CVE-2021-20163Network attack vector

FTP credential disclosure via plaintext management page

Published Dec 30, 2021 · Updated Aug 3, 2024

Information disclosure in TRENDnet TEW-827DRU firmware 2.08B01 allows remote authenticated users to read all FTP credentials. The ftpserver.asp management page renders every configured FTP username and password in plaintext rather than masking or withholding stored secrets. Administrative access to the router management interface is required, and successful access exposes credentials for every configured FTP account.

CVSS severity4.9
Medium
EPSS probability0.79%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in TRENDnet TEW-827DRU firmware 2.08B01 allows remote authenticated users to read all FTP credentials. The ftpserver.asp management page renders every configured FTP username and password in plaintext rather than masking or withholding stored secrets. Administrative access to the router management interface is required, and successful access exposes credentials for every configured FTP account.

The record

CVE
CVE-2021-20163
Published
Dec 30, 2021
Updated
Aug 3, 2024
Vendor
TRENDnet
Product
TEW-827DRU Firmware
Classifications
CWE-522, T1555
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Dec 30, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.08B01

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

TRENDnet · TEW-827DRU Firmwareversion=2.08B01

Published CVSS scores

4.0NVDAV:N/AC:L/Au:S/C:P/I:N/A:N
4.9NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-522Insufficiently Protected Credentials
T1555Credentials from Password Stores

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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