Which versions of TRENDnet TEW-432BRP are affected by CVE-2026-10121?

The TRENDnet TEW-432BRP router (firmware 3.10B20) contains a stack-based buffer overflow in its web interface that permits authenticated remote code execution.

Is there a public PoC exploit available for CVE-2026-10121?

Yes, a public proof-of-concept exploit is available for CVE-2026-10121. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-10121?

Within 24 hours: Scan network for all TRENDnet TEW-432BRP 3.10B20 devices and map internet exposure. Within 7 days: Implement firewall rules restricting all HTTP/HTTPS access to the router's administrative interface to trusted administrative networks only; disable remote management if enabled; prepare for device replacement. Within 30 days: Replace all affected TRENDnet TEW-432BRP units with current-generation routers from vendors with active firmware support and decommission the legacy devices.

TRENDnet TEW-432BRP CVE-2026-10121

Q: What is the CVSS score of CVE-2026-10121?

CVE-2026-10121 has a CVSS 4.0 base score of 7.4 (High). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.0%.

EUVD-2026-33463 HIGH

Stack-based Buffer Overflow (CWE-121)

2026-05-30 VulDB

GHSA-rpcp-pxcr-gpx8

Buffer Overflow Stack Overflow Tew 432Brp

7.4

CVSS 4.0 · Vendor: VulDB

Severity by source

Vendor (VulDB) PRIMARY

7.4 HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from Vendor (VulDB) · only source for this CVE.

CVSS VectorVendor: VulDB

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Lifecycle Timeline

Analysis Updated

May 30, 2026 - 16:31 vuln.today

v3 (cvss_changed)

Analysis Updated

May 30, 2026 - 16:31 vuln.today

v2 (cvss_changed)

Re-analysis Queued

May 30, 2026 - 16:22 vuln.today

cvss_changed

CVSS changed

May 30, 2026 - 16:22 NVD

8.8 (HIGH) 7.4 (HIGH)

Analysis Generated

May 30, 2026 - 15:45 vuln.today

DescriptionCVE.org

A flaw has been found in TRENDnet TEW-432BRP 3.10B20. The impacted element is the function formSetUrlFilter of the file /goform/formSetUrlFilter. This manipulation of the argument keyword_list/keyword causes stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit has been published and may be used. The vendor explains: "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." This vulnerability only affects products that are no longer supported by the maintainer.

AnalysisAI

Stack-based buffer overflow in TRENDnet TEW-432BRP 3.10B20 router firmware allows remote authenticated attackers to corrupt memory and likely execute arbitrary code by sending crafted keyword_list or keyword parameters to the /goform/formSetUrlFilter endpoint. Publicly available exploit code exists on GitHub, and the vendor has explicitly refused to issue a fix because the device has been end-of-life since 2009. No CISA KEV listing at this time, but the combination of public PoC, network reachability, and unpatched status makes any internet-exposed device a standing target.

Technical ContextAI

The TEW-432BRP is a legacy SOHO wireless router whose web-administration interface is built on the goform/* CGI-style handler convention common in embedded Realtek/Broadcom MIPS firmware of that era. The vulnerable formSetUrlFilter handler processes the keyword_list and keyword HTTP parameters used by the URL filtering / parental-control feature and copies them into a fixed-size stack buffer without bounds checking, matching CWE-121 (Stack-based Buffer Overflow). On these MIPS-based embedded devices the web daemon typically runs as root with no ASLR, no stack canaries, and no NX, so a stack overflow is straightforwardly turnable into arbitrary code execution or, at minimum, reliable denial of service.

RemediationAI

No vendor-released patch identified at time of analysis - TRENDnet has formally declined to fix the issue due to the product's 2009 end-of-life status, so the only durable remediation is to decommission the TEW-432BRP and replace it with a currently supported router. Until replacement, owners should disable remote/WAN management of the web administration interface, restrict LAN-side access to the admin UI to a single trusted management host via firewall ACLs, change the default admin credentials to a strong unique password to make the PR:L authentication barrier meaningful, and disable the URL-filtering feature that exposes formSetUrlFilter where the feature is not in use (note this removes any parental-control functionality the household relied on). Network operators should also block inbound TCP/80 and TCP/443 to these devices at the upstream firewall and treat the LAN segment hosting the router as semi-trusted. See https://vuldb.com/vuln/367298 for tracking.