AUGUST 5, 2026
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Case File

CVE-2021-37151

MEDIUM · CVSS 5.3 EPSS 0.85%

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-09-01 · Last synced 2026-08-04

CyberRota Analysis

This is a medium severity vulnerability with a CVSS score of 5.3. See the original NVD description below for full technical details.

CVE
CVE-2021-37151
Severity
MEDIUM
CVSS
5.3
EPSS
0.85%

Original NVD 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.

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