What is CVE-2020-13657?

CVE-2020-13657 is a medium-severity vulnerability in Avast Avg Antivirus. CVSS score: 5.5/10. Published 2020-06-29.

How severe is CVE-2020-13657?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Avast Avg Antivirus

CVE-2020-13657

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.

Published 2020-06-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (33.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 33.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

References

forum.avast.com/index.php (Vendor Advisory)
forum.avast.com/index.php (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2020-13657?: CVE-2020-13657 is a medium-severity vulnerability in Avast Avg Antivirus. CVSS score: 5.5/10. Published 2020-06-29.
How severe is CVE-2020-13657?: Medium severity. CVSS v3 base score is 5.5 out of 10.