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CVE Record

CVE-2026-10120: TRENDnet TEW-432BRP formSetFirewallRule stack-based overflow

A vulnerability was detected in TRENDnet TEW-432BRP 3.10B20. The affected element is the function formSetFirewallRule of the file /goform/formSetFirewallRule. The manipulation of the argument firewall_name results in stack-based buffer overflow. The attack can be executed remotely. The exploit is now public 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

This affects an obsolete TRENDnet TEW-432BRP router firmware. A remote authenticated user may be able to crash or take over the device through a firewall rule name overflow. TRENDnet says the product has been end-of-life since 2009 and cannot be fixed.

Executive priority

Prioritize replacement over patch planning. The affected router is long unsupported, the flaw is critical, and public exploit material exists. Any remaining device should be treated as a business risk until removed or strongly isolated.

Technical view

CVE-2026-10120 is a stack-based buffer overflow in /goform/formSetFirewallRule, triggered through the firewall_name argument on TEW-432BRP 3.10B20. The CVSS v2 vector indicates network access, low complexity, and single authentication. Public proof-of-concept material is referenced, but KEV is false.

Likely exposure

Exposure is likely limited to organizations still using TRENDnet TEW-432BRP 3.10B20, especially where the router management surface is reachable by untrusted or broadly shared accounts. Supported TRENDnet products are not identified as affected in the supplied sources.

Exploitation context

The source bundle states the exploit is public and may be used. It does not show confirmed in-the-wild exploitation, and the CVE is not listed as KEV. Treat public exploit availability plus no vendor fix as urgent for any remaining deployments.

Researcher notes

Evidence points to CWE-119/CWE-121 memory corruption in formSetFirewallRule. Authentication is required per CVSS, but source detail is limited. Avoid assuming code execution details, affected variants, or active exploitation beyond the supplied VulDB/CVE information.

Mitigation direction

  • Replace affected TEW-432BRP devices with supported hardware.
  • Remove management access from the internet and untrusted networks.
  • Restrict administration to a dedicated trusted management network.
  • Review vendor and CVE guidance for any later updates.
  • Disable or decommission devices that cannot be replaced promptly.

Validation and detection

  • Inventory networks for TRENDnet TEW-432BRP devices.
  • Confirm whether any device runs firmware version 3.10B20.
  • Check whether management interfaces are reachable from untrusted networks.
  • Review logs for unexpected firewall rule changes or admin access.
  • Document any compensating controls for devices awaiting replacement.
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.

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cve · low confidence lookup

CVE-2026-10120 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-2026-10120Attack 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.