What’s Vulnerable › Vulnerabilities

CVE-2025-3461: ON Semiconductor Quantenna Telnet Missing Authentication

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-06-08 · updated 2026-06-17
• Weakness: CWE-306

Description

The Quantenna Wi-Fi chips ship with an unauthenticated telnet interface by default. This is an instance of CWE-306, "Missing Authentication for Critical Function," and is estimated as a CVSS 9.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N). This issue affects Quantenna Wi-Fi chipset through version 8.0.0.28 of the latest SDK, and appears to be unpatched at the time of this CVE record's first publishing, though the vendor has released a best practices guide for implementors of this chipset.

Affected products

• Onsemi Qcs-Ax2-A12 Firmware: all versions
• Onsemi Qcs-Ax2-S5 Firmware: all versions
• Onsemi Qcs-Ax2-T12 Firmware: all versions
• Onsemi Qcs-Ax2-T8 Firmware: all versions
• Onsemi Qcs-Ax3-A12 Firmware: all versions
• Onsemi Qcs-Ax3-S5 Firmware: all versions
• Onsemi Qcs-Ax3-T12 Firmware: all versions
• Onsemi Qcs-Ax3-T8 Firmware: all versions
• Onsemi Qd840 Firmware: all versions
• Onsemi Qhs710 Firmware: all versions
• Onsemi Qsr10Ga Firmware: all versions
• Onsemi Qsr10Gu Firmware: all versions
• Onsemi Qv840 Firmware: all versions
• Onsemi Qv840C Firmware: all versions
• Onsemi Qv860 Firmware: all versions
• Onsemi Qv940 Firmware: all versions
• Onsemi Qv942C Firmware: all versions
• Onsemi Qv952C Firmware: all versions

References

• https://community.onsemi.com/s/article/QCS-Quantenna-Wi-Fi-product-support-and-security-best-practices
• https://takeonme.org/cves/cve-2025-3461/

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