CVE-2023-40481

Code execution via unchecked SquashFS buffer write

Published May 3, 2024 · Updated Aug 2, 2024

Out-of-bounds write in 7-Zip 22.01 allows remote attackers to execute code when a crafted SquashFS file is opened or parsed. The SquashFS parser fails to validate user-controlled data before a buffer write, allowing data to pass the end of an allocated buffer. Exploitation requires user interaction, and successful code runs with the privileges of the current 7-Zip process.

CVSS severity7.8
High
EPSS probability13.95%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in 7-Zip 22.01 allows remote attackers to execute code when a crafted SquashFS file is opened or parsed. The SquashFS parser fails to validate user-controlled data before a buffer write, allowing data to pass the end of an allocated buffer. Exploitation requires user interaction, and successful code runs with the privileges of the current 7-Zip process.

The record

CVE
CVE-2023-40481
Published
May 3, 2024
Updated
Aug 2, 2024
Vendor
7-Zip
Product
7-Zip
Classifications
CWE-787, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 3, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record 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=22.01

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

7-Zip · 7-Zipversion=22.01

Published CVSS scores

7.8Zero Day InitiativeCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1204.002Malicious File

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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