#VU107930 Integer overflow in Avast Antivirus - CVE-2025-3500

Vulnerability identifier: #VU107930

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-3500

CWE-ID: CWE-190

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Avast Antivirus
Client/Desktop applications / Antivirus software/Personal firewalls

Vendor: Avast Software s.r.o.

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to an integer overflow within the aswbidsdriver kernel driver. A local user can trigger an integer overflow and execute arbitrary code with elevated privileges.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Avast Antivirus: 20.1.2397 - 2016.11.1.2262

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External links
https://www.zerodayinitiative.com/advisories/ZDI-25-256/

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.