HOMEVULNERABILITIESCVE-2021-23428
CRITICAL

CVE-2021-23428

CWE-22Published: September 1, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

This affects all versions of package elFinder.NetCore. The Path.Combine(...) method is used to create an absolute file path. Due to missing sanitation of the user input and a missing check of the generated path its possible to escape the Files directory via path traversal

NVD Source

Technical Analysis

CVE-2021-23428 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

elfinder.netcore_project1 product(s)
elfinder.netcore
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://github.com/gordon-matt/elFinder.NetCore
ADVISORYhttps://snyk.io/vuln/SNYK-DOTNET-ELFINDERNETCORE-1313838
ADVISORYhttps://github.com/gordon-matt/elFinder.NetCore
ADVISORYhttps://snyk.io/vuln/SNYK-DOTNET-ELFINDERNETCORE-1313838

All References (6)

→
https://github.com/gordon-matt/elFinder.NetCoreProduct · Third Party Advisory
→
https://github.com/gordon-matt/elFinder.NetCore/blob/633da9a4d7d5c9baefd1730ee51bf7af54889600/elFinder.NetCore/Drivers/FileSystem/FileSystemDriver.cs%23L387Broken Link
→
https://snyk.io/vuln/SNYK-DOTNET-ELFINDERNETCORE-1313838Third Party Advisory
→
https://github.com/gordon-matt/elFinder.NetCoreProduct · Third Party Advisory
→
https://github.com/gordon-matt/elFinder.NetCore/blob/633da9a4d7d5c9baefd1730ee51bf7af54889600/elFinder.NetCore/Drivers/FileSystem/FileSystemDriver.cs%23L387Broken Link
→
https://snyk.io/vuln/SNYK-DOTNET-ELFINDERNETCORE-1313838Third Party Advisory

Quick Facts

CVE IDCVE-2021-23428
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-22
CISA KEVNo
Affected1 vendor(s)
PublishedSep 1, 2021

Related CVEs (CWE-22)

CVE-2010-5286
10.0
CVE-2025-54261
10.0
CVE-2026-59555
10.0
CVE-2015-0779
10.0
CVE-2025-58321
10.0
CVE-2011-3495
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-23428 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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