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CVE-2021-27328

26
FAUCET Score

CVE-2021-27328 is a directory traversal vulnerability affecting Yeastar NeoGate TG400 devices running firmware version 91.3.0.3. An authenticated attacker can exploit this to decrypt firmware and access sensitive information like passwords or decryption keys. Rated as Medium severity (CVSS 6.5), it requires authenticated access but has a high impact on confidentiality. There is currently no public exploit code (Metasploit, Nuclei, ExploitDB) and minimal community discussion or media coverage, indicating it is not actively exploited.

Impacted Technologies

VendorProductVersion(s)CPE
91.3.0.3CPE matchmatch criteria
cpe:2.3:o:yeastar:neogate_tg400_firmware:91.3.0.3:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
6.30%
Probability of exploitation in next 30 days
EPSS Percentile
92.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0630 is in the 98th percentile among its peer group of 21,957 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

packetstormsecurity.com / files/161560/Yeastar-TG400-GSM-Gateway-91.3.0.3-Path-Traversal.html
ExploitThird Party AdvisoryVDB Entry
github.com / SQSamir/CVE-2021-27328
ExploitThird Party Advisory