CVE-2023-1586

Arbitrary file creation via restore race

Published Apr 19, 2023 · Updated Feb 5, 2025

TOCTOU in the restore process of Avast and AVG Antivirus for Windows 22.5 through 22.10 allows local users to create arbitrary files. The restore workflow checks filesystem state separately from creating its destination, allowing that state to change between the two operations; no lower-level locus is public. Exploitation requires low-privileged local access and winning the race, and its bounded result is creation of an attacker-chosen file.

CVSS severity6.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

TOCTOU in the restore process of Avast and AVG Antivirus for Windows 22.5 through 22.10 allows local users to create arbitrary files. The restore workflow checks filesystem state separately from creating its destination, allowing that state to change between the two operations; no lower-level locus is public. Exploitation requires low-privileged local access and winning the race, and its bounded result is creation of an attacker-chosen file.

The record

CVE
CVE-2023-1586
Published
Apr 19, 2023
Updated
Feb 5, 2025
Vendor
AVG
Product
AVG AntiVirus
Classifications
CWE-367
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 19, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 5, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=22.5 <=22.10

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

AVG · AVG AntiVirusversion=22.5 <=22.10
Avast · Avast Antivirusversion=22.5 <=22.10

Published CVSS scores

4.7NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
6.5NortonLifeLock Inc.CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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