What is CVE-2023-1586?

CVE-2023-1586 is a medium-severity vulnerability in Avast Antivirus, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 6.5/10. Published 2023-04-19.

How severe is CVE-2023-1586?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Avast Antivirus

CVE-2023-1586

Avast and AVG Antivirus for Windows were susceptible to a Time-of-check/Time-of-use (TOCTOU) vulnerability in the restore process leading to arbitrary file creation. The issue was fixed with Avast and AVG Antivirus version 22.11

Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)

Published 2023-04-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L.

EPSS exploit prediction

EPSS: 0.002 (10.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 10.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-367 — Time-of-check Time-of-use (TOCTOU) Race Condition

References

support.norton.com/sp/static/external/tools/security-advisories.html (Third Party Advisory)

Frequently asked questions

What is CVE-2023-1586?: CVE-2023-1586 is a medium-severity vulnerability in Avast Antivirus, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 6.5/10. Published 2023-04-19.
How severe is CVE-2023-1586?: Medium severity. CVSS v3 base score is 6.5 out of 10.