Is CVE-2026-39459 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-39459 being exploited in the wild.

How severe is CVE-2026-39459?

High severity, with a CVSS score of 7.2, published 13 May 2026.

Which products and versions are affected?

F5 BIG-IP Advanced WAF 16.1.0-16.1.6, 17.5.0-17.5.1, 21.0.0; F5 Big-Ip Access Policy Manager 16.1.0-16.1.6, 17.5.0-17.5.1, 21.0.0; F5 Big-Ip Advanced Firewall Manager 16.1.0-16.1.6, 17.5.0-17.5.1, 21.0.0; F5 Big-Ip Local Traffic Manager 16.1.0-16.1.6, 17.5.0-17.5.1, 21.0.0.

Is there a fix for CVE-2026-39459?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-39459 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-39459?

Check whether you run F5 BIG-IP Advanced WAF, F5 Big-Ip Access Policy Manager, F5 Big-Ip Advanced Firewall Manager or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-39459: F5 BIG-IP arbitrary command execution in iControl REST and tmsh

CVE-2026-39459 · Severity: high · CVSS 7.2 · Published 2026-05-13

A vulnerability in F5 BIG-IP management interfaces allows a highly privileged user, such as a Manager, to bypass security restrictions and execute unauthorized commands on the system. BIG-IP devices are critical networking appliances used for traffic management, security, and access control in enterprise environments. An exploit could allow an internal attacker to gain full control over the device, potentially leading to data interception or significant network disruption.

Technologies: F5 BIG-IP Advanced WAF, F5 Big-Ip Access Policy Manager, F5 Big-Ip Advanced Firewall Manager, F5 Big-Ip Local Traffic Manager, F5 iControl REST. Vendors: F5.

Quick answers

Is CVE-2026-39459 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-39459 being exploited in the wild.
How severe is CVE-2026-39459?: High severity, with a CVSS score of 7.2, published 13 May 2026.
Which products and versions are affected?: F5 BIG-IP Advanced WAF 16.1.0-16.1.6, 17.5.0-17.5.1, 21.0.0; F5 Big-Ip Access Policy Manager 16.1.0-16.1.6, 17.5.0-17.5.1, 21.0.0; F5 Big-Ip Advanced Firewall Manager 16.1.0-16.1.6, 17.5.0-17.5.1, 21.0.0; F5 Big-Ip Local Traffic Manager 16.1.0-16.1.6, 17.5.0-17.5.1, 21.0.0.
Is there a fix for CVE-2026-39459?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-39459 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-39459?: Check whether you run F5 BIG-IP Advanced WAF, F5 Big-Ip Access Policy Manager, F5 Big-Ip Advanced Firewall Manager or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A least privilege violation (CWE-272) exists in the iControl REST API and the TMOS Shell (tmsh) of F5 BIG-IP. The flaw allows an authenticated user with high-level privileges (specifically the 'Manager' role or higher) to create configuration objects that trigger the execution of arbitrary system commands. While the attack requires high privileges, it allows an attacker to escalate their functional impact to full system compromise. The vulnerability affects multiple BIG-IP modules including LTM, APM, and Advanced WAF across versions 16.1.x, 17.5.x, and 21.0.0. F5 has released a vendor advisory (K000160863) detailing the issue.

Affected products

F5 BIG-IP Access Policy Manager 16.1.0-16.1.6, 17.5.0-17.5.1, 21.0.0
F5 BIG-IP Advanced Firewall Manager 16.1.0-16.1.6, 17.5.0-17.5.1, 21.0.0
F5 BIG-IP Advanced WAF 16.1.0-16.1.6, 17.5.0-17.5.1, 21.0.0
F5 BIG-IP Local Traffic Manager 16.1.0-16.1.6, 17.5.0-17.5.1, 21.0.0

Timeline

2026-05-13: advisory: Initial publication of the vulnerability details.

References

https://my.f5.com/manage/s/article/K000160863

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