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June 25, 2021 |

Vulnerabilities in BIOSConnect feature of Dell SupportAssist

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Researchers discovered four vulnerabilities in the BIOSConnect feature of Dell SupportAssist. When chained together, the flaws could enable arbitrary code execution at the BIOS/Unified Extensible Firmware Interface (UEFI) level. Timely patching is recommended.


  • On 24 June 2021, Dell issued an advisory with technical details and remediation steps for the flaws.
  • The first vulnerability, tracked as CVE-2021-21571, could be leveraged as the first step in an attack chain to remotely deliver malicious content to a victim.
  • The root cause is a TLS connection from BIOSConnect accepting any valid wildcard certificate.
  • The other three are buffer overflow vulnerabilities (CVE-2021-21572, CVE-2021-21573, CVE-2021-21574); threat actors could use these as the second step to arbitrarily execute code at the BIOS/UEFI level.
  • Dell has released most of the patches on June 24, 2021, with other updates scheduled for July.


  • If you are using the vulnerable products, we recommend applying BIOS updates by following the Dell advisory.
  • If you are unable to apply BIOS updates now, we recommend following the mitigation steps in Dell’s advisory to reduce the risk of exploitation.