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CVE-2021-33478

MEDIUM
6.8
CVSS Score
Published: July 22, 2021 at 04:53 PM UTC
Updated: June 17, 2026 at 03:54 AM UTC
16 products affected across 1 vendorIP Phone 8861 FirmwareIP Phone 8865 FirmwareIP Phone 8811 Firmware

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Severity
MEDIUM6.8
Exploit prediction
EPSS 0.3%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

IP Phone 8800 Firmware· Cisco
95%
v < 14.0(1)
Affected range stops below 14.0(1), so it looks safe — our inference, not a vendor statement
IP Phone 8800 Series with Multiplatform Firmware· Cisco
95%
v < 11.3(4)
Affected range stops below 11.3(4), so it looks safe — our inference, not a vendor statement
IP Phone 8811 Firmware· Cisco
95%
v < 14.0(1)
Affected range stops below 14.0(1), so it looks safe — our inference, not a vendor statement
IP Phone 8811 with Multiplatform Firmware· Cisco
95%
v < 11.3(4)
Affected range stops below 11.3(4), so it looks safe — our inference, not a vendor statement
IP Phone 8841 Firmware· Cisco
95%
v < 14.0(1)
Affected range stops below 14.0(1), so it looks safe — our inference, not a vendor statement
IP Phone 8841 with Multiplatform Firmware· Cisco
95%
v < 11.3(4)
Affected range stops below 11.3(4), so it looks safe — our inference, not a vendor statement
IP Phone 8845 Firmware· Cisco
95%
v < 14.0(1)
Affected range stops below 14.0(1), so it looks safe — our inference, not a vendor statement
IP Phone 8845 with Multiplatform Firmware· Cisco
95%
v < 11.3(4)
Affected range stops below 11.3(4), so it looks safe — our inference, not a vendor statement
IP Phone 8851 Firmware· Cisco
95%
v < 14.0(1)
Affected range stops below 14.0(1), so it looks safe — our inference, not a vendor statement
IP Phone 8851 with Multiplatform Firmware· Cisco
95%
v < 11.3(4)
Affected range stops below 11.3(4), so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

x_refsource_MISCVendor Advisory
Source: [email protected]
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-brcm-mxc-jul2021-26LqUZUh

CVSS

6.8MEDIUM[email protected]
Attack Vector
PHYSICAL
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-119

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