Vulnerability Description
The TrustZone implementation in certain Broadcom MediaxChange firmware could allow an unauthenticated, physically proximate attacker to achieve arbitrary code execution in the TrustZone Trusted Execution Environment (TEE) of an affected device. This, for example, affects certain Cisco IP Phone and Wireless IP Phone products before 2021-07-07. Exploitation is possible only when the attacker can disassemble the device in order to control the voltage/current for chip pins.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Ip Phone 8800 Firmware | < 14.0\(1\) |
| Cisco | Ip Phone 8800 Series With Multiplatform Firmware | < 11.3\(4\) |
| Cisco | Ip Phone 8811 Firmware | < 14.0\(1\) |
| Cisco | Ip Phone 8811 With Multiplatform Firmware | < 11.3\(4\) |
| Cisco | Ip Phone 8841 Firmware | < 14.0\(1\) |
| Cisco | Ip Phone 8841 With Multiplatform Firmware | < 11.3\(4\) |
| Cisco | Ip Phone 8845 Firmware | < 14.0\(1\) |
| Cisco | Ip Phone 8845 With Multiplatform Firmware | < 11.3\(4\) |
| Cisco | Ip Phone 8851 Firmware | < 14.0\(1\) |
| Cisco | Ip Phone 8851 With Multiplatform Firmware | < 11.3\(4\) |
| Cisco | Ip Phone 8861 Firmware | < 14.0\(1\) |
| Cisco | Ip Phone 8861 With Multiplatform Firmware | < 11.3\(4\) |
| Cisco | Ip Phone 8865 Firmware | < 14.0\(1\) |
| Cisco | Ip Phone 8865 With Multiplatform Firmware | < 11.3\(4\) |
| Cisco | Wireless Ip Phone 8821 Firmware | < 11.0\(6\)sr1 |
Related Weaknesses (CWE)
References
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bVendor Advisory
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bVendor Advisory
FAQ
What is CVE-2021-33478?
CVE-2021-33478 is a vulnerability with a CVSS score of 6.8 (MEDIUM). The TrustZone implementation in certain Broadcom MediaxChange firmware could allow an unauthenticated, physically proximate attacker to achieve arbitrary code execution in the TrustZone Trusted Execut...
How severe is CVE-2021-33478?
CVE-2021-33478 has been rated MEDIUM with a CVSS base score of 6.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-33478?
Check the references section above for vendor advisories and patch information. Affected products include: Cisco Ip Phone 8800 Firmware, Cisco Ip Phone 8800 Series With Multiplatform Firmware, Cisco Ip Phone 8811 Firmware, Cisco Ip Phone 8811 With Multiplatform Firmware, Cisco Ip Phone 8841 Firmware.