How severe is CVE-2025-66331?

CVE-2025-66331 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2025-66331 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-66331?

CVE-2025-66331 primarily affects Huawei Harmonyos. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-66331?

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

Does CVE-2025-66331 have an EU (EUVD) identifier?

Yes. CVE-2025-66331 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201676.

When was CVE-2025-66331 published?

CVE-2025-66331 was published on 2025-12-08 and last updated on 2026-06-17.

CVE-2025-66331

CVE-2025-66331 is a low-severity vulnerability in Huawei Harmonyos with a CVSS 3.x base score of 3.3. 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-494.

Key facts

Severity: Low (CVSS 3.x base score 3.3)
EPSS exploit prediction: 0% (1st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-201676
Weakness: CWE-494
Affected product: Huawei Harmonyos
Published: 2025-12-08
Last modified: 2026-06-17

Description

Denial of service (DoS) vulnerability in the office service. Impact: Successful exploitation of this vulnerability may affect availability.

Frequently asked questions

What is CVE-2025-66331?: Denial of service (DoS) vulnerability in the office service. Impact: Successful exploitation of this vulnerability may affect availability.
How severe is CVE-2025-66331?: CVE-2025-66331 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2025-66331 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-66331?: CVE-2025-66331 primarily affects Huawei Harmonyos. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-66331?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-66331 have an EU (EUVD) identifier?: Yes. CVE-2025-66331 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201676.
When was CVE-2025-66331 published?: CVE-2025-66331 was published on 2025-12-08 and last updated on 2026-06-17.

References

https://consumer.huawei.com/en/support/bulletin/2025/12/

Affected products (3)

cpe:2.3:o:huawei:harmonyos:5.0.1:*:*:*:*:*:*:*
cpe:2.3:o:huawei:harmonyos:5.1.0:*:*:*:*:*:*:*
cpe:2.3:o:huawei:harmonyos:6.0.0:*:*:*:*:*:*:*

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