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CVE Record

CVE-2026-15487: TRENDnet TEW-821DAP Firmware Update system_ntp sub_41FBD0 os command injection

A vulnerability was found in TRENDnet TEW-821DAP 1.11B03. This impacts the function sub_41FBD0 of the file /goform/system_ntp of the component Firmware Update Handler. Performing a manipulation of the argument Hostname results in os command injection. The attack may be initiated 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
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2026-15487 is a reported command injection issue in the discontinued TRENDnet TEW-821DAP access point firmware 1.11B03. A remote authenticated user could manipulate an NTP-related hostname value and cause the device to run unintended operating-system commands. Business urgency is highest where these devices remain deployed, especially on reachable management networks.

Executive priority

Treat as a targeted remediation item, not an emergency based on current evidence. Prioritize replacement or isolation because the affected product is end-of-life and may not receive fixes. Escalate if any affected device is internet-facing or used in sensitive environments.

Technical view

The report maps the flaw to /goform/system_ntp, function sub_41FBD0, in the Firmware Update Handler. The Hostname argument is reportedly not safely neutralized, leading to OS command injection. CVSS v2 is 6.5 with network access, low complexity, and single authentication required. Listed CWEs are CWE-77 and CWE-78.

Likely exposure

Exposure appears limited to TRENDnet TEW-821DAP firmware 1.11B03, an end-of-life product. Risk depends on whether device administration endpoints are reachable and whether attackers can obtain valid credentials. Internet-facing or broadly reachable management interfaces raise concern.

Exploitation context

No CISA KEV listing or provided source states active exploitation. The vulnerability is described as remotely triggerable but requiring authentication. Public technical references exist, including VulDB entries and a GitHub write-up, so defenders should assume details may be accessible to researchers and attackers.

Researcher notes

Evidence is primarily third-party and vendor confirmation is limited by end-of-life status. The CVSS vector indicates authenticated remote exploitation. Avoid assuming broader TRENDnet impact beyond TEW-821DAP 1.11B03. The GitHub reference should be reviewed carefully for technical context without using offensive details.

Mitigation direction

  • Inventory for TRENDnet TEW-821DAP devices and firmware 1.11B03.
  • Remove or replace end-of-life TEW-821DAP devices where feasible.
  • Restrict management access to trusted administrative networks only.
  • Disable internet exposure of device administration interfaces.
  • Rotate device administrator credentials if exposure is suspected.
  • Check TRENDnet or trusted advisories for any available vendor guidance.

Validation and detection

  • Confirm whether TEW-821DAP devices exist in asset inventory.
  • Verify firmware version against 1.11B03.
  • Review network paths to /goform/system_ntp administration functionality.
  • Check whether management interfaces are internet-facing or broadly reachable.
  • Review authentication logs for unusual administrative access.
  • Monitor for unexpected configuration changes or device instability.
Prepared
Confidence
medium
Sources
7

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
cve · low confidence lookup

CVE-2026-15487 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-2026-15487Attack 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.