What is the CVSS score of CVE-2021-33478?

CVE-2021-33478 has a CVSS 3.1 base score of 6.8 (Medium). CVSS vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.3%.

Ip Phone 8800 Firmware CVE-2021-33478

MEDIUM

Buffer Overflow (CWE-119)

2021-07-22 cve@mitre.org

Buffer Overflow Cisco RCE Broadcom Ip Phone 8800 Firmware Ip Phone 8800 Series With Multiplatform Firmware Ip Phone 8811 Firmware Ip Phone 8811 With Multiplatform Firmware Ip Phone 8841 Firmware Ip Phone 8841 With Multiplatform Firmware Ip Phone 8845 Firmware Ip Phone 8845 With Multiplatform Firmware Ip Phone 8851 Firmware Ip Phone 8851 With Multiplatform Firmware Ip Phone 8861 Firmware Ip Phone 8861 With Multiplatform Firmware Ip Phone 8865 Firmware Ip Phone 8865 With Multiplatform Firmware Wireless Ip Phone 8821 Firmware

6.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

6.8 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Physical

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

CVE Published

Jul 22, 2021 - 17:15 nvd

MEDIUM 6.8

DescriptionNVD

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.

AnalysisAI

The TrustZone implementation in certain Broadcom MediaxChange firmware could allow an unauthenticated, physically proximate attacker to achieve arbitrary code execution in the TrustZone Trusted. Rated medium severity (CVSS 6.8), this vulnerability is no authentication required, low attack complexity. No vendor patch available.

Technical ContextAI

This vulnerability is classified as Buffer Overflow (CWE-119), which allows attackers to corrupt memory to execute arbitrary code or crash the application. 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 products include: Cisco Ip Phone 8800 Firmware, Cisco Ip Phone 8800 Series With Multiplatform Firmware, Cisco Ip Phone 8811 Firmware, Cisco Ip Phone 8811 With Multiplatform Firmware, Cisco Ip Phone 8841 Firmware. Version information: before 2021.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Use memory-safe languages or bounds-checking. Enable ASLR, DEP/NX, stack canaries. Use safe string functions.