CVE-2026-5355Public exploitNetwork attack vector

Authenticated command execution via unchecked policy_name

Published Apr 2, 2026 · Updated Apr 2, 2026

OS command injection in TRENDnet TEW-657BRM firmware 1.00.1 allows remote authenticated users to execute commands via setup.cgi. The vpn_drop handler passes the request's policy_name value to the COMMAND function without validation, allowing shell metacharacters to alter the executed command. Access to the router's authenticated management interface is required, and successful exploitation runs attacker-supplied operating-system commands with the web process's privileges.

CVSS severity6.3
Medium
EPSS probability5.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in TRENDnet TEW-657BRM firmware 1.00.1 allows remote authenticated users to execute commands via setup.cgi. The vpn_drop handler passes the request's policy_name value to the COMMAND function without validation, allowing shell metacharacters to alter the executed command. Access to the router's authenticated management interface is required, and successful exploitation runs attacker-supplied operating-system commands with the web process's privileges.

The record

CVE
CVE-2026-5355
Published
Apr 2, 2026
Updated
Apr 2, 2026
Vendor
TRENDnet
Product
TEW-657BRM
Classifications
CWE-77, CWE-78, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.00.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

TRENDnet · TEW-657BRMversion=1.00.1

Published CVSS scores

6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P
2.1VulDBCVSS: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:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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