CVE-2025-33203 is a Server-Side Request Forgery (SSRF) vulnerability classified under CWE-918, found in the chat API endpoint of the NVIDIA NeMo Agent ToolKit UI for Web. The vulnerability affects all versions prior to 1.3.0. SSRF vulnerabilities allow attackers to abuse a vulnerable server to send crafted requests to internal or external systems that the server can access but the attacker normally cannot. In this case, an attacker with low privileges (PR:L) can remotely trigger the server to make arbitrary HTTP requests without requiring user interaction (UI:N). The CVSS 3.1 base score of 7.6 reflects a high severity, with a high impact on confidentiality (C:H), and lower impacts on integrity (I:L) and availability (A:L). Exploiting this flaw could enable attackers to access sensitive internal resources, exfiltrate confidential information, or cause denial of service by overwhelming internal services or triggering application errors. The vulnerability is particularly concerning because the NeMo Agent ToolKit is used for AI conversational agents, which may have access to sensitive data or internal APIs. No public exploits have been reported yet, but the potential impact and ease of exploitation warrant immediate attention. The lack of a patch link suggests that users should monitor NVIDIA advisories for updates or apply workarounds where possible.

For European organizations, the impact of this SSRF vulnerability can be significant, especially for those using NVIDIA NeMo Agent ToolKit in AI development, customer service automation, or internal tooling. Confidentiality risks include unauthorized access to internal network resources, databases, or cloud metadata services, potentially exposing sensitive personal data protected under GDPR. Integrity risks, while lower, could involve manipulation of internal API responses or partial disruption of services. Availability could be affected if attackers leverage the vulnerability to cause denial of service, impacting business continuity. Given the increasing adoption of AI tools in sectors such as finance, healthcare, and manufacturing across Europe, exploitation could lead to regulatory penalties, reputational damage, and operational disruptions. The vulnerability's remote exploitability without user interaction increases the risk of automated attacks or inclusion in broader attack campaigns targeting AI infrastructure.

European organizations should immediately assess their use of NVIDIA NeMo Agent ToolKit and prioritize upgrading to version 1.3.0 or later once available. Until a patch is released, implement strict input validation and sanitization on all chat API endpoints to prevent malicious request payloads. Network segmentation should be enforced to limit the server's ability to reach sensitive internal resources or metadata services. Employ outbound request filtering and monitoring to detect and block anomalous or unauthorized server-initiated requests. Additionally, apply the principle of least privilege to the service accounts running the NeMo Agent ToolKit to minimize potential damage. Regularly review logs for unusual activity related to the chat API and consider deploying Web Application Firewalls (WAFs) with custom rules to detect SSRF patterns. Finally, maintain awareness of NVIDIA security advisories for timely patch deployment.