only affects products that are no longer supported by the maintainer.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- TRENDnet / TEW-657BRM: 1.00.1 (affected). Source: CNA: VulDB

## Severity and prioritization

- CVSS 4.0: 10 (critical); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P; source: CNA: VulDB

- CVSS 3.1: 10 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R; source: CNA: VulDB

- CVSS 3.0: 10 (critical); CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R; source: CNA: VulDB

- CVSS 2.0: 10 (critical); AV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:UR; source: CNA: VulDB

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-787, CWE-119

## Exploit evidence

- exploit: https://github.com/ruanyi101/router-firmware-security-advisories/blob/main/router-firmware-GitHub-advisories/advisories/TRENDnet-TEW-657BRM-mini_httpd.md (CNA: VulDB)

## References

- https://vuldb.com/vuln/437397 (CNA: VulDB; vdb-entry, technical-description)

- https://vuldb.com/vuln/437397/cti (CNA: VulDB; signature, permissions-required)

- https://vuldb.com/cve/CVE-2026-129351 (CNA: VulDB; third-party-advisory)

- https://vuldb.com/submit/1043518 (CNA: VulDB; third-party-advisory)

- https://github.com/ruanyi101/router-firmware-security-advisories/blob/main/router-firmware-GitHub-advisories/advisories/TRENDnet-TEW-657BRM-mini_httpd.md (CNA: VulDB; exploit)

## Provenance

- CNA: VulDB: https://www.cve.org/CVERecord?id=CVE-2026-129351; retrieved 2026-11-14; source updated 2026-11-14

Revision: a6d1bf32a4eef69d000cbf4004b4313a084a8cd6c971db3d90f7ab8d8f8d6134

Canonical: https://y2.dev/cve/CVE-2026-129351

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