CVE-2024-11477

Code execution via Zstandard decompression integer underflow

Published Nov 22, 2024 · Updated Feb 15, 2025

Integer underflow in 7-Zip 24.06 allows remote attackers to execute arbitrary code through a crafted Zstandard archive. The Zstandard decompressor fails to validate attacker-controlled size data, permitting an integer underflow before a memory write. Exploitation requires a user or consuming application to decompress the malicious archive, and successful code runs with the privileges of the current process.

CVSS severity7.8
High
EPSS probability22.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer underflow in 7-Zip 24.06 allows remote attackers to execute arbitrary code through a crafted Zstandard archive. The Zstandard decompressor fails to validate attacker-controlled size data, permitting an integer underflow before a memory write. Exploitation requires a user or consuming application to decompress the malicious archive, and successful code runs with the privileges of the current process.

The record

CVE
CVE-2024-11477
Published
Nov 22, 2024
Updated
Feb 15, 2025
Vendor
7-Zip
Product
7-Zip
Classifications
CWE-191, T1203, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 22, 2024CVE publishedPublication date reported by the CVE source.
  2. Feb 15, 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=24.06
  2. Affected versionversion=24.06 <24.07

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

7-Zip · 7-Zipversion=24.06; version=24.06 <24.07

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.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-191Integer Underflow (Wrap or Wraparound)
T1203Exploitation for Client Execution
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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