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CVE Record

CVE-2021-39500: Eyoucms 1.5.4 is vulnerable to Directory Traversal.

Eyoucms 1.5.4 is vulnerable to Directory Traversal. Due to a lack of input data sanitizaton in param tpldir, filename, type, nid an attacker can inject "../" to escape and write file to writeable directories.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Eyoucms 1.5.4 has a directory traversal flaw that may let an attacker escape intended paths and write files into writable directories. For a CMS, unauthorized file writes can threaten site integrity and potentially lead to broader compromise, but the provided sources do not include severity scoring or patch details.

Executive priority

Treat this as a priority if Eyoucms 1.5.4 is deployed on public or business-critical websites. The main business concern is unauthorized website modification or staging of further compromise, though active exploitation is not confirmed by the provided evidence.

Technical view

The CVE describes insufficient input sanitization in the tpldir, filename, type, and nid parameters. Traversal sequences can escape the expected directory boundary and cause file writes to writable directories. The source bundle does not identify endpoints, authentication requirements, CVSS, CWE, or a fixed version.

Likely exposure

Exposure is likely limited to organizations running Eyoucms 1.5.4 where the vulnerable parameter handling is reachable. Risk depends on route exposure, authentication, and filesystem permissions. The provided sources do not prove other versions are affected.

Exploitation context

CISA KEV status is false in the bundle, and no cited source states active exploitation. Public references exist, but the evidence provided does not establish exploit maturity, internet scanning, or weaponized use.

Researcher notes

The record is sparse: no CVSS, CWE, endpoint list, authentication context, or fixed version is included. Analysis should focus on reachability, write permissions, and vendor advisories. Avoid assuming impact beyond the described traversal-to-file-write condition.

Mitigation direction

  • Inventory any Eyoucms deployments and confirm whether version 1.5.4 is present.
  • Check official Eyoucms guidance for a fixed release or vendor mitigation.
  • Restrict public access to affected CMS functionality until remediation is confirmed.
  • Harden filesystem permissions so the web process cannot write outside required directories.
  • Review web server controls that constrain path traversal and unexpected file writes.

Validation and detection

  • Confirm installed Eyoucms versions from deployment records or application metadata.
  • Review application logs for suspicious traversal patterns in relevant parameters.
  • Check writable web directories for unexpected recent files or modified templates.
  • Verify whether vulnerable routes require authentication in your deployment.
  • Retest after remediation to confirm traversal input cannot write files outside intended paths.
Prepared
Confidence
medium
Sources
4

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

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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.

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CVE-2021-39500 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
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.

0CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

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