CVE-2020-13657

Name: CVE-2020-13657
Creator: NVD / NIST
Published: 2020-06-29T18:15:11.643+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.40%

Last modified Jun 17, 2026

CVE-2020-13657 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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.. EPSS estimates a 0.40% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

0.40%

31.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Avast	Avg Antivirus	< 20.4
Avast	Free Antivirus	< 20.4

References

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

Timeline

Published: Jun 29, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-13657?

How severe is CVE-2020-13657?

CVE-2020-13657 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.40% probability of exploitation in the next 30 days.

How do I fix CVE-2020-13657?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-13657?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST