CVE-2025-5253 is a vulnerability classified under CWE-770, which pertains to the allocation of resources without limits or throttling, found in Kron Technologies' Kron PAM product. This vulnerability allows an unauthenticated remote attacker with low privileges (PR:L) to launch an HTTP-based Denial of Service (DoS) attack against affected versions of Kron PAM prior to version 3.7. The flaw arises because the software does not impose adequate restrictions on resource allocation during HTTP request processing, enabling attackers to exhaust system resources such as memory or CPU. This results in service degradation or complete unavailability, impacting the availability aspect of the system's security. The vulnerability has a CVSS v3.1 base score of 6.5, indicating a medium severity level. The attack vector is network-based (AV:N), requires low attack complexity (AC:L), and does not require user interaction (UI:N). The scope remains unchanged (S:U), and there is no impact on confidentiality or integrity, only availability (A:H). No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability was reserved in May 2025 and published in July 2025, indicating it is a recent discovery. Kron PAM is a privileged access management solution, which typically manages and secures elevated credentials and access to critical systems, making its availability crucial for organizational security operations.

For European organizations, the impact of this vulnerability can be significant, especially for those relying on Kron PAM for managing privileged access to critical infrastructure, cloud environments, and sensitive data repositories. A successful HTTP DoS attack exploiting this flaw could disrupt access management services, potentially halting administrative operations and delaying incident response or security management activities. This disruption could lead to operational downtime, increased risk exposure, and compliance issues, particularly under regulations like GDPR that mandate availability and integrity of security controls. Although the vulnerability does not directly compromise confidentiality or integrity, the denial of service could indirectly facilitate other attacks by distracting security teams or delaying critical updates. Organizations with high dependency on Kron PAM for privileged access management may face increased operational risk and potential financial losses due to service outages.

Given the absence of an official patch at the time of this report, European organizations should implement specific mitigations to reduce exposure. These include: 1) Deploying network-level rate limiting and HTTP request throttling on perimeter devices and web application firewalls to restrict excessive or malformed HTTP requests targeting Kron PAM interfaces. 2) Isolating Kron PAM servers within segmented network zones with strict access controls to limit exposure to untrusted networks. 3) Monitoring Kron PAM server resource utilization closely to detect unusual spikes indicative of DoS attempts and enabling automated alerts. 4) Applying strict authentication and authorization policies to minimize the attack surface, even though the vulnerability requires low privileges, ensuring that only trusted users can access management interfaces. 5) Engaging with Kron Technologies for early access to patches or workarounds and planning prompt updates to version 3.7 or later once available. 6) Conducting regular penetration testing and resilience assessments focused on resource exhaustion scenarios to validate defenses. These targeted mitigations go beyond generic advice by focusing on resource management, network controls, and proactive monitoring tailored to the Kron PAM environment.