CVE-2021-20164Network attack vector

SMB credential disclosure via plaintext configuration page

Published Dec 30, 2021 · Updated Aug 3, 2024

Information disclosure in TRENDnet TEW-827DRU 2.08B01 allows remote authenticated users to read all configured SMB credentials. The smbserver.asp management page renders every SMB username and password in plaintext instead of protecting stored credential values. Administrator-level web access and configured SMB users are required; the reported consequence is disclosure of those credentials only.

CVSS severity4.9
Medium
EPSS probability0.73%
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 2.08B01 allows remote authenticated users to read all configured SMB credentials. The smbserver.asp management page renders every SMB username and password in plaintext instead of protecting stored credential values. Administrator-level web access and configured SMB users are required; the reported consequence is disclosure of those credentials only.

The record

CVE
CVE-2021-20164
Published
Dec 30, 2021
Updated
Aug 3, 2024
Vendor
TRENDnet
Product
TEW-827DRU
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-827DRUversion=2.08B01

Published CVSS scores

4.0NIST NVDAV:N/AC:L/Au:S/C:P/I:N/A:N
4.9NIST NVDCVSS: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.

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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.

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Technologies

Your stack

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Your stack

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