What’s Vulnerable › Vulnerabilities

CVE-2021-39996

• Severity: critical (CVSS 9.8 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: 2022-01-10 · updated 2026-06-17
• Weakness: CWE-787

Description

There is a Heap-based buffer overflow vulnerability with the NFC module in smartphones. Successful exploitation of this vulnerability may cause memory overflow.

Affected products

• Huawei EMUI: 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://consumer.huawei.com/en/support/bulletin/2021/12/
• https://device.harmonyos.com/en/docs/security/update/security-bulletins-202112-0000001183296718
• https://consumer.huawei.com/en/support/bulletin/2021/12/
• https://device.harmonyos.com/en/docs/security/update/security-bulletins-202112-0000001183296718

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