# CVE-2026-40067: F5 BIG-IP APM buffer overflow in apmd process

Source: https://junglewise.ai/threats/cve-2026-40067-f5-big-ip-apm-buffer-overflow-in-apmd-process  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-13. Updated: 2026-06-29  
License: CC BY 4.0 with a link back

CVE-2026-40067 · Severity: high · CVSS 7.5 · Published 2026-05-13

F5 BIG-IP Access Policy Manager (APM) is a solution used to manage secure remote access to corporate applications. A vulnerability has been identified where specific network traffic can cause the system's policy management process to crash. This results in a denial-of-service, potentially preventing users from logging in or accessing protected resources.

Technologies: [F5 BIG-IP APM](https://junglewise.ai/threats/technologies/big-ip-apm), [F5 Big-Ip Access Policy Manager](https://junglewise.ai/threats/technologies/big-ip-access-policy-manager). Vendors: [F5](https://junglewise.ai/threats/vendors/f5).

## Quick answers

**Is CVE-2026-40067 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-40067 being exploited in the wild.

**How severe is CVE-2026-40067?** High severity, with a CVSS score of 7.5, published 13 May 2026.

**Which products and versions are affected?** F5 BIG-IP APM Undisclosed (EoTS versions excluded); F5 Big-Ip Access Policy Manager 17.5.0 to 17.5.1, 17.1.0 to 17.1.3, 16.1.0 to 16.1.6, 21.0.0.

**Is there a fix for CVE-2026-40067?** 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-2026-40067 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-40067?** Check whether you run F5 BIG-IP APM or F5 Big-Ip Access Policy Manager 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 classic buffer overflow (CWE-120) exists in the F5 BIG-IP APM 'apmd' process when an access policy is configured on a virtual server. The vulnerability is triggered by 'undisclosed traffic' and does not require authentication or user interaction. An attacker can exploit this to terminate the apmd process, leading to a denial-of-service (DoS) condition for access policy enforcement. F5 has released updates for several branches, including 21.0.0.1, 17.5.1.4, and 17.1.3.1, to address the issue.

## Affected products

- F5 BIG-IP Access Policy Manager 17.5.0 to 17.5.1, 17.1.0 to 17.1.3, 16.1.0 to 16.1.6, 21.0.0

## Timeline

- 2026-05-13: advisory: Initial advisory published by F5 Networks
- 2026-05-13: disclosed

## References

- [https://my.f5.com/manage/s/article/K000161056](https://my.f5.com/manage/s/article/K000161056)

## Related threats

- [F5 BIG-IP APM heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-94127-f5-big-ip-apm-heap-based-buffer-overflow)
- [F5 BIG-IP Appliance mode restriction bypass via path traversal](https://junglewise.ai/threats/cve-2026-42930-f5-big-ip-appliance-mode-restriction-bypass-via-path-traversal)
- [F5 BIG-IP privilege escalation in iControl SOAP via SNMP configuration](https://junglewise.ai/threats/cve-2026-42924-f5-big-ip-privilege-escalation-in-icontrol-soap-via-snmp)
- [F5 BIG-IP DoS in TMM via Client SSL Dynamic Record Sizing](https://junglewise.ai/threats/cve-2026-42920-f5-big-ip-dos-in-tmm-via-client-ssl-dynamic-record-sizing)
- [F5 BIG-IP privilege escalation in multiple modules](https://junglewise.ai/threats/cve-2026-42919-f5-big-ip-privilege-escalation-in-multiple-modules)