CVE-2026-75976Public exploitNetwork attack vector

Authenticated code execution via unchecked WAN password copy

Published Aug 18, 2026 · Updated Aug 25, 2026

Stack-based buffer overflow in TRENDnet TEW-823DRU 1.1.02b01 allows remote authenticated users to execute code via WAN settings. The /cgi-bin/wan.cgi handler copies the attacker-controlled wan_l2tp_password NVRAM value with strcpy into a fixed-size stack buffer without validating its length. Access to the router management interface is required; exploitation can corrupt control flow, execute code on the appliance, or crash it.

CVSS severityUnavailable
Unscored
EPSS probability0.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Stack-based buffer overflow in TRENDnet TEW-823DRU 1.1.02b01 allows remote authenticated users to execute code via WAN settings. The /cgi-bin/wan.cgi handler copies the attacker-controlled wan_l2tp_password NVRAM value with strcpy into a fixed-size stack buffer without validating its length. Access to the router management interface is required; exploitation can corrupt control flow, execute code on the appliance, or crash it.

The record

CVE
CVE-2026-75976
Published
Aug 18, 2026
Updated
Aug 25, 2026
Vendor
TRENDnet
Product
TEW-823DRU
Classifications
CWE-121, CWE-119, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=1.1.02b01

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

TRENDnet · TEW-823DRUversion=1.1.02b01

Published CVSS scores

9.4VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P
9.9VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R
9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR
9.9VulDBCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-119Memory Corruption
T1190Exploit Public-Facing Application

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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