How severe is CVE-2021-22420?

CVE-2021-22420 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-22420 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-22420?

CVE-2021-22420 affects Huawei Harmonyos. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-22420?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-22420 published?

CVE-2021-22420 was published on 2021-08-03 and last updated on 2026-06-17.

CVE-2021-22420

CVE-2021-22420 is a high-severity vulnerability in Huawei Harmonyos with a CVSS 3.x base score of 7.8. 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-668.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 7.2
EPSS exploit prediction: 0% (7th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-668
Affected product: Huawei Harmonyos
Published: 2021-08-03
Last modified: 2026-06-17

Description

A component of the HarmonyOS has a External Control of System or Configuration Setting vulnerability. Local attackers may exploit this vulnerability to cause the underlying trust of the application trustlist mechanism is missing..

Frequently asked questions

What is CVE-2021-22420?: A component of the HarmonyOS has a External Control of System or Configuration Setting vulnerability. Local attackers may exploit this vulnerability to cause the underlying trust of the application trustlist mechanism is missing..
How severe is CVE-2021-22420?: CVE-2021-22420 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-22420 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-22420?: CVE-2021-22420 affects Huawei Harmonyos. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-22420?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-22420 published?: CVE-2021-22420 was published on 2021-08-03 and last updated on 2026-06-17.

References

https://device.harmonyos.com/cn/docs/security/update/oem_security_update_phone_202106-0000001165452077

Affected products (1)

cpe:2.3:o:huawei:harmonyos:2.0:*:*:*:*:*:*:*

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