November 15, 2026

CVE Watchtower

CVE-2026-129352TRENDnet TEW-657BRM Stack-based Buffer Overflow

NVD

Vulnerability Summary

A vulnerability was detected in TRENDnet TEW-657BRM 1.00.1. This issue affects some unknown processing of the file /usr/sbin/upgrade_flash.cgi. Performing a manipulation of the argument boundary results in stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit is now public and may be used. The vendor explains: ""I am not able to confirm if such vulnerability exists as the product has been EOL for more than 15 years. We will send out an announcement letting customers know."
Severity Level
CRITICAL(9.4)
Published Date
Nov 14, 2026
Last Modified
Nov 14, 2026
Exploitation Status
Public exploit available
Root Weakness (CWE)
CWE-121: Stack-based Buffer Overflow β†—
The buffer being overwritten is allocated on the stack.
CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer β†—
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the intended boundary of the buffer.
CVSS v4.0 Base Metrics — Score 9.4 (CRITICAL)
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P
Attack VectorNetwork
Attack ComplexityLow
Attack RequirementsNone
Privileges RequiredHigh
User InteractionNone
Confidentiality (Vulnerable System)High
Integrity (Vulnerable System)High
Availability (Vulnerable System)High
Confidentiality (Subsequent System)High
Integrity (Subsequent System)High
Availability (Subsequent System)High
Show CVSS v3.x metrics (score 9.1)
CVSS v3.1 Base Metrics — Score 9.1 (CRITICAL)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredHigh
User InteractionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

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

  • Nov 14, 2026Published
  • Nov 14, 2026Record last modified
  • Nov 15, 2026PoC status changed: POC to UNKNOWN
  • Nov 15, 2026CVSS score changed: 9.4 to 8.5
  • Nov 15, 2026Severity changed: CRITICAL to HIGH
  • Nov 15, 2026PoC status changed: POC to UNKNOWN
  • Nov 15, 2026CVSS score changed: 9.4 to 8.5
  • Nov 15, 2026Severity changed: CRITICAL to HIGH
  • Nov 15, 2026PoC status changed: POC to UNKNOWN
  • Nov 15, 2026CVSS score changed: 9.4 to 8.5
  • Nov 15, 2026Severity changed: CRITICAL to HIGH

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