How severe is CVE-2021-40009?

CVE-2021-40009 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2021-40009 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-40009?

CVE-2021-40009 primarily affects Huawei Harmonyos. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-40009?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-40009 published?

CVE-2021-40009 was published on 2022-01-10 and last updated on 2026-06-17.

CVE-2021-40009

CVE-2021-40009 is a medium-severity vulnerability in Huawei Harmonyos with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Huawei Harmonyos
Published: 2022-01-10
Last modified: 2026-06-17

Description

There is an Out-of-bounds write vulnerability in the AOD module in smartphones. Successful exploitation of this vulnerability may affect service integrity.

Frequently asked questions

What is CVE-2021-40009?: There is an Out-of-bounds write vulnerability in the AOD module in smartphones. Successful exploitation of this vulnerability may affect service integrity.
How severe is CVE-2021-40009?: CVE-2021-40009 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2021-40009 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40009?: CVE-2021-40009 primarily affects Huawei Harmonyos. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-40009?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-40009 published?: CVE-2021-40009 was published on 2022-01-10 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:o:huawei:harmonyos:*:*:*:*:*:*:*:*
cpe:2.3:o:huawei:emui:11.0.0:*:*:*:*:*:*:*
cpe:2.3:o:huawei:emui:12.0.0:*:*:*:*:*:*:*
cpe:2.3:o:huawei:magic_ui:4.0.0:*:*:*:*:*:*:*

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