CVE-2021-40037

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-01-10 · updated 2026-06-17
Weakness: CWE-843

Description

There is a Vulnerability of accessing resources using an incompatible type (type confusion) in the MPTCP subsystem in smartphones. Successful exploitation of this vulnerability may cause the system to crash and restart.

Affected products

Huawei EMUI: 10.0.0, 10.1.0, 10.1.1, 11.0.0, 11.0.1, 12.0.0
Huawei HarmonyOS: before 2.0 — fixed in 2.0
Huawei Magic UI: 3.0.0, 3.1.0, 3.1.1, 4.0.0

How to fix

Upgrade to a fixed version: Huawei HarmonyOS 2.0. Check the vendor advisory for mitigations.

References

https://consumer.huawei.com/en/support/bulletin/2022/1/
https://device.harmonyos.com/en/docs/security/update/security-bulletins-202201-0000001238736331
https://consumer.huawei.com/en/support/bulletin/2022/1/
https://device.harmonyos.com/en/docs/security/update/security-bulletins-202201-0000001238736331

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