CVE-2020-17564Public exploitNetwork attack vector

Unauthenticated file deletion via unfiltered path parameters

Published Apr 22, 2021 · Updated Aug 4, 2024

Path traversal in FeiFeiCMS 4.0 allows remote attackers to delete arbitrary server files through a crafted HTTP request. Admin/DataAction.class.php directly appends unfiltered GET and POST values to filesystem paths before invoking its deletion logic. The endpoint requires no authentication, but the targeted _bak directory exists only after the backup function creates it; deletion is limited to files writable by the web process.

CVSS severity9.1
Critical
EPSS probability2.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in FeiFeiCMS 4.0 allows remote attackers to delete arbitrary server files through a crafted HTTP request. Admin/DataAction.class.php directly appends unfiltered GET and POST values to filesystem paths before invoking its deletion logic. The endpoint requires no authentication, but the targeted _bak directory exists only after the backup function creates it; deletion is limited to files writable by the web process.

The record

CVE
CVE-2020-17564
Published
Apr 22, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-22, T1485
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 22, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
6.4NIST NVDAV:N/AC:L/Au:N/C:N/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1485Data Destruction

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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