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CVE-2025-20384

MediumPublished

Unauthenticated Log Injection in Splunk Enterprise

Published: Dec 3, 2025
Updated: Dec 3, 2025
Assigning CNA: cisco
Evidence observed: Aug 8, 2026

Primary CVSS

5.3/ 10Medium

nvd · CVSS 3.1

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

EPSS probability estimate

0.4%

Low · next 30 days

Percentile: 32.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

In Splunk Enterprise versions below 10.0.1, 9.4.6, 9.3.8, and 9.2.10, and Splunk Cloud Platform versions below 10.1.2507.4, 10.0.2503.6, and 9.3.2411.117.125, an unauthenticated attacker can inject American National Standards Institute (ANSI) escape codes into Splunk log files due to improper validation at the /en-US/static/ web endpoint. This may allow them to poison, forge, or obfuscate sensitive log data through specially crafted HTTP requests, potentially impacting log integrity and detection capabilities.

Sources

CVE-2025-20384PoC
Proof-of-concept demonstrating log injection and poisoning in Splunk via crafted URL parameters, highlighting OWASP log injection risks.

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