Insecure Default Variable Initialization in Insyde AhciBusDxe driver

Published: 2022-02-03
Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-41841
Exploitation vector Network
Public exploit N/A
Vulnerable software
Hardware solutions / Drivers


Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Insecure Default Variable Initialization

EUVDB-ID: #VU60266

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-41841

CWE-ID: CWE-453 - Insecure Default Variable Initialization

Exploit availability: No


The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to the SMM (System Management Mode) branch that registers a SWSMI handler does not sufficiently check or validate the allocated table variables EFI_BOOT_SERVICES and EFI_RUNTIME_SERVICES. A remote attacker can overwrite address location of the LocateHandleBuffer function and execute arbitrary code on the system.


Install updates from vendor's website.

Vulnerable software versions

AhciBusDxe: before 5.5: 05.51.29, 5.4: 05.43.29, 5.3: 05.35.29, 5.2: 05.26.29, 5.1: 05.16.29, 5.0: 05.08.29

CPE2.3 External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.