What’s Vulnerable › Vulnerabilities

CVE-2016-4521

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2016-05-31 · updated 2026-06-17
• Weakness: CWE-200

Description

Sixnet BT-5xxx and BT-6xxx M2M devices before 3.8.21 and 3.9.x before 3.9.8 have hardcoded credentials, which allows remote attackers to obtain access via unspecified vectors.

Affected products

• Sixnet Bt-5 Series Cellular Router Firmware: through 3.8.20; through 3.9.7
• Sixnet Bt-6 Series Cellular Router Firmware: through 3.8.20; through 3.9.7

References

• https://ics-cert.us-cert.gov/advisories/ICSA-16-147-02
• https://ics-cert.us-cert.gov/advisories/ICSA-16-147-02

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