What’s Vulnerable › Vulnerabilities

CVE-2021-33845: Username enumeration through lockout message in REST API

• 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: 2022-05-06 · updated 2026-06-17
• Weakness: CWE-203

Description

The Splunk Enterprise REST API allows enumeration of usernames via the lockout error message. The potential vulnerability impacts Splunk Enterprise instances before 8.1.7 when configured to repress verbose login errors.

Affected products

• Splunk Enterprise: from 8.1.0 before 8.1.7 — fixed in 8.1.7

How to fix

Upgrade to a fixed version: Splunk Enterprise 8.1.7. Check the vendor advisory for mitigations.

References

• https://research.splunk.com/application/splunk_user_enumeration_attempt/
• https://www.splunk.com/en_us/product-security/announcements/svd-2022-0502.html
• https://research.splunk.com/application/splunk_user_enumeration_attempt/
• https://www.splunk.com/en_us/product-security/announcements/svd-2022-0502.html

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