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TI-2025-43447 Aliases CVE-2025-71326GHSA-qqxm-j467-m9mr

AVAST Antivirus 25.11 Unquoted Service Path Privilege Escalation

Priority HIGH 72CWE-428Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-428.

Summary

AVAST Antivirus 25.11 contains an unquoted service path vulnerability in the SecureLine service that allows local non-privileged users to execute code with elevated SYSTEM privileges. Attackers can exploit the unquoted binary path in the service configuration to inject malicious executables that execute with high-level system permissions.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00182 7th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
AvastAVAST Antivirus25.11—No fix listedCNA
  • AVAST Antivirus VendorAvast Affected 25.11 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-71326
  2. 2026-10-03 Alias added: GHSA-qqxm-j467-m9mr

References

Exploit 1

Other 1

  • TI-2020-19172 AVAST SecureLine 5.5.522.0 - 'SecureLine' Unquoted Service Path CVSS 4.0HIGH 8.5
  • TI-2010-02987 Untrusted search path vulnerability in avast! Free Antivirus version 5.0.594 and earlier… CVSS 2.0HIGH 9.3
  • TI-2007-02752 Heap-based buffer overflow in the CAB unpacker in avast! Anti-Virus Managed Client before… CVSS 2.0HIGH 9.3
  • TI-2020-14724 An issue was discovered in retdec v3.3. CVSS 3.1CRITICAL 9.8
  • TI-2020-08753 An issue was discovered in Avast Antivirus before 20. CVSS 3.1CRITICAL 9.8
  • TI-2017-05872 In Avast Antivirus before v17, using the LPC interface API exposed by the AvastSVC.exe… CVSS 3.0CRITICAL 9.8
See all 83 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences