LiveActive security incident?Get immediate response
CVE Record

CVE-2026-15486: TRENDnet TEW-821DAP Firmware Update tools_ddns sub_42026C os command injection

A vulnerability has been found in TRENDnet TEW-821DAP 1.11B03. This affects the function sub_42026C of the file /goform/tools_ddns of the component Firmware Update Handler. Such manipulation of the argument hostname/username/password leads to os command injection. The attack can be launched remotely. The vendor explains: "We are unable to confirm the existence of the vulnerabilities for (...) TEW-821DAP (v1.0R) as these items have been EOL. " This vulnerability only affects products that are no longer supported by the maintainer.

MediumCVSS 6.5Not KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2026-15486 is a reported command injection issue in TRENDnet TEW-821DAP firmware 1.11B03. A remote, authenticated user could manipulate DDNS-related fields to run operating system commands. The device is end-of-life, and the vendor reportedly could not confirm the issue for unsupported hardware, so replacement planning is important.

Executive priority

Treat as a replacement and exposure-reduction priority for any deployed TEW-821DAP units. Urgency is higher if management access is remotely reachable or shared credentials are used.

Technical view

The report identifies OS command injection in sub_42026C within /goform/tools_ddns, affecting hostname, username, and password parameters in the Firmware Update Handler/DDNS path. CVSS v2 is 6.5 with network access, low complexity, and single authentication required. CWEs listed are CWE-77 and CWE-78.

Likely exposure

Exposure is limited to organizations still operating TRENDnet TEW-821DAP devices running firmware 1.11B03, especially where the management interface is reachable by untrusted networks or many users have device credentials.

Exploitation context

The source states the attack can be launched remotely but requires authentication. No CISA KEV listing or cited source confirms active exploitation. The affected product is no longer supported, which increases operational risk if the report is accurate.

Researcher notes

Evidence is based on third-party VulDB/CVE reporting and a linked GitHub report. The vendor statement says the device is EOL and the vendor was unable to confirm vulnerabilities for TEW-821DAP v1.0R. Do not assume a vendor patch exists from the supplied evidence.

Mitigation direction

  • Inventory TRENDnet TEW-821DAP devices and firmware versions.
  • Restrict management access to trusted administrative networks only.
  • Remove internet exposure for device administration interfaces.
  • Rotate credentials for administrative and DDNS-related accounts.
  • Check TRENDnet guidance and plan replacement for EOL devices.
  • Monitor logs for suspicious authenticated configuration changes.

Validation and detection

  • Confirm whether TEW-821DAP firmware 1.11B03 exists in the environment.
  • Verify management interfaces are not internet-accessible.
  • Review who has credentials to administer affected devices.
  • Check configuration history for unexpected DDNS or firmware-related changes.
  • Track vendor or CVE updates for confirmation and remediation details.
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 · medium confidence lookup

CWE-77: Command execution behavior lookup

Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. 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
cwe · medium confidence lookup

CWE-78: Command execution behavior lookup

Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. 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
description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
description · low confidence lookup

Credential and access behavior lookup

The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2026-15486 mapping review

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

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.5 (2.0)
Known Exploited
No
Published

Vector: AV:N/AC:L/Au:S/C:P/I:P/A:P/E:ND/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
0ADP providers
6Source links

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
6.5CVSS 2.0MediumAV:N/AC:L/Au:S/C:P/I:P/A:P/E:ND/RL:ND/RC:UR86.4VulDB
6.3CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:X/RL:X/RC:R2.83.4VulDB
6.3CVSS 3.0MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:X/RL:X/RC:R2.83.4VulDB
5.3CVSS 4.0MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X——VulDB

Vulnerability scoring details

Base CVSS 4.0 score

5.3Medium
CVSS 4.0 vector shape for CVE-2026-15486Attack 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:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X

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.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
TRENDnetTEW-821DAP1.11B03Listed
Weakness

CWE details

CWE-77CWE-78

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