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CVE Record

CVE-2021-31250: Multiple storage XSS vulnerabilities were discovered on BF-430, BF-431 and BF-450M TCP/IP Converter devices...

Multiple storage XSS vulnerabilities were discovered on BF-430, BF-431 and BF-450M TCP/IP Converter devices from CHIYU Technology Inc due to a lack of sanitization of the input on the components man.cgi, if.cgi, dhcpc.cgi, ppp.cgi.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2021-31250 is a stored cross-site scripting issue in CHIYU BF-430, BF-431, and BF-450M TCP/IP Converter devices. If an attacker can save malicious input into affected management components, later administrators may execute attacker-controlled script in their browser. Business risk depends heavily on whether these devices exist and whether management access is exposed.

Executive priority

Treat this as an exposure-driven issue. Prioritize inventory and management-interface isolation first, then apply CHIYU-supported firmware guidance where applicable. Urgency rises if affected devices are internet-facing or used in sensitive operational environments.

Technical view

The CVE describes multiple stored XSS vulnerabilities caused by missing input sanitization in man.cgi, if.cgi, dhcpc.cgi, and ppp.cgi on CHIYU BF-430, BF-431, and BF-450M devices. The source bundle provides no CVSS score, CWE mapping, confirmed exploit status, or detailed remediation beyond vendor firmware guidance.

Likely exposure

Exposure is most likely in organizations using the named CHIYU TCP/IP Converter devices, especially where administrative web interfaces are reachable from broad internal networks or the internet. The provided data does not identify other products or versions.

Exploitation context

The source bundle does not show CISA KEV listing or confirmed active exploitation. Stored XSS generally requires a path to write affected fields and a victim administrator viewing the stored content, but the provided sources do not establish real-world exploitation.

Researcher notes

Evidence is limited: the CVE names models and vulnerable CGI components, but lacks CVSS, affected firmware ranges, CWE, exploit confirmation, and precise fixed versions in the supplied bundle. Avoid expanding scope beyond BF-430, BF-431, and BF-450M without vendor confirmation.

Mitigation direction

  • Inventory CHIYU BF-430, BF-431, and BF-450M devices.
  • Check CHIYU firmware guidance for the exact model and version.
  • Restrict management access to trusted administrative networks.
  • Remove internet exposure for device administration interfaces.
  • Review vendor advisories before applying any firmware update.

Validation and detection

  • Confirm whether named CHIYU models are deployed.
  • Record current firmware versions for affected devices.
  • Verify management interfaces are not publicly reachable.
  • Review administrative access logs for unusual changes.
  • Test sanitization only in an authorized lab environment.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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

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CVE-2021-31250 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

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.

0CVSS vectors
0Timeline events
0ADP providers
4Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.