Summaryinfo

A vulnerability marked as problematic has been reported in F5 BIG-IP Next SPK and BIG-IP Next CNF. The affected element is the function HTTP::respond of the component iRule Handler. This manipulation causes resource consumption. This vulnerability is registered as CVE-2025-46706. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in F5 BIG-IP Next SPK and BIG-IP Next CNF (the affected version is unknown) and classified as problematic. Affected by this vulnerability is the function HTTP::respond of the component iRule Handler. The manipulation with an unknown input leads to a resource consumption vulnerability. The CWE definition for the vulnerability is CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. As an impact it is known to affect availability. The summary by CVE is:

When an iRule containing the HTTP::respond command is configured on a virtual server, undisclosed requests can cause an increase in memory resource utilization. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

It is possible to read the advisory at my.f5.com. This vulnerability is known as CVE-2025-46706. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 270608 (F5 Networks BIG-IP : BIG-IP iRules vulnerability (K000151611)), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (270608) and CERT Bund (WID-SEC-2025-2310). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

• F5 F5OS
• F5 BIG-IP

Productinfo

Type

• Firewall Software

Vendor

• F5

Name

• BIG-IP Next CNF
• BIG-IP Next SPK

License

• commercial

Website

• Vendor: https://f5.com/

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