CVE-2021-3422
The lack of validation of a key-value field in the Splunk-to-Splunk protocol results in a denial-of-service in Splunk Enterprise instances configured to index Universal Forwarder traffic. The vulnerability impacts Splunk Enterprise versions before 7.3.9, 8.0 versions before 8.0.9, and 8.1 versions before 8.1.3. It does not impact Universal Forwarders. When Splunk forwarding is secured using TLS or a Token, the attack requires compromising the certificate or token, or both. Implementation of either or both reduces the severity to Medium.
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:N/A:H- Weakness (CWE)
- CWE-125
- EPSS score
- 0.6% (48th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2021-26750)
- Published
- March 25, 2022
- NVD last modified
- June 17, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2021-26750 in the EU Vulnerability Database. Last updated in EUVD on August 3, 2024.
View on the EU Vulnerability DatabaseAffected products
- splunk / splunk
Certified products that may be affected
2 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.
- Splunk Enterprise 8.1 - Splunk, Inc. - Common Criteria CCEVS-VR-VID-11108-2021 - archived
- Splunk Enterprise 6.4.5 - Splunk, Inc. - Common Criteria CCEVS-VR-VID-10780 - archived
References
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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