CVE-2021-37020

Severity: critical (CVSS 9.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-12-07 · updated 2026-06-17
Weakness: CWE-787

Description

There is a Stack-based Buffer Overflow vulnerability in Huawei Smartphone.Successful exploitation of this vulnerability may lead to Out-of-bounds read.

Affected products

Huawei EMUI: 9.1.0, 10.0.0, 10.1.0, 10.1.1, 11.0.0, 11.0.1
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://device.harmonyos.com/en/docs/security/update/security-bulletins-202109-0000001196270727
https://device.harmonyos.com/en/docs/security/update/security-bulletins-202109-0000001196270727

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