VulnerabilityModified

CVE-2021-31251

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…

CRITICAL 9.8EPSS 35.7%

Does this matter?

EPSS puts the probability of exploitation in the next 30 days at 35.7%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.

Description

CVSS 3.1: 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS: 35.71% probability · 98th percentile
CISA KEV: Not listed
Weakness: CWE-287
Affected: chiyu-tech/bf-430 firmware · chiyu-tech/bf-431 firmware · chiyu-tech/bf-450m firmware · chiyu-tech/semac s2 firmware · chiyu-tech/semac d1 firmware · chiyu-tech/semac d2 firmware · chiyu-tech/semac d4 firmware · chiyu-tech/semac s3v3 firmware · chiyu-tech/semac d2 n300 firmware · chiyu-tech/semac s1 osdp firmware
Source: cve@mitre.org

References

https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31251Exploit, Third Party Advisory
https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/#.YLqK1KhKguUExploit, 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-2021-31251Exploit, Third Party Advisory
https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/#.YLqK1KhKguUExploit, Third Party Advisory
https://www.chiyu-tech.com/msg/message-Firmware-update-87.htmlVendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.