CVE & CISA-KEV Catalog

CVE-2021-33478

MEDIUM
6.8
CVSS v3
NVD

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.

CWE-119Buffer Overflow

How to fix

Remediation Available
ip phone 8800 firmwareNVD
Affected:< 14.0(1)Fixed in:14.0(1)CVE-2021-33478derived from NVD
ip phone 8800 series with multiplatform firmwareNVD
Affected:< 11.3(4)Fixed in:11.3(4)CVE-2021-33478derived from NVD
ip phone 8811 firmwareNVD
Affected:< 14.0(1)Fixed in:14.0(1)CVE-2021-33478derived from NVD
ip phone 8811 with multiplatform firmwareNVD
Affected:< 11.3(4)Fixed in:11.3(4)CVE-2021-33478derived from NVD
ip phone 8841 firmwareNVD
Affected:< 14.0(1)Fixed in:14.0(1)CVE-2021-33478derived from NVD
ip phone 8841 with multiplatform firmwareNVD
Affected:< 11.3(4)Fixed in:11.3(4)CVE-2021-33478derived from NVD
ip phone 8845 firmwareNVD
Affected:< 14.0(1)Fixed in:14.0(1)CVE-2021-33478derived from NVD
ip phone 8845 with multiplatform firmwareNVD
Affected:< 11.3(4)Fixed in:11.3(4)CVE-2021-33478derived from NVD
ip phone 8851 firmwareNVD
Affected:< 14.0(1)Fixed in:14.0(1)CVE-2021-33478derived from NVD
ip phone 8851 with multiplatform firmwareNVD
Affected:< 11.3(4)Fixed in:11.3(4)CVE-2021-33478derived from NVD
ip phone 8861 firmwareNVD
Affected:< 14.0(1)Fixed in:14.0(1)CVE-2021-33478derived from NVD
ip phone 8861 with multiplatform firmwareNVD
Affected:< 11.3(4)Fixed in:11.3(4)CVE-2021-33478derived from NVD
ip phone 8865 firmwareNVD
Affected:< 14.0(1)Fixed in:14.0(1)CVE-2021-33478derived from NVD
ip phone 8865 with multiplatform firmwareNVD
Affected:< 11.3(4)Fixed in:11.3(4)CVE-2021-33478derived from NVD
wireless ip phone 8821 firmwareNVD
Affected:< 11.0(6)sr1Fixed in:11.0(6)sr1CVE-2021-33478derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorPhysical
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

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

Exploit Intelligence

0.30%probability of exploitation in 30 days
22ndpercentile

Low risk: more likely to be exploited than 22% of all known CVEs.

References

Vendor Advisory1

Related Vulnerabilities

Other CWE-119 (Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2023-4966Critical9.4100%KEV + RansomFix
CVE-2017-11882High7.8100%KEV + Ransom-
CVE-2020-0796Critical10.0100%KEV + Ransom-
CVE-2008-4250Critical9.899%KEV-
CVE-2017-15944Critical9.898%KEVFix
CVE-2015-0014High10.097%--
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.