Privilege escalation in Avast Free Antivirus



Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2025-3500
CWE-ID CWE-190
Exploitation vector Local
Public exploit N/A
Vulnerable software
 Avast Antivirus
Client/Desktop applications / Antivirus software/Personal firewalls

Vendor Avast Software s.r.o.

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Integer overflow

EUVDB-ID: #VU107930

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 - Integer overflow

Exploit availability: No

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

CPE2.3 External links

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


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.



###SIDEBAR###