Vulnerability in Chiyu-Tech Bf-430
CVE-2021-31249
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.180 (97.2th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 97.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.180 · newest: 0.180 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-… (Exploit, Third Party Advisory)
- www.chiyu-tech.com/msg/message-Firmware-update-87.html (Vendor Advisory)
- gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-31249?
- CVE-2021-31249 is a medium-severity vulnerability in Chiyu-Tech Bf-430, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.5/10. Published 2021-06-04.
- How severe is CVE-2021-31249?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2021-31249 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.