Security readout for executives and security teams
Plain-English summary
CVE-2021-25856 describes a file deletion issue in pcmt superMicro-CMS 3.11 through a crafted image file handled by images.php. The public record gives limited operational detail, so urgency depends on whether this CMS is deployed and reachable in your environment.
Executive priority
Prioritize discovery first. If superMicro-CMS 3.11 is present and exposed, treat this as a containment and remediation item because file deletion can affect availability and site integrity.
Technical view
The CVE states that superMicro-CMS version 3.11 allows attackers to delete files via a crafted image file in images.php. The source bundle does not provide CVSS scoring, CWE classification, authentication requirements, affected file scope, or a confirmed fixed version.
Likely exposure
Exposure is most likely where pcmt superMicro-CMS 3.11 is installed and images.php is reachable by users or the internet. The CVE record does not identify broader affected versions or CPEs.
Exploitation context
CISA KEV is false, and the provided sources do not claim active exploitation. Public information indicates a crafted image file can trigger file deletion, but does not provide enough detail to judge exploit reliability or prerequisites.
Researcher notes
The record is sparse: no CVSS, CWE, CPE, patch reference, authentication context, or file deletion scope is provided. Avoid assuming affected versions beyond superMicro-CMS 3.11 unless project evidence confirms them.
Mitigation direction
- Inventory any pcmt superMicro-CMS deployments and confirm versions.
- Check the project issue and vendor guidance for a fixed release or workaround.
- Restrict access to images.php and upload functionality where feasible.
- Ensure backups cover CMS files and uploaded content.
- Monitor for unexpected file deletion or image upload activity.
Validation and detection
- Confirm whether superMicro-CMS 3.11 exists in production or staging.
- Verify whether images.php is reachable by untrusted users.
- Review application logs for suspicious image handling activity.
- Check file integrity or backups for unexplained deletions.
- Document any compensating controls until vendor guidance is confirmed.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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.
CVE-2021-25856 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/pcmt/superMicro-CMS/issues/1CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.