MediaTek MT7902/MT7920/MT7921/MT7922/MT7925/MT7927 WLAN STA driver toctou

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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2.4$0-$5k0.00

Summaryinfo

A vulnerability was found in MediaTek MT7902, MT7920, MT7921, MT7922, MT7925 and MT7927. It has been rated as problematic. The affected element is an unknown function of the component WLAN STA driver. This manipulation causes toctou. This vulnerability is handled as CVE-2025-20740. It is possible to launch the attack on the local host. There is not any exploit available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability has been found in MediaTek MT7902, MT7920, MT7921, MT7922, MT7925 and MT7927 and classified as problematic. Affected by this vulnerability is an unknown function of the component WLAN STA driver. The manipulation with an unknown input leads to a toctou vulnerability. The CWE definition for the vulnerability is CWE-367. The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the product to perform invalid actions when the resource is in an unexpected state. As an impact it is known to affect confidentiality. The summary by CVE is:

In wlan STA driver, there is a possible out of bounds read due to a race condition. This could lead to local information disclosure with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00435337; Issue ID: MSV-4036.

It is possible to read the advisory at corp.mediatek.com. This vulnerability is known as CVE-2025-20740 since 11/01/2024. The exploitation appears to be difficult. Attacking locally is a requirement. The technical details are unknown and an exploit is not publicly available.

Applying a patch is able to eliminate this problem.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2025-2939). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

  • Dell Computer

Productinfo

Type

Vendor

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 2.5
VulDB Meta Temp Score: 2.4

VulDB Base Score: 2.5
VulDB Temp Score: 2.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Toctou
CWE: CWE-367 / CWE-362
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: Patch
Status: 🔍

0-Day Time: 🔒

Timelineinfo

11/01/2024 CVE reserved
11/04/2025 +368 days Advisory disclosed
11/04/2025 +0 days VulDB entry created
01/02/2026 +58 days VulDB entry last update

Sourcesinfo

Advisory: corp.mediatek.com
Status: Confirmed

CVE: CVE-2025-20740 (🔒)
GCVE (CVE): GCVE-0-2025-20740
GCVE (VulDB): GCVE-100-331051
CERT Bund: WID-SEC-2025-2939 - Dell Computer: Mehrere Schwachstellen

Entryinfo

Created: 11/04/2025 07:54
Updated: 01/02/2026 00:20
Changes: 11/04/2025 07:54 (53), 01/02/2026 00:20 (7)
Complete: 🔍
Cache ID: 216::103

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

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