Vulnerability · Published Jun 4, 2021 · Assigned by mitre
CVE-2021-31251
Critical 9.8
In plain English
A critical-severity security flaw in the affected software. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 35.7% (higher than 98% of all known vulnerabilities).
Severity (CVSS NVD)9.8Critical
Exploit odds (30 days)35.7%top 1.5% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
An 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 a privileged connection with the target device by supplying a specially malformed request and an attacker may force the remote telnet server to believe that the user has already authenticated.
Affected products (as reported)
References
- https://www.chiyu-tech.com/msg/message-Firmware-update-87.html x_refsource_CONFIRM
- https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31251 x_refsource_MISC
- https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/#.YLqK1KhKguU x_refsource_MISC