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CVE Record

CVE-2026-10121: TRENDnet TEW-432BRP formSetUrlFilter stack-based overflow

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.

CriticalCVSS 9Not KEV-listedUpdated
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Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

CVE-2026-10121 affects an obsolete TRENDnet TEW-432BRP router firmware version. A malformed URL-filter keyword can overflow memory and potentially let an attacker compromise the device. The product has been end-of-life since 2009, and TRENDnet says it cannot replicate or fix the issue.

Executive priority

Prioritize removal over patching. The issue is critical, public exploit material exists, and the vendor states the product is too old to fix. Any deployed device should be treated as unsupported infrastructure risk.

Technical view

The vulnerable component is /goform/formSetUrlFilter in TEW-432BRP 3.10B20. Manipulation of keyword_list/keyword can trigger a stack-based buffer overflow, mapped to CWE-119 and CWE-121. The CVSS v2 vector is network reachable with low complexity but single authentication required: AV:N/AC:L/Au:S/C:C/I:C/A:C.

Likely exposure

Exposure is likely limited to organizations still operating TRENDnet TEW-432BRP devices on firmware 3.10B20. Risk rises sharply if the router administration surface is reachable from untrusted networks or reused credentials allow authenticated access.

Exploitation context

The source bundle says exploit material has been published and may be used, but KEV is false and no cited source confirms active exploitation in the wild. Treat this as public exploit availability, not confirmed active exploitation.

Researcher notes

Do not broaden scope beyond TEW-432BRP 3.10B20 based on the provided evidence. The authentication requirement in the CVSS vector matters for exposure analysis, but internet-reachable management still creates material risk. Evidence for active exploitation is not provided.

Mitigation direction

  • Retire and replace affected TEW-432BRP devices.
  • Remove administrative access from internet-facing or untrusted networks.
  • Restrict management access to trusted admin networks only.
  • Rotate router credentials if affected devices were exposed.
  • Check TRENDnet guidance, but expect no vendor fix for this EOL product.

Validation and detection

  • Inventory networks for TRENDnet TEW-432BRP devices.
  • Confirm firmware version 3.10B20 from device records or admin UI.
  • Check whether management interfaces are reachable from untrusted networks.
  • Review logs for crashes or unexpected URL-filter configuration changes.
  • Verify affected devices are replaced or isolated.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-119: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cwe · low confidence lookup

CWE-121: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2026-10121 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Critical
CVSS
9 (2.0)
Known Exploited
No
Published

Vector: AV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

4CVSS vectors
6Timeline events
1ADP providers
5Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: pocAutomatable: noTechnical Impact: total

CVSS vector scores

4 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
9CVSS 2.0CriticalAV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR810VulDB
8.8CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R2.85.9VulDB
8.8CVSS 3.0HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R2.85.9VulDB
8.7CVSS 4.0HighCVSS: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——VulDB

Vulnerability scoring details

Base CVSS 4.0 score

8.7High
CVSS 4.0 vector shape for CVE-2026-10121Attack VectorAttack ComplexityAttack RequirementsPrivileges RequiredUser InteractionVS ConfidentialityVS IntegrityVS AvailabilitySS ConfidentialitySS IntegritySS Availability

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Attack Requirements
NonePresent
Privileges Required
NoneLowHigh
User Interaction
NonePassiveActive
VS Confidentiality
HighLowNone
VS Integrity
HighLowNone
VS Availability
HighLowNone
SS Confidentiality
HighLowNone
SS Integrity
HighLowNone
SS Availability
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. Source timelineVulDB

    Advisory disclosed

  2. Source timelineVulDB

    VulDB entry created

  3. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  4. Source timelineVulDB

    VulDB entry last update

  5. CVE publishedCVE Program

    The CVE record was published.

  6. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
TRENDnetTEW-432BRP3.10B20Listed
Weakness

CWE details

CWE-119CWE-121

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.