Is there a patch available for CVE-2026-15486?

Yes, a patch is available for CVE-2026-15486. Update the affected software to the latest version immediately.

TRENDnet TEW-821DAP CVE-2026-15486

Q: What is the CVSS score of CVE-2026-15486?

CVE-2026-15486 has a CVSS 4.0 base score of 5.3 (Medium). CVSS 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/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: 0.2%.

EUVD-2026-43208 MEDIUM

OS Command Injection (CWE-78)

2026-07-12 VulDB

GHSA-xf2v-w36q-24wf

Command Injection Tew 821Dap Trendnet

5.3

CVSS 4.0 · Vendor: VulDB

Severity by source

Vendor (VulDB) PRIMARY

5.3 MEDIUM

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/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

vuln.today AI

8.8 HIGH

Network-reachable management UI with PR:L authentication; OS command injection on embedded firmware yields full device compromise, warranting C:H/I:H/A:H.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (VulDB).

CVSS VectorVendor: VulDB

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Lifecycle Timeline

Analysis Generated

Jul 12, 2026 - 09:00 vuln.today

DescriptionCVE.org

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.

AnalysisAI

OS command injection in TRENDnet TEW-821DAP firmware 1.11B03 allows a network-adjacent authenticated attacker to execute arbitrary shell commands by manipulating the hostname, username, or password parameters in the DDNS configuration handler at /goform/tools_ddns. The affected product is officially end-of-life - the vendor has declined to issue a patch and disputes ability to confirm the vulnerability on the v1.0R hardware revision. No public exploit code or CISA KEV listing has been identified at time of analysis, though the CWE-78 vulnerability class is trivial to weaponize once firmware internals are mapped via the linked IOT research repository.

Technical ContextAI

The vulnerability resides in function sub_42026C within the firmware binary handling the /goform/tools_ddns endpoint - a Dynamic DNS (DDNS) update form in the TRENDnet TEW-821DAP wireless access point (CPE: cpe:2.3:a:trendnet:tew-821dap:*:*:*:*:*:*:*:*). CWE-78 (Improper Neutralization of Special Elements used in an OS Command) indicates the firmware passes user-supplied input - specifically the hostname, username, or password fields - directly into a system() or equivalent shell call without adequate sanitization. This is a classic embedded firmware pattern where form handler code constructs shell commands for network configuration tasks (here, DDNS record updates) using unsanitized CGI parameters. The IOTRes GitHub repository (referenced as the patch source) documents firmware analysis for this product line, suggesting the function was identified through static binary analysis of the extracted firmware image.

RemediationAI

No vendor-released patch exists and none is forthcoming - TRENDnet has confirmed TEW-821DAP is end-of-life and will not address this vulnerability. The primary remediation is device replacement with a supported alternative. As an interim compensating control, restrict access to the device management web interface (TCP 80/443) to trusted management VLAN or localhost-only using upstream firewall ACLs; this removes the network attack vector but does not eliminate the flaw. Disable DDNS functionality if not operationally required, which removes the vulnerable endpoint from the attack surface but may break dynamic hostname resolution. Change default administrative credentials to strong unique passwords to reduce the risk from PR:L exploitation, though this does not patch the injection flaw itself. The IOT firmware research reference at https://github.com/IOTRes/IOT_Firmware_Update/blob/main/Trendnet/TEW-821DAP_CI4.md documents the vulnerability but does not provide a patched firmware binary.