CVE-2021-33478
6.8 · MEDIUMOverview
CVE-2021-33478 is a medium-severity vulnerability affecting cisco ip_phone_8800_firmware. It was published on July 22, 2021 and has a CVSS 3.1 base score of 6.8 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 6.8, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from cisco. Update ip_phone_8800_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| cisco | ip_phone_8800_firmware | >= 0, < 14.0\(1\) | Affected |
| cisco | ip_phone_8800_series_with_multiplatform_firmware | >= 0, < 11.3\(4\) | Affected |
| cisco | ip_phone_8811_firmware | >= 0, < 14.0\(1\) | Affected |
| cisco | ip_phone_8811_with_multiplatform_firmware | >= 0, < 11.3\(4\) | Affected |
| cisco | ip_phone_8841_firmware | >= 0, < 14.0\(1\) | Affected |
| cisco | ip_phone_8841_with_multiplatform_firmware | >= 0, < 11.3\(4\) | Affected |
| cisco | ip_phone_8845_firmware | >= 0, < 14.0\(1\) | Affected |
| cisco | ip_phone_8845_with_multiplatform_firmware | >= 0, < 11.3\(4\) | Affected |
| cisco | ip_phone_8851_firmware | >= 0, < 14.0\(1\) | Affected |
| cisco | ip_phone_8851_with_multiplatform_firmware | >= 0, < 11.3\(4\) | Affected |
| cisco | ip_phone_8861_firmware | >= 0, < 14.0\(1\) | Affected |
| cisco | ip_phone_8861_with_multiplatform_firmware | >= 0, < 11.3\(4\) | Affected |
| cisco | ip_phone_8865_firmware | >= 0, < 14.0\(1\) | Affected |
| cisco | ip_phone_8865_with_multiplatform_firmware | >= 0, < 11.3\(4\) | Affected |
| cisco | wireless_ip_phone_8821_firmware | >= 0, < 11.0\(6\)sr1 | Affected |
Frequently Asked Questions
What is CVE-2021-33478?
CVE-2021-33478 is a medium-severity vulnerability affecting cisco ip_phone_8800_firmware. It was published on July 22, 2021 and has a CVSS 3.1 base score of 6.8 (MEDIUM).
How severe is CVE-2021-33478?
This vulnerability has a CVSS 3.1 base score of 6.8, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-33478?
Check the references section for vendor advisories and patches from cisco. Update ip_phone_8800_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-33478?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-33478 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
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