{"cve":"CVE-2021-33478","nvd":{"published":"2021-07-22T17:15:09.510","modified":"2026-06-17T03:54:37.043","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":6.8},"cwes":["CWE-119"],"references":["https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-brcm-mxc-jul2021-26LqUZUh","https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-brcm-mxc-jul2021-26LqUZUh"],"products":["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","cisco:ip_phone_8841_with_multiplatform_firmware","cisco:ip_phone_8845_firmware","cisco:ip_phone_8845_with_multiplatform_firmware","cisco:ip_phone_8851_firmware","cisco:ip_phone_8851_with_multiplatform_firmware","cisco:ip_phone_8861_firmware","cisco:ip_phone_8861_with_multiplatform_firmware","cisco:ip_phone_8865_firmware","cisco:ip_phone_8865_with_multiplatform_firmware","cisco:wireless_ip_phone_8821_firmware"],"source":"nvd","synced_at":"2026-10-19T21:21:13.713336758+00:00"},"epss":{"cve":"CVE-2021-33478","score":0.00304,"percentile":0.23192,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}