CVE-2021-26253

Name: CVE-2021-26253
Creator: NVD / NIST
Published: 2022-05-06T17:15:08.443+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 0.75%

Last modified Jun 17, 2026

CVE-2021-26253 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. A potential vulnerability in Splunk Enterprise's implementation of DUO MFA allows for bypassing the MFA verification in Splunk Enterprise versions before 8.1.6. The potential vulnerability impacts Splunk Enterprise instances configured to use DUO MFA and does not impact or affect a DUO product or service.. EPSS estimates a 0.75% chance of exploitation in the next 30 days.

Description

A potential vulnerability in Splunk Enterprise's implementation of DUO MFA allows for bypassing the MFA verification in Splunk Enterprise versions before 8.1.6. The potential vulnerability impacts Splunk Enterprise instances configured to use DUO MFA and does not impact or affect a DUO product or service.

Metrics

CVSS 3.1

8.1/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.75%

50.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-287

Affected Software

Vendor	Product	Versions
Splunk	Splunk	>= 8.1.0, < 8.1.6

References

https://www.splunk.com/en_us/product-security/announcements/svd-2022-0504.htmlVendor Advisory
https://www.splunk.com/en_us/product-security/announcements/svd-2022-0504.htmlVendor Advisory

Timeline

Published: May 6, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-26253?

How severe is CVE-2021-26253?

CVE-2021-26253 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 0.75% probability of exploitation in the next 30 days.

How do I fix CVE-2021-26253?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-26253?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST