MediaTek MT6890/MT7615/MT7915/MT7916/MT7981/MT7986 wlan heap-based overflow

CVSS Meta Temp Score
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CTI Interest Score
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6.0$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in MediaTek MT6890, MT7615, MT7915, MT7916, MT7981 and MT7986. This issue affects some unknown processing of the component wlan. This manipulation causes heap-based overflow. The identification of this vulnerability is CVE-2026-20408. The attack needs to be done within the local network. There is no exploit available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability was found in MediaTek MT6890, MT7615, MT7915, MT7916, MT7981 and MT7986. It has been declared as critical. Affected by this vulnerability is some unknown processing of the component wlan. The manipulation with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In wlan, there is a possible out of bounds write due to a heap buffer overflow. This could lead to remote (proximal/adjacent) escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00461651; Issue ID: MSV-4758.

It is possible to read the advisory at corp.mediatek.com. This vulnerability is known as CVE-2026-20408 since 11/03/2025. The exploitation appears to be easy. Access to the local network is required for this attack to succeed. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

Applying a patch is able to eliminate this problem.

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

Productinfo

Type

Vendor

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Heap-based overflow
CWE: CWE-122 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

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

11/03/2025 CVE reserved
02/02/2026 +91 days Advisory disclosed
02/02/2026 +0 days VulDB entry created
02/04/2026 +2 days VulDB entry last update

Sourcesinfo

Advisory: corp.mediatek.com
Status: Confirmed

CVE: CVE-2026-20408 (🔒)
GCVE (CVE): GCVE-0-2026-20408
GCVE (VulDB): GCVE-100-343699

Entryinfo

Created: 02/02/2026 10:19
Updated: 02/04/2026 16:34
Changes: 02/02/2026 10:19 (54), 02/04/2026 16:34 (1)
Complete: 🔍
Cache ID: 216::103

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