TI-2020-10717 Aliases CVE-2020-13657 GHSA-p9cq-92f2-wgq6

An elevation of privilege vulnerability exists in Avast Free Antivirus and AVG AntiVirus…

LOW 25Published 2020-06-29 · Updated 2024-08-04

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

An elevation of privilege vulnerability exists in Avast Free Antivirus and AVG AntiVirus Free before 20.4 due to improperly handling hard links. The vulnerability allows local users to take control of arbitrary files.

Why it matters now

EPSS 0.00412 35th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:a:avast:avg_antivirus:::::free:::*	before 20.4	Vulnerable	Avast
cpe:2.3:a:avast:free_antivirus::::::::	before 20.4	Vulnerable	Avast

cpe:2.3:a:avast:avg_antivirus:*:*:*:*:free:*:*:* Versions before 20.4 Vulnerable ·Avast
cpe:2.3:a:avast:free_antivirus:*:*:*:*:*:*:*:* Versions before 20.4 Vulnerable ·Avast

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2020-13657
2026-10-03 Alias added: GHSA-p9cq-92f2-wgq6

References

Advisory 2

TI-2022-03818 Avast and AVG Antivirus for Windows vulnerable to Privilege Escalation CVSS 3.1HIGH 8.8
TI-2023-05298 Time-of-check to time-of-use (TOCTOU) bug leads to full local privilege escalation. CVSS 3.1HIGH 8.2

Sources

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