CVE-2021-37151

2021-09-0112:35:08

INCD

www.cve.org

cyberark identity

authentication policy

mfa

api response length

username enumeration

brute-force attacks

AI Score

5.5

Confidence

High

EPSS

0.001

Percentile

38.7%

JSON

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.

CNA Affected

[
  {
    "product": "Identity",
    "vendor": "CyberArk",
    "versions": [
      {
        "status": "affected",
        "version": "21.5.131"
      }
    ]
  }
]

References

www.cyberark.com/products/

www.gov.il/en/departments/faq/cve_advisories