CVE-2021-33478

6.8 MEDIUM 0.3% exploit odds Fix listed

What it is

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.

At a glance

Exploitability: Can be exploited with physical access without logging in. High risk of data exposure, data tampering, service disruption.
Exploit odds: 0.3% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2021-07-22 17:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 03:54 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.3% in the next 30 days (EPSS).
Severity: 6.8 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2021-07-22 17:15 UTC
Last modified: 2026-06-17 03:54 UTC
Exploit probability: 0.3% · EPSS, next 30 days
Weakness: CWE-119 · Buffer errors
Record status: Modified

Affected

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\(4\)

Attack profile CVSS 3.1 · 6.8

Attack vector: Physical
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Raw vector

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-33478.md and follow it. Check whether this project is affected by CVE-2021-33478. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record