CVE-2021-31641

An unauthenticated XSS vulnerability exists in several IoT devices from CHIYU Technology,...

6.1 Medium

An unauthenticated XSS vulnerability exists in several IoT devices from CHIYU Technology, including BF-630, BF-450M, BF-430, BF-431, BF631-W, BF830-W, Webpass, BF-MINI-W, and SEMAC due to a lack of sanitization when the HTTP 404 message is generated.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: None

Exploit likelihood

5.12%Up 4.0 points since Jun 2, 2021

What each source reports

NVD Score used 6.1

Record: CVE-2021-31641
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS 2.0: 4.3 MediumAV:N/AC:M/Au:N/C:N/I:P/A:N
Weakness: CWE-79
Updated: 2026-11-02

CVE List No score

Record: CVE-2021-31641
Updated: 2026-11-02

EUVDEUVD-2021-18529 No score

Record: EUVD-2021-18529
Updated: 2026-11-03

GitHub AdvisoriesGHSA-j8pq-98x9-wx56 No score

An unauthenticated XSS vulnerability exists in several IoT devices from CHIYU Technology,...

Record: GHSA-j8pq-98x9-wx56
Weakness: CWE-79
Updated: 2026-11-02

Affected products

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History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-31641 is a medium vulnerability (CVSS 6.1) in Chiyu-tech Bf-430 Firmware, published June 1, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 5.12%, the 92nd percentile. No source names a fixed version.