LiveActive security incident?Get immediate response
CVE Record

CVE-2021-23407: Directory Traversal

This affects the package elFinder.Net.Core from 0 and before 1.2.4. The user-controlled file name is not properly sanitized before it is used to create a file system path.

HighCVSS 7.5Not KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2021-23407 is a high-severity directory traversal flaw in elFinder.Net.Core before 1.2.4. A remote unauthenticated attacker may be able to abuse unsafe filename handling to read files outside the intended directory. The documented impact is confidentiality loss, not data modification or service outage.

Executive priority

Treat this as a prompt remediation item for any internet-facing or customer-accessible deployment. The main business risk is unauthorized disclosure of sensitive server-side files, which can expose credentials, configuration, source material, or customer data depending on deployment.

Technical view

elFinder.Net.Core before 1.2.4 did not properly sanitize a user-controlled filename before using it to construct a filesystem path. The CVSS 3.1 vector is network exploitable, low complexity, no privileges, no user interaction, unchanged scope, with high confidentiality impact and no listed integrity or availability impact.

Likely exposure

Exposure is likely where applications use vulnerable elFinder.Net.Core versions and expose file-manager or file-access functionality to untrusted users or the internet. The source bundle does not identify specific downstream products or deployments.

Exploitation context

The CVE is not listed as CISA KEV in the supplied data. The CVSS metadata indicates proof-of-concept exploit maturity, but the provided sources do not establish active exploitation in the wild.

Researcher notes

The evidence supports a path traversal root cause tied to filename sanitization and a fix in release 1.2.4. The bundle does not provide CWE mapping, affected CPEs, downstream product names, or confirmed exploitation details, so scope validation depends on local dependency and route inventory.

Mitigation direction

  • Upgrade elFinder.Net.Core to version 1.2.4 or later.
  • Inventory applications and services that depend on elFinder.Net.Core.
  • Restrict public access to file-management endpoints where business requirements allow.
  • Review vendor release notes and the referenced fixing commit.
  • Monitor logs for unusual file-read attempts around file-manager routes.

Validation and detection

  • Check dependency manifests and deployed artifacts for elFinder.Net.Core versions before 1.2.4.
  • Identify internet-facing routes that expose elFinder.Net.Core functionality.
  • Confirm production instances run the patched dependency version.
  • Run non-destructive staging tests to confirm filenames remain within the allowed root.
  • Review access logs for suspicious path traversal patterns without replaying attacks.
Prepared
Confidence
high
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

description · low confidence lookup

File access behavior lookup

The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2021-23407 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
High
CVSS
7.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
4Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C3.93.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2021-23407Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/aelFinder.Net.Core0, unspecifiedListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.