Vulnerability Details : 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 attacker may force the remote telnet server to believe that the user has already authenticated.
Vulnerability category: BypassGain privilege
Products affected by CVE-2021-31251
- cpe:2.3:o:chiyu-tech:bf-430_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:chiyu-tech:bf-431_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:chiyu-tech:bf-450m_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:chiyu-tech:semac_s2_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:chiyu-tech:semac_d1_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:chiyu-tech:semac_d2_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:chiyu-tech:semac_d4_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:chiyu-tech:semac_s3v3_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:chiyu-tech:semac_d2_n300_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:chiyu-tech:semac_s1_osdp_firmware:-:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-31251
6.97%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 94 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-31251
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.5
|
HIGH | AV:N/AC:L/Au:N/C:P/I:P/A:P |
10.0
|
6.4
|
NIST | |
|
9.8
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
3.9
|
5.9
|
NIST |
CWE ids for CVE-2021-31251
-
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-31251
-
https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31251
CHIYU IoT devices - Red Teaming and Malware AnalysisExploit;Third Party Advisory
-
https://www.chiyu-tech.com/msg/message-Firmware-update-87.html
Firmware updateVendor Advisory
-
https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/#.YLqK1KhKguU
Dancing in the IoT: CHIYU devices vulnerable to remote attacksExploit;Third Party Advisory
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