Installer of 7-Zip for Windows may insecurely load Dynamic Link Libraries


7-Zip for Windows is an open source compression and decompression software. The installer of 7-Zip for Windows contains an issue with the DLL search path, which may lead to insecurely loading Dynamic Link Libraries.

Takashi Yoshikawa of Mitsui Bussan Secure Directions reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.
CVSS Severity (What is CVSS?)

CVSS V3 Severity:
Base Metrics 7.8 (High) [IPA Score]
  • Attack Vector: Local
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Unchanged
  • Confidentiality Impact: High
  • Integrity Impact: High
  • Availability Impact: High
CVSS V2 Severity:
Base Metrics 6.8 (Medium) [IPA Score]
  • Access Vector: Network
  • Access Complexity: Medium
  • Authentication: None
  • Confidentiality Impact: Partial
  • Integrity Impact: Partial
  • Availability Impact: Partial
Affected Products

  • 7-Zip for Windows 16.02 and earlier


Arbitrary code may be executed with the privilege of the user invoking the installer.

[Use the Latest Installer]
Use the latest installer according to the information provided by the developer.
This vulnerability has been addressed in 7-Zip for Windows 16.0.3.
Vendor Information

CWE (What is CWE?)

  1. No Mapping(CWE-Other) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2016-7804

  1. JVN : JVN#76780067
  2. National Vulnerability Database (NVD) : CVE-2016-7804
Revision History

  • [2016/10/26]
      Web page was published
      References : Content was added