Is CVE-2021-31559 being actively exploited?

CVE-2021-31559 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2021-31559?

CVE-2021-31559 has a CVSS 3.1 base score of 7.5 (HIGH).

CVE-2021-31559

HIGH · CVSS 7.5EPSS 0.9%EU EUVD

A crafted request bypasses S2S TCP Token authentication writing arbitrary events to an index in Splunk Enterprise Indexer 8.1 versions before 8.1.5 and 8.2 versions before 8.2.1. The vulnerability impacts Indexers configured to use TCPTokens. It does not impact Universal Forwarders.

Key facts

CVSS score: 7.5 (v3.1)
Severity: HIGH
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness (CWE): CWE-288
EPSS score: 0.9% (59th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2021-18456)
Published: May 6, 2022
NVD last modified: June 17, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2021-18456 in the EU Vulnerability Database. Last updated in EUVD on August 3, 2024.

View on the EU Vulnerability Database

Affected products

splunk / splunk
splunk / splunk

Certified products that may be affected

1 FIPS 140 or Common Criteria certified product, from automated matching by sec-certs.org.

Splunk Enterprise 8.1 - Splunk, Inc. - Common Criteria CCEVS-VR-VID-11108-2021 - archived

References

https://www.splunk.com/en_us/product-security/announcements/svd-2022-0503.html(Vendor Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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