CVE-2021-46434Public exploitNetwork attack vector

Account discovery via distinguishable login errors

Published Mar 28, 2022 · Updated Aug 4, 2024

Username enumeration in EMQ X Dashboard 3.0.0 allows remote attackers to identify valid accounts through the login API. The /api/v3/auth handler returns “Password Error” for an existing username with a wrong password but “Username Not Found” for an unknown username. Network access to the Dashboard login endpoint is sufficient; the disclosed account validity can support credential attacks but does not itself expose passwords or grant access.

CVSS severity5.3
Medium
EPSS probability0.87%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Username enumeration in EMQ X Dashboard 3.0.0 allows remote attackers to identify valid accounts through the login API. The /api/v3/auth handler returns “Password Error” for an existing username with a wrong password but “Username Not Found” for an unknown username. Network access to the Dashboard login endpoint is sufficient; the disclosed account validity can support credential attacks but does not itself expose passwords or grant access.

The record

CVE
CVE-2021-46434
Published
Mar 28, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1087
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 28, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1087Account Discovery

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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