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Vulnerability record · CVE-2021-31641 · published 1 June 2021

CVE-2021-31641: Chiyu-tech bf-430 firmware cross-site scripting vulnerability

CChiyu Tech · Bf 430 Firmware

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.

6.1 CVSS 3.1 Medium EPSS 5.1% · top 7.9% CWE-79 · Cross-site scripting
6.1CVSS 3.1 base score, v2 4.3
5.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
15Affected product versions listed by NVD
8References, 6 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

15 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://packetstormsecurity.com/files/162887/CHIYU-IoT-Cross-Site-Scripting.html ExploitThird Party AdvisoryVDB Entry
https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31641 ExploitThird Party Advisory
https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/#.YLY_lXmSlPY ExploitThird Party Advisory
https://www.chiyu-tech.com/msg/message-Firmware-update-87.html Vendor Advisory
http://packetstormsecurity.com/files/162887/CHIYU-IoT-Cross-Site-Scripting.html ExploitThird Party AdvisoryVDB Entry
https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31641 ExploitThird Party Advisory
https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/#.YLY_lXmSlPY ExploitThird Party Advisory
https://www.chiyu-tech.com/msg/message-Firmware-update-87.html Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2021-31251Chiyu-tech bf-430 firmware improper authentication vulnerabilityAn authentication bypass in telnet server in BF-430 and BF431 232/422 TCP/IP Converter, BF-450M and SEMAC from CHIYU Technology Inc allows obtaining …EPSS 36%6.5CVE-2021-31249Chiyu-tech bf-430 firmware injection vulnerabilityA CRLF injection vulnerability was found on BF-430, BF-431, and BF-450M TCP/IP Converter devices from CHIYU Technology Inc due to a lack of validatio…EPSS 18%6.5CVE-2021-31642Chiyu-tech semac s2 firmware integer overflow vulnerabilityA denial of service condition exists after an integer overflow in several IoT devices from CHIYU Technology, including BIOSENSE, Webpass, and BF-630,…EPSS 44%6.1CVE-2021-31252Chiyu-tech bf-430 firmware open redirect vulnerabilityAn open redirect vulnerability exists in BF-630, BF-450M, BF-430, BF-431, BF631-W, BF830-W, Webpass, and SEMAC devices from CHIYU Technology that can…EPSS 29%5.4CVE-2021-31250CHIYU TCP/IP Converter Web CGI Stored XSSCHIYU BF-430, BF-431 and BF-450M TCP/IP converter devices fail to sanitize input in the man.cgi, if.cgi, dhcpc.cgi and ppp.cgi components, allowing s…EPSS 80%analysed5.4CVE-2021-31643CHIYU IoT devices stored XSS in if.cgi username parameterSeveral CHIYU Technology IoT devices (SEMAC, Biosense, BF-630, BF-631, Webpass) fail to sanitize the username parameter in if.cgi, allowing cross-sit…EPSS 88%analysed6.1CVE-2026-42897Microsoft Exchange Server XSS enables spoofingMicrosoft Exchange Server and Exchange Server Subscription Edition fail to neutralize input during web page generation, a cross-site scripting flaw (…KEVEPSS 0.52%analysed6.1CVE-2025-48700Zimbra Classic UI stored XSS via crafted email HTMLZimbra Collaboration Suite Classic UI fails to properly sanitize HTML content in email messages, allowing crafted tag structures and attribute values…KEVEPSS 1.7%analysed

Source: NIST National Vulnerability Database (record CVE-2021-31641), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.