What’s Vulnerable › Vulnerabilities

CVE-2021-23427: Arbitrary File Write via Archive Extraction (Zip Slip)

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-09-01 · updated 2026-06-17
• Weakness: CWE-22

Description

This affects all versions of package elFinder.NetCore. The ExtractAsync function within the FileSystem is vulnerable to arbitrary extraction due to insufficient validation.

Affected products

• elFinder.NetCore: all versions

References

• https://github.com/gordon-matt/elFinder.NetCore/blob/633da9a4d7d5c9baefd1730ee51bf7af54889600/elFinder.NetCore/Drivers/FileSystem/FileSystemDriver.cs%23L226
• https://snyk.io/vuln/SNYK-DOTNET-ELFINDERNETCORE-1567778
• https://github.com/gordon-matt/elFinder.NetCore/blob/633da9a4d7d5c9baefd1730ee51bf7af54889600/elFinder.NetCore/Drivers/FileSystem/FileSystemDriver.cs%23L226
• https://snyk.io/vuln/SNYK-DOTNET-ELFINDERNETCORE-1567778

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