---
id: CVE-2021-27328
title: Yeastar NeoGate TG400 91.3.0.3 devices are affected by Directory Traversal
summary: >-
  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.
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-22
vendor: yeastar
product: neogate_tg400_firmware
affected:
  - neogate_tg400_firmware = 91.3.0.3
published: '2021-02-19'
updated: '2026-07-05'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-27328'
references:
  - url: >-
      http://packetstormsecurity.com/files/161560/Yeastar-TG400-GSM-Gateway-91.3.0.3-Path-Traversal.html
    label: cve@mitre.org
  - url: 'https://github.com/SQSamir/CVE-2021-27328'
    label: cve@mitre.org
  - url: >-
      http://packetstormsecurity.com/files/161560/Yeastar-TG400-GSM-Gateway-91.3.0.3-Path-Traversal.html
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://yeastar.com'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://github.com/SQSamir/CVE-2021-27328'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - exploit-available
epss: 0.06356
epssPercentile: 0.9339
ingestedAt: '2026-07-05T02:00:01.410Z'
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/SQSamir/CVE-2021-27328'
  checkedAt: '2026-09-25T08:20:38.435Z'
exploitAvailable: true
---

## Overview

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.

## Affected

- `neogate_tg400_firmware = 91.3.0.3`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.