What’s Vulnerable › Vulnerabilities

CVE-2026-67596: CSL 1010 M2M 3G WiFi Module 2.2.1.4 Weak Encryption via Router.cfg

• Severity: medium (CVSS 6.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-30 · updated 2026-10-23
• Weakness: CWE-261

Description

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 that uses a static key to obfuscate the configuration backup file. Attackers can trivially decrypt the Router.cfg backup file to expose web administration and telnet passwords, WPA/WPA2 pre-shared keys, PPPoE and 3G/APN credentials, and SIM identifiers including IMSI and IMEI.

Affected products

• CSL Mobile Limited CSL 1010 M2M 3G WiFi Module: through 2.2.1.4

References

• https://1010.com.hk/
• https://www.vulncheck.com/advisories/csl-1010-m2m-3g-wifi-module-weak-encryption-via-router-cfg
• https://www.zeroscience.mk/#/advisories/ZSL-2026-6000

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