CVE-2021-31249
A CRLF injection vulnerability was found on BF-430, BF-431, and BF-450M TCP/IP Converter devices...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2021-31249- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N - CVSS 2.0
- 6.4 Medium
AV:N/AC:L/Au:N/C:P/I:P/A:N - Weakness
- CWE-74
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2021-31249- Updated
- 2026-11-02
EUVDEUVD-2021-18161 No score
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.
- Record
EUVD-2021-18161- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-7ccm-338c-fv4r
A CRLF injection vulnerability was found on BF-430, BF-431, and BF-450M TCP/IP Converter devices...
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.
- Record
GHSA-7ccm-338c-fv4r- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N - Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| Nuclei | CHIYU TCP/IP Converter - Carriage Return Line Feed Injection |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, Nuclei, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-31249 is a medium vulnerability (CVSS 6.5) in Chiyu-tech Bf-430 Firmware, published June 4, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 18.0%, the 97th percentile. No source names a fixed version.