Gen Digital Avast Antivirus up to 25040308 on Windows PE File out-of-bounds write

Summaryinfo

A vulnerability was found in Gen Digital Avast Antivirus, AVG Antivirus, Norton Antivirus, Avast One and Avast Business Antivirus up to 25040308 on Windows. It has been rated as critical. The affected element is an unknown function of the component PE File Handler. This manipulation causes out-of-bounds write. This vulnerability appears as CVE-2025-7004. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical was found in Gen Digital Avast Antivirus, AVG Antivirus, Norton Antivirus, Avast One and Avast Business Antivirus up to 25040308 on Windows. Affected by this vulnerability is an unknown function of the component PE File Handler. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Heap buffer out-of-bounds write 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 25040308. 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.

It is possible to read the advisory at gendigital.com. This vulnerability is known as CVE-2025-7004 since 07/02/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available.

Upgrading eliminates this vulnerability. Applying the patch 25040308 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-210124). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Anti-Malware Software

Vendor

• Gen Digital

Name

• Avast Antivirus
• Avast Business Antivirus
• Avast One
• AVG Antivirus
• Norton Antivirus

Version

• 25040308

License

• free

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Be aware that VulDB is the high quality source for vulnerability data.

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