CVE-2021-27328

MEDIUM

Yeastar NeoGate TG400 <91.3.0.3 - Path Traversal

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2021-27328. PoCs published by SQSamir.

AI-analyzed exploit summary This PoC demonstrates a path traversal vulnerability in Yeastar TG400 GSM Gateway version 91.3.0.3, allowing unauthorized access to sensitive files like /etc/passwd and firmware decryption passwords.

Description

Yeastar NeoGate TG400 91.3.0.3 devices are affected by Directory Traversal. An authenticated user can decrypt firmware and can read sensitive information, such as a password or decryption key.

Exploits (1)

nomisec WORKING POC
by SQSamir · poc
https://github.com/SQSamir/CVE-2021-27328

This PoC demonstrates a path traversal vulnerability in Yeastar TG400 GSM Gateway version 91.3.0.3, allowing unauthorized access to sensitive files like /etc/passwd and firmware decryption passwords.

Classification
Working Poc 90%
Attack Type
Info Leak
Complexity
Trivial
Reliability
Reliable
Target: Yeastar TG400 GSM Gateway 91.3.0.3
No auth needed
Prerequisites: Network access to the target device
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (3)

Core 3
Core References
Vendor Advisory x_refsource_misc
http://yeastar.com
Exploit, Third Party Advisory x_refsource_misc
https://github.com/SQSamir/CVE-2021-27328

Scores

CVSS v3 6.5
EPSS 0.0900
EPSS Percentile 94.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Details

CWE
CWE-22
Status published
Products (1)
yeastar/neogate_tg400_firmware 91.3.0.3
Published Feb 19, 2021
Tracked Since Feb 18, 2026