CVE-2026-5527 Tenda CVE debrief

Who should care

Users of Tenda 4G03 Pro 1.0/1.0re/01.bin/04.03.01.53 should be aware of this weakness and take necessary precautions. This includes verifying the affected scope, reviewing vendor guidance, and implementing compensating controls to mitigate the vulnerability. Security teams and operators of the affected device should prioritize remediation and monitor for potential exploitation attempts.

Technical summary

The Tenda 4G03 Pro device has a weakness in its ECDSA P-256 Private Key Handler component. The issue is related to the use of a hard-coded cryptographic key in the /etc/www/pem/server.key file. This weakness can be exploited remotely, allowing an attacker to potentially access sensitive information or disrupt the device's functionality. The device's use of a hard-coded key compromises its security and makes it vulnerable to attacks.

Defensive priority

Medium priority due to the CVSS score of 5.5 and the potential for remote exploitation. Users should prioritize remediation and implement compensating controls to mitigate the vulnerability.

Recommended defensive actions

• Inventory and verify affected Tenda 4G03 Pro devices
• Check for and apply vendor remediation
• Implement compensating controls, such as monitoring and exception tracking
• Consider replacing affected devices if vendor remediation is not available
• Review relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-04-05T00:16:03.120Z and was last modified on 2026-07-24T09:10:00.153Z. The NVD entry is currently Analyzed. This information is based on the provided source corpus and may not reflect the full scope of the vulnerability. Users should verify the details with the official CVE record and NVD entry for the most accurate and up-to-date information.

Official resources