CVE-2021-3632Network attack vector

Account takeover via unauthorized WebAuthn registration

Published Aug 26, 2022 · Updated Aug 3, 2024

Improper authentication in Red Hat build of Keycloak before 15.1.0 allows remote attackers to register a security key via passwordless WebAuthn. The WebAuthn passwordless authenticator permits device enrollment when an account has no existing passwordless credential, instead of requiring an already authenticated setup action. The flow requires interaction with the login process and can let an attacker capture the account by becoming its first registered security device.

CVSS severity7.5
High
EPSS probability1.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Red Hat build of Keycloak before 15.1.0 allows remote attackers to register a security key via passwordless WebAuthn. The WebAuthn passwordless authenticator permits device enrollment when an account has no existing passwordless credential, instead of requiring an already authenticated setup action. The flow requires interaction with the login process and can let an attacker capture the account by becoming its first registered security device.

The record

CVE
CVE-2021-3632
Published
Aug 26, 2022
Updated
Aug 3, 2024
Vendor
Red Hat
Product
Red Hat build of Keycloak
Classifications
CWE-287, T1098
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 26, 2022CVE 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=Fixed in v15.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Red Hat · Red Hat build of Keycloakversion=Fixed in v15.1.0

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
T1098Account Manipulation

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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