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.

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Fixes

Solution

Upgrade to Avira scan engine build 8.3.70.98 or any later engine release. Builds at or above 8.3.70.98 include the fix.


Workaround

No workaround given by the vendor.

History

Fri, 12 Jun 2026 23:00:00 +0000

Type Values Removed Values Added
Description Heap-based Buffer Overflow, Out-of-bounds Read vulnerability in Avast Antivirus on MacOS when scanning a malformed file may allow Local Execution of Code or Denial-of-Service of the anitvirus engine process.This issue affects Antivirus: from 8.3.70.94 before 8.3.70.98. 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.
Title Scanning a malformed file in Avast Antivirus 8.3.70.94 on MacOS may result in remote code execution Avira antivirus engine heap buffer OOB read when scanning a malformed file
Metrics cvssV3_1

{'score': 9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H'}

cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}


Mon, 01 Dec 2025 21:30:00 +0000

Type Values Removed Values Added
First Time appeared Apple
Apple macos
Avast
Avast antivirus
Vendors & Products Apple
Apple macos
Avast
Avast antivirus

Mon, 01 Dec 2025 16:15:00 +0000

Type Values Removed Values Added
Title Scanning a malformed file in Avast Antivirus 8.3.70.94 on MacOS may result in remote code execution
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 01 Dec 2025 16:00:00 +0000

Type Values Removed Values Added
Description Heap-based Buffer Overflow, Out-of-bounds Read vulnerability in Avast Antivirus on MacOS when scanning a malformed file may allow Local Execution of Code or Denial-of-Service of the anitvirus engine process.This issue affects Antivirus: from 8.3.70.94 before 8.3.70.98.
Weaknesses CWE-122
CWE-125
References
Metrics cvssV3_1

{'score': 9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: NLOK

Published:

Updated: 2026-06-12T22:32:51.689Z

Reserved: 2025-07-30T11:48:44.820Z

Link: CVE-2025-8351

cve-icon Vulnrichment

Updated: 2025-12-01T15:58:22.538Z

cve-icon NVD

Status : Deferred

Published: 2025-12-01T16:15:57.857

Modified: 2026-06-12T23:16:28.253

Link: CVE-2025-8351

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-12-01T21:27:19Z

Weaknesses