VDB-189731 · CVE-2021-45971 · GCVE-0-2021-45971

InsydeH2O up to 05.51.24 SWSMI SdHostDriver CommBufferData buffer overflow

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.7	$0-$5k	0.00

Summaryinfo

A vulnerability has been found in InsydeH2O up to 05.16.24/05.26.24/05.35.24/05.43.24/05.51.24 and classified as critical. This vulnerability affects the function SdHostDriver of the component SWSMI Handler. The manipulation of the argument CommBufferData leads to buffer overflow. This vulnerability is documented as CVE-2021-45971. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as critical, has been found in InsydeH2O up to 05.16.24/05.26.24/05.35.24/05.43.24/05.51.24. This issue affects the function SdHostDriver of the component SWSMI Handler. The manipulation of the argument CommBufferData with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability.

The weakness was released 01/06/2022. It is possible to read the advisory at insyde.com. The identification of this vulnerability is CVE-2021-45971 since 01/01/2022. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 05.16.25, 05.26.25, 05.35.25, 05.43.25 or 05.51.25 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

InsydeH2O

Version

License

commercial

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.7

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.2
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: InsydeH2O 05.16.25/05.26.25/05.35.25/05.43.25/05.51.25

Timelineinfo

01/01/2022 🔍
01/06/2022 +5 days 🔍
01/06/2022 +0 days 🔍
11/04/2025 +1398 days 🔍

Sourcesinfo

Advisory: insyde.com
Status: Confirmed

CVE: CVE-2021-45971 (🔍)
GCVE (CVE): GCVE-0-2021-45971
GCVE (VulDB): GCVE-100-189731

Entryinfo

Created: 01/06/2022 07:11
Updated: 11/04/2025 22:58
Changes: 01/06/2022 07:11 (40), 01/09/2022 09:23 (1), 11/04/2025 22:58 (33)
Complete: 🔍
Cache ID: 216::103