November 15, 2026

CVE Watchtower

CVE-2026-5355Trendnet TEW-657BRM OS Command Injection

NVD

Vulnerability Summary

A vulnerability has been found in Trendnet TEW-657BRM 1.00.1. Affected by this issue is the function vpn_drop of the file /setup.cgi. The manipulation of the argument policy_name leads to os command injection. The attack is possible to be carried out remotely. The exploit has been disclosed to the public and may be used. The vendor confirms, that "[t]he product in question (...) has been discontinued and end of life since June 23, 2011, that is more than 14 years ago. We no longer provide support for this product, so we are not able to confirm the vulnerabilities. We will make an announcement on our website's product support page and notify customers who registered their products with us." This vulnerability only affects products that are no longer supported by the maintainer.
Severity Level
MEDIUM(6.3)
Published Date
Apr 2, 2026
Last Modified
Apr 2, 2026
Exploitation Status
Public exploit available
EPSS Score (30-Day)
0.30%Probability
Root Weakness (CWE)
CWE-78: OS Command Injection β†—
The software constructs all or part of an OS command using externally-influenced input, but does not properly neutralize special elements.
CWE-77: Command Injection β†—
The product constructs all or part of a command using externally-influenced input but does not neutralize special elements that could modify the intended command.
CVSS v4.0 Base Metrics — Score 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:P
Attack VectorNetwork
Attack ComplexityLow
Attack RequirementsNone
Privileges RequiredLow
User InteractionNone
Confidentiality (Vulnerable System)Low
Integrity (Vulnerable System)Low
Availability (Vulnerable System)Low
Confidentiality (Subsequent System)None
Integrity (Subsequent System)None
Availability (Subsequent System)None
Show CVSS v3.x metrics (score 6.3)
CVSS v3.1 Base Metrics — Score 6.3 (MEDIUM)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityLow
IntegrityLow
AvailabilityLow

Affected & Patched Versions

Affected Versions
  • Trendnet TEW-657BRM 1.00.1
Patched Versions
No patched version published yet
Until a fix ships, reduce exposure:
  • Restrict access to the affected service or interface to trusted networks.
  • Disable the affected feature if you do not need it.
  • Watch the vendor advisory for a firmware or software update.

What to do

Prioritize this fix. Exploit code is public, so attacks can follow quickly.

  1. Check whether you run Trendnet TEW-657BRM and which version.
  2. No patched version is listed yet. Limit access to the affected service to trusted networks, and disable the feature if you can.
  3. Subscribe to the vendor advisory so you learn when a fix ships.
  4. Review logs and exposed services for signs of earlier compromise.

Timeline

  • Apr 2, 2026Published
  • Apr 2, 2026Record last modified

Score, severity and exploitation changes are tracked from the day Watchtower started logging them.

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External References

Data last checked: Nov 15, 2026 01:08 UTC