CVE-2022-39228Network attack vector

Username enumeration via account-lockout behavior

Published Mar 1, 2023 · Updated Mar 7, 2025

Observable response discrepancy in the token login endpoint in vantage6 before 3.8.0 allows remote attackers to enumerate valid usernames. The login path increments failed-attempt counters only after username_exists succeeds, so repeated invalid passwords cause an account-lockout state only for registered names. No authentication or user interaction is required, but enumeration requires repeated login attempts and exposes account existence while temporarily blocking the tested valid account.

CVSS severity6.5
Medium
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Observable response discrepancy in the token login endpoint in vantage6 before 3.8.0 allows remote attackers to enumerate valid usernames. The login path increments failed-attempt counters only after username_exists succeeds, so repeated invalid passwords cause an account-lockout state only for registered names. No authentication or user interaction is required, but enumeration requires repeated login attempts and exposes account existence while temporarily blocking the tested valid account.

The record

CVE
CVE-2022-39228
Published
Mar 1, 2023
Updated
Mar 7, 2025
Vendor
vantage6
Product
vantage6
Classifications
CWE-203, CWE-204, T1589.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 1, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 7, 2025Record 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=< 3.8.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

vantage6 · vantage6version=< 3.8.0

Published CVSS scores

5.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-203Observable Discrepancy
CWE-204Observable Response Discrepancy
T1589.001Gather Victim Identity Information: Credentials

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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