CVE-2025-0588 is a medium-severity vulnerability affecting Octopus Server. This vulnerability allows a user with sufficient access to set custom headers in all server responses. By submitting a specifically crafted referrer header, the user could ensure that all subsequent server responses would return 500 errors, rendering the site mostly unusable. The ability to control the denial of service state with a valid CSRF token while preventing the generation of new CSRF tokens poses significant risks.
The severity level of this vulnerability is classified as medium with a CVSS score of 5.9. Organizations using affected versions of Octopus Server should be aware of the potential for service disruption and unauthorized access due to the manipulation of server responses. Given the implications for availability, organizations should prioritize patching immediately.
As of the latest information, there is no confirmed public exploit for this vulnerability, and it is not listed in the Known Exploited Vulnerabilities (KEV) catalog. However, the potential for denial of service through header manipulation underscores the need for immediate attention.
Organizations should address this vulnerability in their priority patch cycle to mitigate risks associated with service disruptions and ensure operational continuity.
Vulnerability Details
The official description of CVE-2025-0588 indicates that in affected versions of Octopus Server, a user with sufficient access can set custom headers causing all server responses to return 500 errors. The vulnerability is classified under CWE-113, which pertains to improper control of a resource through its lifetime.
The CVSS 4.0 base score is 5.9, indicating a medium severity, with an attack vector of NETWORK, high attack complexity, and the requirement for high privileges. The availability impact is classified as high, making this a critical issue for organizations relying on Octopus Server.
The vulnerability was published on February 11, 2025, and its status is analyzed. Organizations should review the affected versions to determine their risk exposure.
Technical Analysis
The root cause of this vulnerability lies in the improper handling of custom headers in Octopus Server. Attackers can exploit this by submitting a specially crafted referrer header, leading to controlled denial of service through consistent 500 errors. Since the attack vector is network-based, the complexity is considered high due to the requirement for high privileges, limiting potential exploitation to users with sufficient access.
There is no user interaction required for this attack, and it impacts availability significantly. The attacker does not impact confidentiality or integrity, making the denial of service the primary concern.
Risk & Impact Analysis
Risk to organizations includes significant operational disruption due to the denial of service that could impact users and services relying on Octopus Server. The potential for service downtime can lead to loss of productivity and could affect business continuity, especially for services critical to business operations.
With a CVSS score of 5.9, organizations must act promptly and prioritize remediation efforts. Patching should be integrated into the next cycle to prevent exploitation of this vulnerability.
The impact radius is considerable, as any user with sufficient privileges can exploit this vulnerability, leading to potential disruptions affecting all users of the system.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
Affected versions of Octopus Server include all versions starting from 2020.1.0 up to but not including 2024.3.13097, and also from 2024.4.401 up to but not including 2024.4.7091. Organizations running these versions should take immediate action to patch their systems.
Mitigation & Remediation
Organizations should implement the latest patches provided by Octopus to remediate this vulnerability. The latest version should be determined based on the vendor's advisory.
For organizations unable to immediately apply patches, consider implementing network controls to restrict access to the affected components and monitor for abnormal behavior. Continuous security testing can help identify vulnerabilities in the application.
Organizations should also engage in continuous penetration testing to ensure ongoing security measures are effective.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor logs for unusual patterns, particularly around the handling of referrer headers. Behavioral anomalies that suggest denial of service attacks should be investigated promptly.
Network signatures can be developed to alert on suspicious traffic patterns indicative of attempts to manipulate server responses.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2025-0588 lies in its demonstration of how improper header handling can lead to service disruptions. This vulnerability reflects a pattern in application security where user input is not adequately validated, leading to critical availability issues.
Security teams should take this opportunity to review their security controls surrounding header management and ensure that input validation processes are robust.
Implementing a thorough penetration testing methodology can help identify weaknesses in application logic before they can be exploited.
Additionally, organizations should consider adopting a vulnerability management program that focuses on continuous monitoring and assessment.
Cloud penetration testing can also provide insights into potential vulnerabilities in cloud environments, ensuring comprehensive security coverage.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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