What’s Vulnerable › Vulnerabilities

CVE-2021-37151

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-09-01 · updated 2026-06-17
• Weakness: CWE-203

Description

CyberArk Identity 21.5.131, when handling an invalid authentication attempt, sometimes reveals whether the username is valid. In certain authentication policy configurations with MFA, the API response length can be used to differentiate between a valid user and an invalid one (aka Username Enumeration). Response differentiation enables attackers to enumerate usernames of valid application users. Attackers can use this information to leverage brute-force and dictionary attacks in order to discover valid account information such as passwords.

Affected products

• CyberArk Identity Management: before 21.11.133 — fixed in 21.11.133

How to fix

Upgrade to a fixed version: CyberArk Identity Management 21.11.133. Check the vendor advisory for mitigations.

References

• https://www.cyberark.com/products/
• https://www.gov.il/en/departments/faq/cve_advisories
• https://www.cyberark.com/products/
• https://www.gov.il/en/departments/faq/cve_advisories

Get alerted when CVE-2021-37151 or the next vulnerability affects your stack