How severe is CVE-2025-8351?

CVE-2025-8351 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-8351 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-8351?

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.

Does CVE-2025-8351 have an EU (EUVD) identifier?

Yes. CVE-2025-8351 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-200023.

When was CVE-2025-8351 published?

CVE-2025-8351 was published on 2025-12-01 and last updated on 2026-06-17.

CVE-2025-8351

CVE-2025-8351 is a high-severity vulnerability 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-122.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-200023
Weakness: CWE-122
Published: 2025-12-01
Last modified: 2026-06-17

Description

Heap-based Buffer Overflow, Out-of-bounds Read vulnerability in Avira Antivirus engine when scanning a malformed file may allow Local Execution of Code or Denial-of-Service of the antivirus engine process. This issue affects Avira Antivirus on Windows, macOS, and Linux for engine builds before 8.3.70.98.

Frequently asked questions

What is CVE-2025-8351?: Heap-based Buffer Overflow, Out-of-bounds Read vulnerability in Avira Antivirus engine when scanning a malformed file may allow Local Execution of Code or Denial-of-Service of the antivirus engine process. This issue affects Avira Antivirus on Windows, macOS, and Linux for engine builds before 8.3.70.98.
How severe is CVE-2025-8351?: CVE-2025-8351 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-8351 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-8351?: 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.
Does CVE-2025-8351 have an EU (EUVD) identifier?: Yes. CVE-2025-8351 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-200023.
When was CVE-2025-8351 published?: CVE-2025-8351 was published on 2025-12-01 and last updated on 2026-06-17.

References

https://www.gendigital.com/us/en/contact-us/security-advisories/

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