CVE-2021-27328
Yeastar NeoGate TG400 91.3.0.3 devices are affected by Directory Traversal. An authenticated user...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2021-27328- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - CVSS 2.0
- 4.0 Medium
AV:N/AC:L/Au:S/C:P/I:N/A:N - Weakness
- CWE-22
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2021-27328- Updated
- 2026-11-02
EUVDEUVD-2021-14088 No score
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.
- Record
EUVD-2021-14088- Updated
- 2026-11-02
GitHub AdvisoriesGHSA-9fhx-hcwq-8qwv
Yeastar NeoGate TG400 91.3.0.3 devices are affected by Directory Traversal. An authenticated user...
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.
- Record
GHSA-9fhx-hcwq-8qwv- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-22
- Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | SQSamir/CVE-2021-27328 | 2021-02-19 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-27328 is a medium vulnerability (CVSS 6.5) in Yeastar Neogate Tg400 Firmware, published February 19, 2021. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 6.36%, the 93rd percentile. No source names a fixed version.