CVE-2021-33478

Severity Score

6.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

La implementación de TrustZone en determinados firmware de Broadcom MediaxChange, podría permitir a un atacante no autenticado y físicamente próximo lograr la ejecución de código arbitrario en el TrustZone Trusted Execution Environment (TEE) de un dispositivo afectado. Esto, por ejemplo, afecta a determinados productos Cisco IP Phone y Wireless IP Phone anteriores a 2021-07-07. Una explotación es posible sólo cuando el atacante puede desarmar el dispositivo para controlar el voltaje y corriente de los pines del chip

*Credits: N/A

Attack Vector

Physical

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-05-20 CVE Reserved
2021-07-22 CVE Published
2024-06-27 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-brcm-mxc-jul2021-26LqUZUh	2021-08-02

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Cisco Search vendor "Cisco"		Ip Phone 8800 Firmware Search vendor "Cisco" for product "Ip Phone 8800 Firmware"				< 14.0\(1\) Search vendor "Cisco" for product "Ip Phone 8800 Firmware" and version " < 14.0\(1\)"		-		Affected
Cisco Search vendor "Cisco"		Ip Phone 8800 Series With Multiplatform Firmware Search vendor "Cisco" for product "Ip Phone 8800 Series With Multiplatform Firmware"				< 11.3\(4\) Search vendor "Cisco" for product "Ip Phone 8800 Series With Multiplatform Firmware" and version " < 11.3\(4\)"		-		Affected
Cisco Search vendor "Cisco"		Ip Phone 8811 Firmware Search vendor "Cisco" for product "Ip Phone 8811 Firmware"				< 14.0\(1\) Search vendor "Cisco" for product "Ip Phone 8811 Firmware" and version " < 14.0\(1\)"		-		Affected
Cisco Search vendor "Cisco"		Ip Phone 8811 With Multiplatform Firmware Search vendor "Cisco" for product "Ip Phone 8811 With Multiplatform Firmware"				< 11.3\(4\) Search vendor "Cisco" for product "Ip Phone 8811 With Multiplatform Firmware" and version " < 11.3\(4\)"		-		Affected
Cisco Search vendor "Cisco"		Ip Phone 8841 Firmware Search vendor "Cisco" for product "Ip Phone 8841 Firmware"				< 14.0\(1\) Search vendor "Cisco" for product "Ip Phone 8841 Firmware" and version " < 14.0\(1\)"		-		Affected
Cisco Search vendor "Cisco"		Ip Phone 8841 With Multiplatform Firmware Search vendor "Cisco" for product "Ip Phone 8841 With Multiplatform Firmware"				< 11.3\(4\) Search vendor "Cisco" for product "Ip Phone 8841 With Multiplatform Firmware" and version " < 11.3\(4\)"		-		Affected
Cisco Search vendor "Cisco"		Ip Phone 8845 Firmware Search vendor "Cisco" for product "Ip Phone 8845 Firmware"				< 14.0\(1\) Search vendor "Cisco" for product "Ip Phone 8845 Firmware" and version " < 14.0\(1\)"		-		Affected
Cisco Search vendor "Cisco"		Ip Phone 8845 With Multiplatform Firmware Search vendor "Cisco" for product "Ip Phone 8845 With Multiplatform Firmware"				< 11.3\(4\) Search vendor "Cisco" for product "Ip Phone 8845 With Multiplatform Firmware" and version " < 11.3\(4\)"		-		Affected
Cisco Search vendor "Cisco"		Ip Phone 8851 Firmware Search vendor "Cisco" for product "Ip Phone 8851 Firmware"				< 14.0\(1\) Search vendor "Cisco" for product "Ip Phone 8851 Firmware" and version " < 14.0\(1\)"		-		Affected
Cisco Search vendor "Cisco"		Ip Phone 8851 With Multiplatform Firmware Search vendor "Cisco" for product "Ip Phone 8851 With Multiplatform Firmware"				< 11.3\(4\) Search vendor "Cisco" for product "Ip Phone 8851 With Multiplatform Firmware" and version " < 11.3\(4\)"		-		Affected
Cisco Search vendor "Cisco"		Ip Phone 8861 Firmware Search vendor "Cisco" for product "Ip Phone 8861 Firmware"				< 14.0\(1\) Search vendor "Cisco" for product "Ip Phone 8861 Firmware" and version " < 14.0\(1\)"		-		Affected
Cisco Search vendor "Cisco"		Ip Phone 8861 With Multiplatform Firmware Search vendor "Cisco" for product "Ip Phone 8861 With Multiplatform Firmware"				< 11.3\(4\) Search vendor "Cisco" for product "Ip Phone 8861 With Multiplatform Firmware" and version " < 11.3\(4\)"		-		Affected
Cisco Search vendor "Cisco"		Ip Phone 8865 Firmware Search vendor "Cisco" for product "Ip Phone 8865 Firmware"				< 14.0\(1\) Search vendor "Cisco" for product "Ip Phone 8865 Firmware" and version " < 14.0\(1\)"		-		Affected
Cisco Search vendor "Cisco"		Ip Phone 8865 With Multiplatform Firmware Search vendor "Cisco" for product "Ip Phone 8865 With Multiplatform Firmware"				< 11.3\(4\) Search vendor "Cisco" for product "Ip Phone 8865 With Multiplatform Firmware" and version " < 11.3\(4\)"		-		Affected
Cisco Search vendor "Cisco"		Wireless Ip Phone 8821 Firmware Search vendor "Cisco" for product "Wireless Ip Phone 8821 Firmware"				< 11.0\(6\)sr1 Search vendor "Cisco" for product "Wireless Ip Phone 8821 Firmware" and version " < 11.0\(6\)sr1"		-		Affected