CVE-2021-31249

Name: CVE-2021-31249
Creator: NVD / NIST
Published: 2021-06-04T21:15:07.463+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 18.00%

Last modified Jun 17, 2026

CVE-2021-31249 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 18.00% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

18.00%

96.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-74

Affected Software

Vendor	Product	Versions
Chiyu-Tech	Bf-430 Firmware	All versions
Chiyu-Tech	Bf-431 Firmware	All versions
Chiyu-Tech	Bf-450m Firmware	All versions

References

https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31249Exploit, Third Party Advisory
https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/Exploit, Third Party Advisory
https://www.chiyu-tech.com/msg/message-Firmware-update-87.htmlVendor Advisory
https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31249Exploit, Third Party Advisory
https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/Exploit, Third Party Advisory
https://www.chiyu-tech.com/msg/message-Firmware-update-87.htmlVendor Advisory

Timeline

Published: Jun 4, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-31249?

How severe is CVE-2021-31249?

CVE-2021-31249 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 18.00% probability of exploitation in the next 30 days.

How do I fix CVE-2021-31249?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-31249?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST