The Cybersecurity and Infrastructure Security Agency (CISA) has officially added CVE-2025-3248, a critical vulnerability in Langflow, to its Known Exploited Vulnerabilities (KEV) Catalog, citing active exploitation in the wild. Langflow is an open-source AI workflow builder used for visualizing and managing AI-driven agents, making this vulnerability particularly concerning for organizations relying on AI automation.
1. Overview of CVE-2025-3248
Description
- Vulnerability Type: Missing Authentication for Critical Function (CWE-306)
- Affected Component:
/api/v1/validate/codeendpoint - Impact: Remote Code Execution (RCE)
- CVSS Score: 9.8 (Critical)
How It Works
- The vulnerability exists due to improper authentication in Langflow’s code validation endpoint.
- Attackers can send crafted HTTP requests to execute arbitrary Python code on vulnerable servers.
- The flaw arises from unsanitized use of Python’s
exec()function, allowing unauthenticated remote attackers to run commands on the system.
2. Affected Versions
- Langflow versions prior to 1.3.0 are vulnerable.
- The issue was patched in Langflow 1.3.0, released on March 31, 2025.
3. Exploitation Details
Active Exploitation
- Security researchers at Horizon3.ai discovered and reported the flaw in February 2025.
- A proof-of-concept (PoC) exploit was publicly released on April 9, 2025, increasing the risk of widespread attacks.
- Censys data shows 466 internet-exposed Langflow instances, primarily in the U.S., Germany, Singapore, India, and China.
Potential Attack Scenarios
- Remote attackers can inject malicious Python code, such as reverse shells, to gain full control over Langflow servers.
- Exploited servers may be used for data exfiltration, system disruption, or further malware deployment.
4. Mitigation Strategies
A. Apply Security Updates
- Organizations using Langflow should immediately upgrade to version 1.3.0 or later.
B. Restrict Network Access
- Limit exposure of Langflow’s API endpoints to trusted IP addresses.
- Implement firewall rules to block unauthorized access.
C. Monitor for Exploitation
- Deploy Intrusion Detection Systems (IDS) to flag suspicious API requests.
- Audit logs for unauthorized execution attempts.
5. Compliance Requirements
Federal Agencies
Under Binding Operational Directive (BOD) 22-01, Federal Civilian Executive Branch (FCEB) agencies must apply patches by May 26, 2025.
6. Conclusion
The inclusion of CVE-2025-3248 in CISA’s KEV Catalog highlights the critical nature of this vulnerability. Organizations using Langflow must prioritize patching, restrict access, and monitor for exploitation to mitigate risks.
