CVE-2025-7009: Avast antivirus heap buffer OOB read when scanning a malformed PE file
Heap buffer out-of-bounds read vulnerability in Avast Antivirus when scanning a malformed Windows PE file may allow Local Execution of Code or Denial-of-Service of the antivirus process.
This issue affects Avast Antivirus, AVG Antivirus, Norton Antivirus, Avast One, and Avast Business Antivirus on Windows, macOS, and Linux for virus definition builds before VPS 25021310.
The affected scanning logic is delivered through a shared Gen Digital virus definition update stream. The same stream feeds the consumer antivirus products listed in this advisory and other Gen Digital products that embed the same engine. Mitigation flows through this update channel; installations at or above the listed build are not vulnerable regardless of which product consumes the stream.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Gen Digital virus definition update streamto a version that resolves this vulnerability.Patch VPS 25021310 - Configuration
Enable automatic virus-definition updates for the listed products so they receive VPS 25021310 or later definitions as they become available.
Avast Antivirus, AVG Antivirus, Norton Antivirus, Avast One, Avast Business Antivirus (products consuming Gen Digital virus definition stream) automatic_virus_definition_updates = enabled - Operational
Verify installed virus definitions are at build VPS 25021310 or later; if not, update the virus definitions immediately to VPS 25021310 or a later build.
Event History
Frequently Asked Questions
What is the severity of CVE-2025-7009?
The severity of CVE-2025-7009 is high, rated at 7.8 on the CVSS scale.
What products are affected by CVE-2025-7009?
CVE-2025-7009 affects Avast Antivirus, AVG Antivirus, Norton Antivirus, Avast One, and Avast Business Antivirus.
How do I fix CVE-2025-7009?
To fix CVE-2025-7009, install virus definitions VPS 25021310 or any later updates.
What kind of vulnerability is CVE-2025-7009?
CVE-2025-7009 is a heap buffer out-of-bounds read vulnerability.
What can happen if CVE-2025-7009 is exploited?
Exploitation of CVE-2025-7009 could allow local execution of code or cause denial-of-service for the antivirus process.