Is CVE-2021-46887 actively exploited?

No active exploitation of CVE-2021-46887 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-46887 be exploited remotely?

Yes. CVE-2021-46887 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-46887?

CVE-2021-46887 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2021-46887

NVD-CWE-OtherPublished: May 26, 2023· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

Lack of length check vulnerability in the HW_KEYMASTER module. Successful exploitation of this vulnerability may cause out-of-bounds read.

NVD Source

Risk Analysis

A length check vulnerability in the HW_KEYMASTER module of Huawei EMUI allows for out-of-bounds memory reads. This critical flaw is rated 9.8, indicating a high risk of remote exploitation.

No public exploit is known, and it is not in the KEV catalog. It is remotely exploitable with low complexity.

Recommended Action

Update affected Huawei EMUI devices to the latest available firmware versions.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2021-46887 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.