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7 ZipApplication

CVE-2023-31102

HIGH · 7.8 CVSS v3.1 Published 2023-11-03
Fix available
A fix is available. Upgrade to 22.01 or later.
See remediation →
81/100
Remediation priority · High
High EPSS No privileges

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Ppmd7.c in 7-Zip before 23.00 allows an integer underflow and invalid read operation via a crafted 7Z archive.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

Ppmd7.c in 7-Zip before version 23.00 contains an integer underflow vulnerability that leads to an invalid read operation when decompressing specially crafted 7Z archives using the PPMd algorithm. An attacker can exploit this by delivering a malicious archive to trigger the underflow and read memory outside allocated buffers.

MitigationUpgrade to 7-Zip version 23.00 or later. Until patched, avoid opening 7Z archives from untrusted sources as they may contain specially crafted payloads designed to trigger this vulnerability.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
7 ZipApplication
Affected:< 22.01
Active Iq Unified ManagerApplication
Affected:all versions
Oncommand Workflow AutomationApplication
Affected:all versions

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify installed 7-Zip version on Windows
    Open Command Prompt and run: '7z' or check Program Files for 7-Zip folder, or run 'reg query "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\7-Zip" /v DisplayVersion'
    Affected if The installed version is earlier than 22.01 (or 23.00 per vendor advisory)
  2. Identify installed 7-Zip version on Linux/Unix
    Run '7z --help' or '7zz --help' or check package manager: 'dpkg -l | grep -i 7zip' or 'rpm -qa | grep -i 7zip'
    Affected if The installed version is earlier than 22.01 (or 23.00 per vendor advisory)
  3. Check NetApp Active IQ Unified Manager for version
    Access the product UI or run: 'about' command in the CLI, or check installed packages for 7-Zip component
    Affected if The product is running any version (all versions affected per advisory)
  4. Check NetApp Oncommand Workflow Automation for version
    Access the product UI or check installed software components for bundled 7-Zip
    Affected if The product is running any version (all versions affected per advisory)
  5. Determine if PPMd compression method is in use
    Inspect any 7Z archive headers using: '7z l -slt archive.7z' and look for 'Method: PPMD' or similar in the output
    Affected if The archive was created using PPMd method and 7-Zip version is vulnerable

You are affected if 7-Zip version is lower than 22.01 (or 23.00 per official vendor range) OR any NetApp Active IQ Unified Manager or Oncommand Workflow Automation installation is present, and you handle 7Z archives using the PPMd algorithm.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 22.01 or later
Fixed in 22.01
Interim mitigation

Upgrade to 7-Zip version 23.00 or later. Until patched, avoid opening 7Z archives from untrusted sources as they may contain specially crafted payloads designed to trigger this vulnerability.

Recommended fix High confidence

7-Zip version 23.00 or later

  1. 1. Inventory all systems with 7-Zip installed to identify versions prior to 23.00
  2. 2. Download 7-Zip version 23.00 or later from the official source (www.7-zip.org)
  3. 3. Uninstall existing 7-Zip instances on affected workstations/servers
  4. 4. Install the updated 7-Zip version 23.00 or later on all identified systems
  5. 5. For NetApp Active IQ Unified Manager and Oncommand Workflow Automation products, monitor vendor security advisories (security.netapp.com) for product-specific patches since these contain vulnerable 7-Zip code
Caveat Standard upgrade; review release notes for any functional changes in 23.00+

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in 7 Zip Scoped from the published advisory
  • Consultation1.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,040
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,664.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2023-31102 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data