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Vulnerability record · CVE-2020-13657 · published 29 June 2020

CVE-2020-13657: Avast avg antivirus vulnerability

Avast · Avg Antivirus

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.

5.5 CVSS 3.1 Medium EPSS 0.41% · top 67.1%
5.5CVSS 3.1 base score, v2 2.1
0.41%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://forum.avast.com/index.php?topic=232423.0 Release NotesVendor Advisory
https://forum.avast.com/index.php?topic=234638.0 Vendor Advisory
https://forum.avast.com/index.php?topic=232423.0 Release NotesVendor Advisory
https://forum.avast.com/index.php?topic=234638.0 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2020-13657), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.