CVE-2025-20322 in Splunk
Summary
by MITRE • 07/07/2025
In Splunk Enterprise versions below 9.4.3, 9.3.5, 9.2.7, and 9.1.10, and Splunk Cloud Platform versions below 9.3.2411.104, 9.3.2408.113, and 9.2.2406.119, an unauthenticated attacker could send a specially-crafted SPL search command that could trigger a rolling restart in the Search Head Cluster through a Cross-Site Request Forgery (CSRF), potentially leading to a denial of service (DoS).The vulnerability requires the attacker to phish the administrator-level victim by tricking them into initiating a request within their browser. The attacker should not be able to exploit the vulnerability at will.See [How rolling restart works](https://docs.splunk.com/Documentation/Splunk/9.4.2/DistSearch/RestartSHC) for more information.
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Analysis
by VulDB Data Team • 07/21/2025
The vulnerability described in CVE-2025-20322 represents a significant security flaw in Splunk Enterprise and Splunk Cloud Platform deployments across multiple version ranges. This issue stems from a cross-site request forgery vulnerability that allows unauthenticated attackers to manipulate the search head cluster's operational state through carefully crafted SPL search commands. The vulnerability specifically affects versions prior to 9.4.3, 9.3.5, 9.2.7, and 9.1.10 for Splunk Enterprise, while Splunk Cloud Platform remains affected until versions 9.3.2411.104, 9.3.2408.113, and 9.2.2406.119. The attack vector requires social engineering to deceive administrative users into executing malicious requests within their browser context, making it a sophisticated targeting attack rather than a straightforward automated exploit.
The technical implementation of this vulnerability exploits the trust relationship between the Splunk web interface and authenticated sessions. When an administrator visits a malicious website or clicks on a crafted link that triggers a specific SPL search command, the CSRF attack can cause the search head cluster to initiate an unintended rolling restart process. This behavior occurs because the system does not adequately validate the origin of requests originating from the web interface, particularly when these requests involve cluster management operations. The vulnerability specifically targets the cluster restart functionality described in Splunk's official documentation, where a rolling restart is designed to maintain service availability during maintenance but becomes a DoS vector when triggered maliciously.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise the availability of critical monitoring and security operations within organizations relying on Splunk platforms. A successful exploitation can result in complete denial of service for search capabilities, disrupting incident response, log analysis, and security monitoring workflows that depend on the platform's search functionality. The rolling restart process, while intended to be a controlled maintenance operation, becomes a weaponized feature when manipulated by attackers. This attack scenario particularly threatens organizations that depend on Splunk for real-time threat detection and security operations, as the DoS condition can last for several minutes during the restart process, potentially masking security incidents or preventing timely responses to ongoing threats.
Organizations should implement multiple layers of defense to mitigate this vulnerability, beginning with immediate patching to the affected versions mentioned in the advisory. Network segmentation and access controls should be strengthened to limit exposure of administrative interfaces to untrusted networks. Browser-based security measures including content security policies and CSRF token validation should be enhanced to prevent unauthorized requests from being executed in administrative contexts. The vulnerability aligns with CWE-352, which specifically addresses cross-site request forgery flaws in web applications, and maps to ATT&CK technique T1190, which covers exploitation of vulnerabilities in web applications. Additionally, organizations should consider implementing web application firewalls and monitoring for unusual restart patterns in their search head clusters to detect potential exploitation attempts. Regular security awareness training for administrators can help prevent successful phishing campaigns that could lead to exploitation of this vulnerability.