CVE-2014-8140Network attack vector

Remote code execution via malformed extra field size

Published Jan 31, 2020 · Updated Aug 6, 2024

Heap-based buffer overflow in Info-ZIP UnZip 6.0 and earlier allows remote attackers to execute code via a crafted ZIP archive passed to -t. The test_compr_eb function trusts an uncompressed-size value in an NTSD extra field; a zero or inconsistent size bypasses validation and drives an out-of-bounds heap write while testing the archive. Exploitation requires a victim or service to invoke unzip -t on the attacker-supplied archive, after which process-level code execution and possible compromise occur.

CVSS severity6.8
Medium
EPSS probability7.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in Info-ZIP UnZip 6.0 and earlier allows remote attackers to execute code via a crafted ZIP archive passed to -t. The test_compr_eb function trusts an uncompressed-size value in an NTSD extra field; a zero or inconsistent size bypasses validation and drives an out-of-bounds heap write while testing the archive. Exploitation requires a victim or service to invoke unzip -t on the attacker-supplied archive, after which process-level code execution and possible compromise occur.

The record

CVE
CVE-2014-8140
Published
Jan 31, 2020
Updated
Aug 6, 2024
Vendor
Info-ZIP
Product
UnZip
Classifications
CWE-190, CWE-120, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 31, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 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=6.0 and earlier

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Info-ZIP · UnZipversion=6.0 and earlier

Published CVSS scores

7.8NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Underflow
CWE-120Classic Buffer Overflow
T1203Exploitation for Client Execution

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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