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Vulnerability record · CVE-2023-5760 · published 8 November 2023

CVE-2023-5760: Avast avg antivirus toctou race condition vulnerability

Avast · Avg Antivirus

A time-of-check to time-of-use (TOCTOU) bug in handling of IOCTL (input/output control) requests. This TOCTOU bug leads to an out-of-bounds write vulnerability which can be further exploited, allowing an attacker to gain full local privilege escalation on the system.This issue affects Avast/Avg Antivirus: 23.8.

7.0 CVSS 3.1 High EPSS 0.19% · top 92.3% CWE-367 · TOCTOU race condition
7.0CVSS 3.1 base score
0.19%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

A time-of-check to time-of-use (TOCTOU) bug in handling of IOCTL (input/output control) requests. This TOCTOU bug leads to an out-of-bounds write vulnerability which can be further exploited, allowing an attacker to gain full local privilege escalation on the system.This issue affects Avast/Avg Antivirus: 23.8.

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

Affected products

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

References

LinkTags
https://support.norton.com/sp/static/external/tools/security-advisories.html Third Party Advisory
https://support.norton.com/sp/static/external/tools/security-advisories.html Third Party 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-2023-5760), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.