CVE-2025-22870 is a medium severity vulnerability identified in the matching of hosts against proxy patterns. This vulnerability allows an IPv6 zone ID to be improperly treated as a hostname component, which can result in unintended proxy bypasses. Specifically, when the NO_PROXY environment variable is configured with a pattern such as "*.example.com", requests to an address like "[::1%25.example.com]:80" will incorrectly match, leading to the request not being proxied as intended.
The CVSS score for this vulnerability is 4.4, indicating a medium severity level. This score reflects potential impacts on confidentiality, integrity, and availability, which are categorized as low, none, and low, respectively. The existence of this vulnerability poses a risk to organizations as it could lead to the circumvention of proxy protections, potentially exposing sensitive data.
As of the current date, there is confirmed exploitability associated with this vulnerability. Organizations should prioritize addressing this vulnerability in their patch management processes to mitigate risks associated with potential exploitation.
Given the nature of this vulnerability, it is crucial for organizations to assess their usage of proxy settings and the implications of IPv6 configurations. Immediate attention to remediation is advised to prevent unauthorized access or data exposure resulting from this issue.
Vulnerability Details
The official description of CVE-2025-22870 outlines the improper treatment of IPv6 zone IDs within host matching against proxy patterns. This misconfiguration can lead to an attacker bypassing proxy settings, potentially exposing sensitive resources. The vulnerability is categorized under CWE-115, which pertains to the improper handling of a critical resource.
Published on March 12, 2025, the vulnerability has a CVSS 3.1 score of 4.4, indicating medium severity. The associated attack vector is local, requiring low privileges, with no user interaction necessary. The vulnerability is currently awaiting further analysis regarding its full impact and mitigation strategies.
Technical Analysis
The root cause of CVE-2025-22870 stems from the way IPv6 zone IDs are parsed in the context of proxy configuration. When an IPv6 address is used with a zone ID, the system might mistakenly interpret it as a valid hostname, leading to a situation where requests are not correctly proxied. This vulnerability falls under the category of proxy bypass vulnerabilities, which can expose local services to external access.
The attack vector for this vulnerability is classified as local, meaning an attacker must have access to the local network to exploit the vulnerability. The complexity of the attack is low, and it requires minimal privileges to initiate. Notably, no user interaction is needed, allowing the attacker to exploit the vulnerability without alerting the target.
The impacts of this vulnerability can be categorized as follows: confidentiality impact is low, as sensitive information may be exposed; integrity impact is none; and availability impact is low, which could lead to service disruptions if exploited. This assessment highlights the importance of addressing the vulnerability promptly.
Risk & Impact Analysis
The real-world risk associated with CVE-2025-22870 is significant, especially for organizations relying on proxy settings for security. The improper treatment of IPv6 zone IDs can lead to proxy bypass, allowing attackers to access services that are intended to be protected. This risk is exacerbated in environments where sensitive data is transmitted over networks without sufficient security measures.
The potential blast radius for this vulnerability is considerable since it impacts the ability of proxies to enforce security policies effectively. Organizations may find themselves exposed to various threats, including unauthorized data access and potential service disruptions.
Given the CVSS score of 4.4, organizations should assess this vulnerability with a medium level of urgency. It should be addressed in their priority patch cycle to ensure that existing proxy configurations do not inadvertently expose critical resources.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
Currently, there are no specific affected products or versions listed for CVE-2025-22870. Organizations should assume that all versions prior to the implementation of a fix may be vulnerable.
Mitigation & Remediation
Organizations should prioritize patching against CVE-2025-22870. Regularly updating software and maintaining awareness of proxy configurations can help mitigate the risks associated with this vulnerability. Consider reviewing the NO_PROXY environment variable settings to ensure they are accurately configured to avoid unintended matches.
For further guidance on managing vulnerabilities, organizations can refer to our vulnerability management program design resource.
Detection Guidance
To detect potential exploitation of CVE-2025-22870, organizations should monitor network logs for unusual proxy behavior, particularly with IPv6 requests that match NO_PROXY patterns. Additionally, detecting attempts to access sensitive services via IP addresses that should be proxied can indicate exploitation.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2025-22870 lies in its representation of the challenges associated with IPv6 adoption and legacy proxy configurations. Security teams must stay vigilant regarding the configuration of networking protocols and their implications for security.
As IPv6 becomes more prevalent, understanding how it interacts with existing security measures is critical. This vulnerability serves as a reminder for organizations to regularly review their security postures and ensure that they account for modern networking standards.
For further insights into enhancing security in the context of cloud and application environments, organizations may find value in our cloud penetration testing guide and web application penetration testing resources.
Lastly, organizations should consider implementing a penetration testing methodology to regularly evaluate their defenses against emerging vulnerabilities.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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