Is CVE-2026-34019 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-34019 being exploited in the wild.

How severe is CVE-2026-34019?

Medium severity, with a CVSS score of 5.3, published 13 May 2026.

Which products and versions are affected?

F5 BIG-IP Not specified (EoTS versions excluded); F5 Big-Ip Access Policy Manager 16.1.0 - 16.1.6, 17.1.0 - 17.1.2, 17.5.0; F5 Big-Ip Advanced Firewall Manager 16.1.0 - 16.1.6, 17.1.0 - 17.1.2, 17.5.0; F5 Big-Ip Global Traffic Manager 16.1.0 - 16.1.6, 17.1.0 - 17.1.2, 17.5.0; and 1 more.

Is there a fix for CVE-2026-34019?

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-2026-34019 attacked?

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

Am I affected by CVE-2026-34019?

Check whether you run F5 BIG-IP, 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-2026-34019: F5 BIG-IP denial of service in BFD routing protocols

CVE-2026-34019 · Severity: medium · CVSS 5.3 · Published 2026-05-13

F5 BIG-IP devices, which manage and secure enterprise network traffic, are vulnerable to a denial-of-service issue when using certain routing protocols. An attacker can send specific network traffic that causes the device to stop processing health-check signals, leading to an unexpected network failover. This can result in temporary service disruptions or instability in how the network routes user traffic.

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

Quick answers

Is CVE-2026-34019 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-34019 being exploited in the wild.
How severe is CVE-2026-34019?: Medium severity, with a CVSS score of 5.3, published 13 May 2026.
Which products and versions are affected?: F5 BIG-IP Not specified (EoTS versions excluded); F5 Big-Ip Access Policy Manager 16.1.0 - 16.1.6, 17.1.0 - 17.1.2, 17.5.0; F5 Big-Ip Advanced Firewall Manager 16.1.0 - 16.1.6, 17.1.0 - 17.1.2, 17.5.0; F5 Big-Ip Global Traffic Manager 16.1.0 - 16.1.6, 17.1.0 - 17.1.2, 17.5.0; and 1 more.
Is there a fix for CVE-2026-34019?: 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-2026-34019 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-34019?: Check whether you run F5 BIG-IP, 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 vulnerability exists in the F5 BIG-IP Traffic Management Microkernel (TMM) related to the handling of Bidirectional Forwarding Detection (BFD) packets. When BFD is enabled for static or dynamic routing protocols, undisclosed network traffic can trigger a condition where TMM stops processing BFD packets. This leads to a timeout in the BFD session, causing the associated routing protocols to incorrectly assume a link failure and initiate a failover. The vulnerability is classified as CWE-410 (Insufficient Resource Pool) and can be exploited by a remote, unauthenticated attacker. Fixed versions include 17.5.1 and 17.1.2-ENG, while version 21.0.0 is reported as unaffected.

Affected products

F5 BIG-IP Access Policy Manager 16.1.0 - 16.1.6, 17.1.0 - 17.1.2, 17.5.0
F5 BIG-IP Advanced Firewall Manager 16.1.0 - 16.1.6, 17.1.0 - 17.1.2, 17.5.0
F5 BIG-IP Local Traffic Manager 16.1.0 - 16.1.6, 17.1.0 - 17.1.2, 17.5.0
F5 BIG-IP Global Traffic Manager 16.1.0 - 16.1.6, 17.1.0 - 17.1.2, 17.5.0

Timeline

2026-05-13: disclosed
2026-05-13: advisory

References

https://my.f5.com/manage/s/article/K000150508

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