CVE-2025-29157 is a medium severity vulnerability affecting the petstore application version 1.0.7. The vulnerability arises when a remote attacker accesses a non-existent endpoint (/cart), causing the server to return a 404 error page that inadvertently exposes sensitive information. Specifically, the error page reveals the Servlet name (default) and the server version. This information disclosure can aid attackers in crafting targeted attacks. Furthermore, the vulnerability allows remote code execution (RCE) due to improper handling of the request to the non-existent endpoint. The underlying weakness is related to CWE-77, which involves improper neutralization of special elements used in a command ('Command Injection'). The CVSS score of 6.5 (medium severity) reflects that the vulnerability can be exploited remotely without authentication or user interaction, with low attack complexity, and impacts confidentiality and integrity but not availability. The exposure of server details combined with the ability to execute arbitrary code remotely poses a significant risk, as attackers can leverage this to compromise the system, escalate privileges, or pivot within the network. No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability was published on 25 September 2025, with the initial reservation on 11 March 2025.

For European organizations using petstore v1.0.7, this vulnerability presents a tangible risk. The ability to execute arbitrary code remotely without authentication means attackers can potentially take full control of affected servers. This could lead to data breaches, unauthorized data manipulation, and disruption of business processes. The exposure of server version and servlet information lowers the attacker's effort to tailor exploits, increasing the likelihood of successful attacks. Organizations in sectors with high regulatory requirements (e.g., finance, healthcare, critical infrastructure) may face compliance violations if sensitive data is compromised. Additionally, the medium severity rating suggests that while the vulnerability is not the most critical, it still requires prompt attention to prevent exploitation. Given the remote and unauthenticated nature of the attack vector, the threat surface is broad, potentially affecting any exposed petstore instances accessible over the network. The lack of known exploits in the wild provides a window for mitigation before widespread attacks occur.

1. Immediate mitigation should include restricting access to the petstore application endpoints, especially from untrusted networks, using network-level controls such as firewalls or VPNs. 2. Implement custom error handling to avoid disclosing sensitive server information in error messages; configure the server to return generic error pages without revealing internal details. 3. Apply input validation and sanitization on all endpoints to prevent command injection vulnerabilities, ensuring that user input cannot be interpreted as commands. 4. Monitor logs for unusual access patterns to non-existent endpoints like /cart, which may indicate probing attempts. 5. If possible, isolate the petstore application in a segmented network zone to limit potential lateral movement in case of compromise. 6. Stay alert for official patches or updates from the petstore vendor and apply them promptly once available. 7. Conduct a thorough security review of the application codebase focusing on command execution functions and error handling mechanisms. 8. Employ runtime application self-protection (RASP) or web application firewalls (WAF) with rules to detect and block command injection attempts targeting the application.