Security readout for executives and security teams
Plain-English summary
CVE-2021-4436 affects the 3DPrint Lite WordPress plugin before 1.9.1.5. An unauthenticated visitor could upload arbitrary files to the web server. On Apache, a bundled .htaccess reportedly blocks direct access, but exposure remains serious because upload controls are missing.
Executive priority
Treat this as urgent for any public WordPress site using 3DPrint Lite. The vulnerability has critical severity and requires no login, but active exploitation is not established by the provided sources.
Technical view
The vulnerable p3dlite_handle_upload AJAX action lacks authorization checks and file validation, creating an unauthenticated arbitrary file upload issue classified as CWE-434. The record assigns CVSS 3.1 score 9.8. Source data identifies 3DPrint Lite versions before 1.9.1.5 as affected.
Likely exposure
Exposure is likely limited to WordPress sites with the 3DPrint Lite plugin installed below version 1.9.1.5. The source bundle does not provide reliable install prevalence or affected hosting configurations.
Exploitation context
WPScan labels the entry with an exploit tag, but the bundle provides no KEV listing and no cited evidence of active exploitation. The Apache .htaccess restriction may reduce direct file access, not the underlying upload flaw.
Researcher notes
The affected metadata is incomplete and somewhat inconsistent: vendor is Unknown and the structured affected version lists 0, while the title and description state before 1.9.1.5. Validate against plugin inventory and WPScan details.
Mitigation direction
- Upgrade 3DPrint Lite to version 1.9.1.5 or later.
- Disable the plugin until the installed version is confirmed safe.
- Review vendor or plugin guidance for official remediation details.
- Inspect uploaded plugin directories for unexpected files.
- Prioritize internet-facing WordPress sites first.
Validation and detection
- Inventory WordPress sites for the 3DPrint Lite plugin.
- Confirm each installed plugin version is 1.9.1.5 or later.
- Check whether the p3dlite_handle_upload AJAX action is reachable anonymously.
- Review web server logs for suspicious unauthenticated upload activity.
- Verify Apache .htaccess protections exist where applicable.
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.
CWE-434: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupFile 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 lookupCVE-2021-4436 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
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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 vector scores
1 official scoreWe 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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://wpscan.com/vulnerability/c46ecd0d-a132-4ad6-b936-8acde3a09282/CVE reference · exploit, vdb-entry
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.
Unrestricted Upload of File with Dangerous Type
Unrestricted Upload of File with Dangerous Type represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.