CVE-2025-40718 is a medium-severity vulnerability affecting versions prior to 4.7.0 of the Quiter Gateway product, which is a Java WAR application deployed on Apache Tomcat servers. The vulnerability is classified under CWE-209, which involves the generation of error messages containing sensitive information. Specifically, this flaw arises from improper error handling within the Quiter Gateway software. An attacker can exploit this vulnerability by sending malformed payloads to the application, causing it to generate error messages that inadvertently disclose sensitive internal information. Such information could include stack traces, configuration details, or other internal state data that should not be exposed to unauthenticated users. The CVSS 4.0 vector indicates that the attack can be performed remotely (AV:N), requires no privileges (PR:N), no user interaction (UI:N), and does not require authentication or authorization (AT:N, SA:N). The vulnerability impacts confidentiality (VC:L) but not integrity or availability. There are no known exploits in the wild at the time of publication, and no patches have been linked yet. The vulnerability was reserved in April 2025 and published in July 2025. Given the nature of the flaw, it primarily facilitates information disclosure, which could be leveraged by attackers to gain further footholds or craft more targeted attacks against affected systems.

For European organizations using Quiter Gateway versions prior to 4.7.0, this vulnerability poses a risk of sensitive information leakage. Disclosure of internal error details can aid attackers in reconnaissance, enabling them to identify system configurations, software versions, or other exploitable weaknesses. This can lead to more sophisticated attacks such as privilege escalation, code injection, or lateral movement within networks. Organizations in sectors with high regulatory requirements for data protection, such as finance, healthcare, and critical infrastructure, may face compliance risks if sensitive data is exposed. Additionally, the exposure of internal system details could undermine trust in the affected services and lead to reputational damage. Since the vulnerability does not require authentication or user interaction, it can be exploited by remote attackers without prior access, increasing the threat surface. However, the absence of known exploits in the wild and the medium CVSS score suggest that while impactful, the threat is not currently widespread or critical but should be addressed promptly to prevent escalation.

To mitigate this vulnerability, European organizations should prioritize upgrading Quiter Gateway to version 4.7.0 or later once available, as this version presumably contains the necessary fixes. In the absence of an immediate patch, organizations should implement web application firewall (WAF) rules to detect and block malformed payloads targeting the error handling routines of Quiter Gateway. Additionally, configuring Apache Tomcat and the Java application to suppress detailed error messages and stack traces from being sent to clients can reduce information leakage. Logging detailed errors internally while presenting generic error messages externally is recommended. Security teams should conduct thorough code reviews and penetration tests focusing on error handling paths to identify and remediate similar issues. Network segmentation and strict access controls around the Quiter Gateway servers can limit exposure. Monitoring logs for unusual requests that trigger error messages can help detect exploitation attempts early. Finally, organizations should ensure that incident response plans include procedures for handling information disclosure vulnerabilities.