CVE: CVE-2021-33478

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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.

Threat-Mapped Scoring

Score: 1.8

Priority: P4 - Informational (Low)

S9 – Sabotage of System/App

EPSS

Score: 0.00133
Percentile: 0.33854

CVSS Scoring

CVSS v3.1 Score: 6.8

Severity: MEDIUM

Mapped CWE(s)

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

All CAPEC(s)

CAPEC-10: Buffer Overflow via Environment Variables
CAPEC-100: Overflow Buffers
CAPEC-123: Buffer Manipulation
CAPEC-14: Client-side Injection-induced Buffer Overflow
CAPEC-24: Filter Failure through Buffer Overflow
CAPEC-42: MIME Conversion
CAPEC-44: Overflow Binary Resource File
CAPEC-45: Buffer Overflow via Symbolic Links
CAPEC-46: Overflow Variables and Tags
CAPEC-47: Buffer Overflow via Parameter Expansion
CAPEC-8: Buffer Overflow in an API Call
CAPEC-9: Buffer Overflow in Local Command-Line Utilities

CAPEC(s) with Mapped TTPs

Mapped ATT&CK TTPs

Affected Products

cpe:2.3:o:cisco:ip_phone_8800_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ip_phone_8800_series_with_multiplatform_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ip_phone_8811_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ip_phone_8811_with_multiplatform_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ip_phone_8841_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ip_phone_8841_with_multiplatform_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ip_phone_8845_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ip_phone_8845_with_multiplatform_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ip_phone_8851_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ip_phone_8851_with_multiplatform_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ip_phone_8861_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ip_phone_8861_with_multiplatform_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ip_phone_8865_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ip_phone_8865_with_multiplatform_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:wireless_ip_phone_8821_firmware:*:*:*:*:*:*:*:*

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