Unquoted Service Path Vulnerability in AVAST Antivirus by AVAST
CVE-2025-71326

8.5HIGH

Key Information:

Vendor

Avast

Status
Avast Antivirus
Vendor
CVE Published:
19 June 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-71326?

AVAST Antivirus 25.11 is susceptible to an unquoted service path vulnerability in its SecureLine service. This flaw allows local non-privileged users to execute arbitrary code with elevated SYSTEM permissions. By exploiting the improperly configured binary path, attackers can execute malicious executables under high-level system privileges, potentially compromising the security of the host system. It is vital for users of AVAST Antivirus to apply mitigations to prevent potential exploitation of this vulnerability.

Affected Version(s)

AVAST Antivirus 25.11

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-71326 - Proof of Concept

References

https://www.exploit-db.com/exploits/52510
exploit
https://www.avast.com/
product
https://www.vulncheck.com/advisories/avast-antivirus-unqu...
third-party-advisory

CVSS V4

Score:
8.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Milad Karimi (Ex3ptionaL)
.