CVE-2021-31249

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Se encontró una vulnerabilidad de inyección de tipo CRLF en los dispositivos convertidores TCP/IP BF-430, BF-431 y BF-450M de CHIYU Technology Inc debido a una falta de comprobación en el parámetro redirect= disponible en múltiples componentes CGI

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-04-15 CVE Reserved
2021-06-04 CVE Published
2024-08-03 CVE Updated
2024-08-03 First Exploit
2025-02-19 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

CAPEC

References (3)

URL	Tag	Source

URL	Date	SRC
https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31249	2024-08-03
https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks	2024-08-03

URL	Date	SRC

URL	Date	SRC
https://www.chiyu-tech.com/msg/message-Firmware-update-87.html	2023-08-08

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Chiyu-tech Search vendor "Chiyu-tech"	Bf-430 Firmware Search vendor "Chiyu-tech" for product "Bf-430 Firmware"	-	-	Affected	in	Chiyu-tech Search vendor "Chiyu-tech"	Bf-430 Search vendor "Chiyu-tech" for product "Bf-430"	-	-	Safe
Chiyu-tech Search vendor "Chiyu-tech"	Bf-431 Firmware Search vendor "Chiyu-tech" for product "Bf-431 Firmware"	-	-	Affected	in	Chiyu-tech Search vendor "Chiyu-tech"	Bf-431 Search vendor "Chiyu-tech" for product "Bf-431"	-	-	Safe
Chiyu-tech Search vendor "Chiyu-tech"	Bf-450m Firmware Search vendor "Chiyu-tech" for product "Bf-450m Firmware"	-	-	Affected	in	Chiyu-tech Search vendor "Chiyu-tech"	Bf-450m Search vendor "Chiyu-tech" for product "Bf-450m"	-	-	Safe