CVE-2025-71326Public exploit

SYSTEM code execution via unquoted service path

Published Jun 19, 2026 · Updated Jun 19, 2026

Unquoted service path in Avast Antivirus 25.11 allows local users to execute code as SYSTEM through the SecureLine service. The SecureLine service registers C:\Program Files\AVAST Software\SecureLine\VpnSvc.exe without quotation marks, so Windows can resolve an attacker-placed executable earlier in the spaced path. A low-privileged Windows account and write access to a candidate path are required; successful execution grants full SYSTEM privileges when the service starts.

CVSS severity8.5
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Unquoted service path in Avast Antivirus 25.11 allows local users to execute code as SYSTEM through the SecureLine service. The SecureLine service registers C:\Program Files\AVAST Software\SecureLine\VpnSvc.exe without quotation marks, so Windows can resolve an attacker-placed executable earlier in the spaced path. A low-privileged Windows account and write access to a candidate path are required; successful execution grants full SYSTEM privileges when the service starts.

The record

CVE
CVE-2025-71326
Published
Jun 19, 2026
Updated
Jun 19, 2026
Vendor
Avast
Product
Avast Antivirus
Classifications
CWE-428, T1574.009
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=25.11

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Avast · Avast Antivirusversion=25.11

Published CVSS scores

7.8VulnCheckCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.5VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-428Unquoted Search Path or Element
T1574.009Path Interception by Unquoted Path

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo