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Vulnerability record · CVE-2021-31249 · published 4 June 2021

CVE-2021-31249: Chiyu-tech bf-430 firmware injection vulnerability

CChiyu Tech · Bf 430 Firmware

A 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 validation on the parameter redirect= available on multiple CGI components.

6.5 CVSS 3.1 Medium EPSS 18% · top 2.9% CWE-74 · Injection
6.5CVSS 3.1 base score, v2 6.4
18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
6References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

A 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 validation on the parameter redirect= available on multiple CGI components.

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

Affected products

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

References

LinkTags
https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31249 ExploitThird Party Advisory
https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/ ExploitThird Party Advisory
https://www.chiyu-tech.com/msg/message-Firmware-update-87.html Vendor Advisory
https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31249 ExploitThird Party Advisory
https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/ 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%6.1CVE-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%6.1CVE-2021-31641Chiyu-tech bf-430 firmware cross-site scripting vulnerabilityAn unauthenticated XSS vulnerability exists in several IoT devices from CHIYU Technology, including BF-630, BF-450M, BF-430, BF-431, BF631-W, BF830-W…EPSS 5.1%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%analysed10.0CVE-2025-20337Cisco ISE API input validation flaw allows unauthenticated root RCECisco ISE and ISE-PIC fail to properly validate user-supplied input in a specific API, letting an unauthenticated remote attacker execute arbitrary c…KEVEPSS 68%analysed10.0CVE-2025-20281Cisco ISE API unauthenticated remote code executionCisco ISE and ISE-PIC fail to properly validate user-supplied input in a specific API, allowing a crafted request to reach the underlying operating s…KEVEPSS 98%analysed7.2CVE-2022-43769Hitachi Vantara Pentaho BA Server Spring Template InjectionHitachi Vantara Pentaho Business Analytics Server before 9.4.0.1 and 9.3.0.2, including 8.3.x, allows certain web services to set property values con…KEVEPSS 98%analysed9.8CVE-2023-22527Atlassian Confluence Data Center and Server template injection RCEOlder versions of Confluence Data Center and Server contain a template injection flaw (CWE-74) that lets an unauthenticated attacker execute code on …KEVEPSS 100%analysed

Source: NIST National Vulnerability Database (record CVE-2021-31249), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.