CVE-2025-9232 relates to an application utilizing the OpenSSL HTTP client API functions, which may trigger an out-of-bounds read when the 'no_proxy' environment variable is set, and the host portion of the HTTP URL is an IPv6 address. This vulnerability can potentially lead to a crash, resulting in a Denial of Service for the affected application.
The OpenSSL HTTP client API functions, while directly usable by applications, are also leveraged by the OCSP client functions and the Certificate Management Protocol (CMP) client implementation. However, the URLs used in these implementations are generally not under an attacker's control, which mitigates the risk.
The requirement for both an attacker-controlled URL and the specific environment variable makes this vulnerability less severe. The issue was classified as medium severity due to its characteristics, as it primarily results in application crashes rather than direct exploitation.
The vulnerable code was introduced in several patch releases, including versions 3.0.16, 3.1.8, 3.2.4, 3.3.3, 3.4.0, and 3.5.0. Importantly, the FIPS modules in these versions are not affected, as the HTTP client implementation lies outside the scope of the OpenSSL FIPS module.
Organizations should prioritize patching this vulnerability to maintain application stability. Although the risk of exploitation is low, any potential Denial of Service can disrupt services and impact user experience.
Vulnerability Details
The vulnerability allows for an out-of-bounds read under specific conditions, leading to application crashes. The CVSS score for this vulnerability is 5.9, which classifies it as medium severity. The affected product is OpenSSL, and the vulnerability was disclosed on September 30, 2025.
Technical Analysis
This vulnerability stems from improper handling of the 'no_proxy' environment variable in conjunction with IPv6 addresses. When the HTTP client API functions are invoked with these conditions, an out-of-bounds read can occur, leading to a crash. The attack vector is network-based, requiring no privileges or user interaction.
Risk & Impact Analysis
Risk to organizations includes potential service disruptions due to Denial of Service, particularly for applications that utilize the OpenSSL HTTP client API. The blast radius is limited, as the vulnerability requires specific conditions to be exploited. Organizations should assess their exposure and address this vulnerability in their patch cycles.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
This vulnerability affects OpenSSL versions 3.0.16, 3.1.8, 3.2.4, 3.3.3, 3.4.0, and 3.5.0. Organizations should ensure that they are running updated versions to mitigate this risk.
Mitigation & Remediation
Organizations should prioritize patching this vulnerability by upgrading to the latest OpenSSL version. To ensure security, they can also implement network controls to limit exposure to potential attacks and monitor application behavior.
Detection Guidance
Monitoring application logs for indicators of crashes and anomalous behavior can help in identifying possible exploitation attempts of this vulnerability.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2025-9232 lies in its demonstration of how even low-severity vulnerabilities can lead to service disruptions. Security teams should emphasize the importance of monitoring potential vulnerabilities within their software stacks. For additional insights into vulnerability management, organizations can explore resources on vulnerability management programs and consider the benefits of penetration testing to identify similar weaknesses.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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