What’s Vulnerable › Vulnerabilities

CVE-2022-43572: Indexing blockage via malformed data sent through S2S or HEC protocols in Splunk Enterprise

• Severity: medium (CVSS 6.5 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: 2022-11-04 · updated 2026-06-17
• Weakness: CWE-400

Description

In Splunk Enterprise versions below 8.2.9, 8.1.12, and 9.0.2, sending a malformed file through the Splunk-to-Splunk (S2S) or HTTP Event Collector (HEC) protocols to an indexer results in a blockage or denial-of-service preventing further indexing.

Affected products

• Splunk Enterprise: from 8.1.0 before 8.1.12; from 8.2.0 before 8.2.9; from 9.0.0 before 9.0.2 — fixed in 8.1.12, 8.2.9, 9.0.2
• Splunk Cloud Platform: before 9.0.2209 — fixed in 9.0.2209

How to fix

Upgrade to a fixed version: Splunk Enterprise 8.1.12, 8.2.9, 9.0.2; Splunk Cloud Platform 9.0.2209. Check the vendor advisory for mitigations.

References

• https://www.splunk.com/en_us/product-security/announcements/svd-2022-1111.html
• https://www.splunk.com/en_us/product-security/announcements/svd-2022-1111.html

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