Security readout for executives and security teams
Plain-English summary
This flaw lets an unauthenticated remote attacker abuse the Chain Sea ai chatbot system upload feature to place and run a malicious script. Successful exploitation could let the attacker take control of the affected system or disrupt service.
Executive priority
Treat this as urgent for any exposed deployment. The business risk is full system compromise or service termination without attacker authentication, but affected-version and patch details require vendor confirmation.
Technical view
CVE-2021-44164 is a CWE-434 arbitrary file upload issue. Insufficient filtering of special characters in URLs can bypass file type validation in the upload function, enabling unauthenticated remote script upload and arbitrary code execution. CVSS 3.1 is 9.8 critical.
Likely exposure
Exposure is likely limited to organizations running Chain Sea Information Integration Co., Ltd ai chatbot system with the vulnerable upload function reachable by attackers. The public record provides limited version detail, lists version “0,” and includes no CPEs.
Exploitation context
The CVE record describes unauthenticated remote code execution potential. The provided data does not show CISA KEV listing or cite active exploitation, so active exploitation should not be assumed from these sources alone.
Researcher notes
The core issue is upload validation bypass through special characters in URLs. Public metadata is sparse: affected version data is not meaningful, no CPEs are listed, and no exploit evidence is provided in the bundle.
Mitigation direction
- Check Chain Sea and TWCERT guidance for vendor-confirmed fixes or workarounds.
- Restrict external access to the chatbot upload function until remediation is confirmed.
- Disable or gate unauthenticated uploads if business operations allow.
- Review web server and application permissions around uploaded files.
- Prioritize remediation because compromise could affect confidentiality, integrity, and availability.
Validation and detection
- Inventory deployments of Chain Sea ai chatbot system.
- Confirm whether the file upload function is enabled and internet reachable.
- Check vendor-provided version or build status against advisory guidance.
- Review logs for unexpected uploads, script execution, or service disruption.
- Verify compensating controls block unauthenticated access to upload paths.
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-2021-44164 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://www.twcert.org.tw/tw/cp-132-5400-c31d1-1.htmlCVE reference · x_refsource_MISC
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.