CVE-2026-67596 CSL Mobile Limited CVE debrief

Who should care

Organizations using CSL 1010 M2M 3G WiFi Module firmware through 2.2.1.4, as well as managed security service providers and network administrators responsible for securing IoT devices, should prioritize patching due to the potential for attackers to recover all stored secrets in plaintext. Additionally, organizations with affected devices should review and update their security policies to ensure secure configuration and storage of sensitive information.

Technical summary

The CSL 1010 M2M 3G WiFi Module firmware through 2.2.1.4 contains a weak encryption vulnerability that allows unauthenticated attackers to recover all stored secrets in plaintext by reversing a single-byte XOR cipher using a static key to obfuscate the configuration backup file. This vulnerability has a medium CVSS score of 6.9 and can be exploited by attackers to gain unauthorized access to sensitive information.

Defensive priority

Organizations using CSL 1010 M2M 3G WiFi Module firmware through 2.2.1.4 should prioritize patching due to the medium CVSS score of 6.9 and the potential for attackers to recover all stored secrets in plaintext.

Recommended defensive actions

• Inventory CSL 1010 M2M 3G WiFi Module firmware versions to identify potentially affected devices.
• Apply patches or updates provided by the vendor to address the weak encryption vulnerability.
• Implement compensating controls, such as monitoring for suspicious activity related to the configuration backup file.
• Consider replacing affected devices if patches are not available or if the vulnerability cannot be mitigated.
• Review and update security policies to ensure secure configuration and storage of sensitive information.

Evidence notes

The CVE description indicates a weak encryption vulnerability in CSL 1010 M2M 3G WiFi Module firmware through 2.2.1.4, allowing unauthenticated attackers to recover all stored secrets in plaintext. The vulnerability uses a single-byte XOR cipher with a static key to obfuscate the configuration backup file. Evidence is limited to the CVE description and NVD detail. Defenders should verify the configuration backup file for potential exposure and review the firmware version of affected devices.

Official resources