Security readout for executives and security teams
Plain-English summary
CVE-2021-31252 is an open redirect issue in listed CHIYU Technology access-control and Webpass devices. An attacker could send a crafted link that appears to involve a trusted device but redirects a user elsewhere, supporting phishing or credential-theft scenarios. Sources do not provide CVSS scoring or confirmed active exploitation.
Executive priority
Treat this as a phishing-enablement risk around physical access infrastructure. Prioritize inventory, vendor update checks, and exposure reduction, but do not treat it as confirmed active exploitation based on the supplied evidence.
Technical view
The CVE describes an open redirect affecting BF-630, BF-450M, BF-430, BF-431, BF631-W, BF830-W, Webpass, and SEMAC devices. The documented attack path is user-assisted: a victim must click a specially crafted URL. The provided sources do not include technical root cause, affected firmware ranges, or exploit-in-the-wild evidence.
Likely exposure
Organizations using the named CHIYU physical access or Webpass devices may be exposed, especially where device web interfaces are reachable by users or externally accessible. Exact vulnerable firmware versions are not stated in the source bundle.
Exploitation context
No source in the bundle confirms active exploitation, and CISA KEV status is false. The described use case is social engineering through a crafted link, not direct unauthenticated device takeover.
Researcher notes
Evidence is limited. The bundle identifies affected model families and user-click exploitation, but does not provide CVSS, firmware version boundaries, request details, or root-cause analysis. Validate only through safe configuration review and vendor documentation.
Mitigation direction
- Check CHIYU firmware guidance for the named device models.
- Apply applicable vendor firmware updates where available.
- Limit device web interfaces to trusted management networks.
- Avoid exposing these device interfaces directly to the internet.
- Train users not to trust unexpected device-login links.
Validation and detection
- Inventory CHIYU BF, Webpass, and SEMAC devices in use.
- Compare model and firmware status with CHIYU advisories.
- Confirm management interfaces are restricted from public access.
- Review security reports for suspicious links referencing these devices.
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-2021-31252 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://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/CVE reference · x_refsource_MISC
- https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31252CVE reference · x_refsource_MISC
- https://www.chiyu-tech.com/msg/message-Firmware-update-87.htmlCVE reference · x_refsource_CONFIRM
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.