Insyde H2O up to 05.71.20 Tcg2Smm input validation

CVSS Meta Temp Score
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CTI Interest Score
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6.8$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Insyde H2O up to 05.71.20. Affected by this issue is the function Tcg2Smm. The manipulation leads to input validation. This vulnerability is traded as CVE-2025-4277. An attack has to be approached locally. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Insyde H2O up to 05.71.20. It has been rated as critical. This issue affects the function Tcg2Smm. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Tcg2Smm has a vulnerability which can be used to write arbitrary memory inside SMRAM and execute arbitrary code at SMM level.

It is possible to read the advisory at insyde.com. The identification of this vulnerability is CVE-2025-4277 since 05/05/2025. The exploitation is known to be difficult. Attacking locally is a requirement. Additional levels of successful authentication are needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 05.2A.21, 05.39.21, 05.47.21, 05.55.21, 05.62.21 or 05.71.21 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-24532). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.9
VulDB Meta Temp Score: 6.8

VulDB Base Score: 6.4
VulDB Temp Score: 6.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (Insyde): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: H2O 05.2A.21/05.39.21/05.47.21/05.55.21/05.62.21/05.71.21

Timelineinfo

05/05/2025 CVE reserved
08/13/2025 +100 days Advisory disclosed
08/13/2025 +0 days VulDB entry created
08/13/2025 +0 days VulDB entry last update

Sourcesinfo

Advisory: insyde.com
Status: Confirmed

CVE: CVE-2025-4277 (🔒)
GCVE (CVE): GCVE-0-2025-4277
GCVE (VulDB): GCVE-100-319859
EUVD: 🔒

Entryinfo

Created: 08/13/2025 07:30
Updated: 08/13/2025 16:42
Changes: 08/13/2025 07:30 (63), 08/13/2025 16:42 (1)
Complete: 🔍
Cache ID: 216::103

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

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