Critical severity9.8NVD Advisory· Published Jun 4, 2021· Updated Jun 17, 2026
CVE-2021-31251
CVE-2021-31251
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
13- 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_d1_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:chiyu-tech:semac_d2_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:chiyu-tech:semac_d2_n300_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:chiyu-tech:semac_d4_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:chiyu-tech:semac_s1_osdp_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:chiyu-tech:semac_s2_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:chiyu-tech:semac_s3v3_firmware:-:*:*:*:*:*:*:*
- CHIYU Technology Inc/TCP/IP Converterdescription
Patches
Vulnerability mechanics
References
3- gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devicesnvdExploitThird Party Advisory
- seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/nvdExploitThird Party Advisory
- www.chiyu-tech.com/msg/message-Firmware-update-87.htmlnvdVendor Advisory
News mentions
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