Cyber Resilience

CVE-2025-20384

Medium

Published: 03 December 2025

Published
03 December 2025
Modified
05 December 2025
KEV Added
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Patch
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CVSS Score v3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS Score 0.0012 30.3th percentile
Risk Priority 11 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-20384 is a medium-severity Improper Output Neutralization for Logs (CWE-117) vulnerability in Splunk Splunk. Its CVSS base score is 5.3 (Medium).

Operationally, ranked at the 30.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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…

more

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.

CWE(s)
CWE-117

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

splunk
splunk
10.0.0 · 9.2.0 — 9.2.10 · 9.3.0 — 9.3.8 · 9.4.0 — 9.4.6
splunk
splunk cloud platform
9.3.2411 — 9.3.2411.117 · 10.0.2503 — 10.0.2503.6 · 10.1.2507 — 10.1.2507.4

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

AU-1 Policy and Procedures
addresses: CWE-117

Policy and procedures require sanitization and neutralization when generating audit logs to avoid injection issues.

SI-15 Information Output Filtering
addresses: CWE-117

Requiring output to conform to expected content prevents unneutralized data from reaching logs.

References