CVE:CVE-2021-31642
CNNVD:CNNVD-202106-088
Chiyu CHIYU BF-430是中国台湾七友科技（Chiyu）公司的一款为门禁、考勤系统等设备提供通讯的联网服务器。 
CHIYU Technology IoT devices 存在安全漏洞，该漏洞源于出现整数溢出后存在拒绝服务状态。攻击者可利用该漏洞在页面参数上发送一个意外的整数(> 32位)来探测，这会使门户网站崩溃。以下产品及版本受到影响：BIOSENSE, Webpass, and BF-630, BF-631, SEMAC。
solution:Upgrade chiyu-tech semac_s2_firmware to a higher version than -; Upgrade chiyu-tech semac_d1_firmware to a higher version than -; Upgrade chiyu-tech semac_d2_firmware to a higher version than -; Upgrade chiyu-tech semac_d4_firmware to a higher version than -; Upgrade chiyu-tech semac_s3v3_firmware to a higher version than -; Upgrade chiyu-tech semac_d2_n300_firmware to a higher version than -; Upgrade chiyu-tech semac_s1_osdp_firmware to a higher version than -; Upgrade chiyu-tech bf-631_firmware to a higher version than -; Upgrade chiyu-tech bf-630_firmware to a higher version than -; Upgrade chiyu-tech webpass_firmware to a higher version than -; Upgrade chiyu-tech biosense_firmware to a higher version than -