Security readout for executives and security teams
Plain-English summary
CVE-2021-47819 is a critical vulnerability in ProjeQtOr Project Management 9.1.4. A guest user can upload a PHP file and have the server run it, potentially giving an attacker control over the application server. Public exploit information is referenced, but the provided sources do not show confirmed active exploitation.
Executive priority
Treat this as urgent for any exposed ProjeQtOr 9.1.4 system. The vulnerability can enable full server compromise without authentication. If ProjeQtOr is not deployed, business impact is likely none. If deployed internally only, still validate access boundaries and remediate promptly.
Technical view
The issue is CWE-434: unrestricted upload of a dangerous file type. In ProjeQtOr 9.1.4, guest-accessible profile attachments can accept PHP content that may execute on the server. CVSS 3.1 is 9.8, reflecting network reachability, no privileges, no user interaction, and high confidentiality, integrity, and availability impact.
Likely exposure
Organizations running ProjeQtOr Project Management 9.1.4 are the known exposed group. Risk is highest where the application is internet-facing or reachable by untrusted users, and guest-accessible attachment functionality is available. The source bundle does not identify other affected versions.
Exploitation context
The source bundle includes an ExploitDB reference, indicating public exploit information exists. The CVE is not marked as CISA KEV in the provided data, and no cited source confirms active exploitation in the wild.
Researcher notes
Evidence is strong for ProjeQtOr 9.1.4 and CWE-434 remote code execution based on the CVE bundle and ExploitDB reference. The bundle does not include a vendor advisory, fixed version, or confirmation of exploitation in the wild. Avoid broad version assumptions beyond 9.1.4.
Mitigation direction
- Identify any ProjeQtOr Project Management 9.1.4 deployments.
- Check ProjeQtOr vendor guidance and release notes for an official fix or upgrade path.
- Prioritize remediation for internet-facing or untrusted-user-accessible deployments.
- Until remediated, reduce untrusted access to guest-accessible upload features where feasible.
- Monitor application and web server logs for suspicious uploaded PHP files.
Validation and detection
- Confirm installed ProjeQtOr versions across production and non-production systems.
- Review whether guest users can access profile attachment upload functionality.
- Check web server configuration for executable PHP in upload or attachment paths.
- Review recent attachment uploads for unexpected PHP or script-like files.
- Verify remediation by confirming the vendor-recommended fixed version or configuration is applied.
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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program 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-2021-47819 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
- ExploitDB-49919CVE reference · exploit
- ProjeQtOr Official WebsiteCVE reference · product
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.