CVE-2021-27210Public exploitNetwork attack vector

Credential disclosure via unauthorized USER_CFG retrieval

Published Feb 13, 2021 · Updated Aug 3, 2024

Information disclosure in TP-Link Archer C5v 1.7_181221 allows remote authenticated users to retrieve cleartext credentials. The /cgi?1&5 handler returns the device's USER_CFG record, which stores all account credentials, including the root credential, in cleartext. Any authenticated user on the local network can read the credentials despite lacking authorization, exposing every configured account.

CVSS severity6.5
Medium
EPSS probability0.84%
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 TP-Link Archer C5v 1.7_181221 allows remote authenticated users to retrieve cleartext credentials. The /cgi?1&5 handler returns the device's USER_CFG record, which stores all account credentials, including the root credential, in cleartext. Any authenticated user on the local network can read the credentials despite lacking authorization, exposing every configured account.

The record

CVE
CVE-2021-27210
Published
Feb 13, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-312, T1552
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 13, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
4.0NIST NVDAV:N/AC:L/Au:S/C:P/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-312Cleartext Storage of Sensitive Information
T1552Unsecured Credentials

Public exploit references

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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