CVE-2026-41957: RCE in F5 BIG-IP Configuration Utility

Successful exploitation of CVE-2026-41957 could allow an attacker to gain complete control over the affected BIG-IP or BIG-IQ system. This includes the ability to modify system configurations, steal sensitive data (such as user credentials, SSL certificates, and network configurations), and potentially pivot to other systems within the network. Given the critical role BIG-IP often plays in network infrastructure, a compromise could have a significant impact on the availability and integrity of services. The undisclosed nature of the vectors makes it difficult to predict the exact attack surface, but the RCE nature of the vulnerability suggests a high potential for severe consequences.

1. Gereserveerd2026-04-30
2. Gepubliceerd2026-05-13

The primary mitigation for CVE-2026-41957 is to upgrade to version 17.5.1.4 or later. If immediate upgrading is not possible, consider implementing network segmentation to limit the potential blast radius of a successful attack. While specific WAF rules are not readily available due to the undisclosed vectors, general RCE protection rules may offer some limited protection. Regularly review BIG-IP configurations for any unusual or unauthorized changes. After upgrading, verify the integrity of the system by checking for any unexpected processes or modified files.