CVE-2021-25856Public exploitNetwork attack vector

Authenticated file deletion via unvalidated image name

Published Aug 11, 2023 · Updated Oct 9, 2024

Path traversal in superMicro-CMS 3.11 allows remote authenticated users to delete server files through the image manager. In admin/images.php, the delete handler appends the unvalidated delete parameter to ../img/, checks the resulting path, and passes it to unlink. Access requires a logged-in management session, and reachable deletion is limited by the web-server account's filesystem permissions.

CVSS severity4.9
Medium
EPSS probability0.55%
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 superMicro-CMS 3.11 allows remote authenticated users to delete server files through the image manager. In admin/images.php, the delete handler appends the unvalidated delete parameter to ../img/, checks the resulting path, and passes it to unlink. Access requires a logged-in management session, and reachable deletion is limited by the web-server account's filesystem permissions.

The record

CVE
CVE-2021-25856
Published
Aug 11, 2023
Updated
Oct 9, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1070.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 11, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 9, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.9NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1070.004File Deletion

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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