Username enumeration via authentication response length
Published Sep 1, 2021 · Updated Aug 4, 2024
Username enumeration in CyberArk Identity 21.5.131 allows remote attackers to identify valid application users through authentication API responses. The invalid-attempt path returns API responses whose lengths vary according to whether the submitted username exists. No account is required, but a qualifying MFA policy configuration must be enabled; exposed usernames facilitate targeted password guessing without revealing passwords directly.
Summary
What happened
Username enumeration in CyberArk Identity 21.5.131 allows remote attackers to identify valid application users through authentication API responses. The invalid-attempt path returns API responses whose lengths vary according to whether the submitted username exists. No account is required, but a qualifying MFA policy configuration must be enabled; exposed usernames facilitate targeted password guessing without revealing passwords directly.
The record
- CVE
- CVE-2021-37151
- Published
- Sep 1, 2021
- Updated
- Aug 4, 2024
- Vendor
- CyberArk
- Product
- CyberArk Identity
- Classifications
- CWE-203, CAPEC-189, T1087.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 1, 2021CVE publishedPublication date reported by the CVE source.
- 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?
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- Affected versionversion=21.5.131
What conditions does exploitation require?
What is affected?
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.
Weakness, pattern, technique
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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