CVE-2026-7611
Insufficient Firmware Authenticity Check in TRENDnet TEW-821DAP
Publication date: 2026-05-02
Last updated on: 2026-05-06
Assigner: VulDB
Description
Description
CVSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| trendnet | tew-821dap_firmware | 1.12b01 |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-345 | The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability affects the Trendnet TEW-821DAP device firmware version up to 1.12B01, specifically in the function platform_do_upgrade_cameo_dev within the cameo_dev.sh script. The firmware update handler uses a CRC32 checksum to verify firmware integrity, but this method is insufficient because attackers can obtain the CRC32 value and craft malicious firmware with the same checksum. This allows the malicious firmware to bypass verification and be installed on the device.
Exploiting this vulnerability could enable an attacker to execute arbitrary code or cause a denial of service on the affected IoT device.
How can this vulnerability impact me? :
If exploited, this vulnerability can allow an attacker to remotely install malicious firmware on the affected device, leading to arbitrary code execution or denial of service. This compromises the device's normal operation and security, potentially allowing unauthorized control or disruption of the device.
How can this vulnerability be detected on my network or system? Can you suggest some commands?
This vulnerability affects the Trendnet TEW-821DAP device firmware version up to 1.12B01, specifically in the platform_do_upgrade_cameo_dev function of the cameo_dev.sh script. Detection involves verifying if the device is running the vulnerable firmware version.
You can check the firmware version on the device by accessing its management interface or via command line if supported. For example, if you have shell access to the device, you might use commands like:
- cat /etc/version
- cat /proc/version
- strings /bin/cameo_dev.sh | grep platform_do_upgrade_cameo_dev
Additionally, monitoring network traffic for suspicious firmware upgrade attempts or unexpected device reboots could help detect exploitation attempts.
What immediate steps should I take to mitigate this vulnerability?
Since the affected firmware version is no longer supported and the product has been end-of-life for 8 years, the best mitigation is to discontinue use of the vulnerable device.
If replacement is not immediately possible, you should restrict network access to the device to trusted networks only, disable remote firmware upgrades if possible, and monitor for any unusual activity.
Avoid exposing the device to untrusted networks and consider isolating it in a segmented network to reduce the risk of remote exploitation.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
The provided information does not specify any direct impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.