Description
When an HTTP/2 profile is configured on a virtual server, undisclosed requests can cause an increase in memory resource utilization.
Impact:
System performance can degrade until the TMM process is either forced to restart or is manually restarted. This vulnerability allows a remote, unauthenticated attacker to cause a degradation of service that can lead to a denial-of-service (DoS) on the BIG-IP system. There is no control plane exposure; this is a data plane issue only.
Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| F5 | BIG-IP | 21.1.0 – < 21.1.0.1, 21.0.0 – < 21.0.0.3, 17.5.0 – < 17.5.1.8, 17.1.0 – < 17.1.3.4 | 21.1.0.1 |
| F5 | BIG-IP Next for Kubernetes | 2.3.0 – < 2.3.2, 2.0.0 – < 2.2.3 | 2.3.2 |
| F5 | BIG-IP Next SPK | 1.9.0, 1.7.0 – < 1.7.18 | 1.7.18 |
| F5 | BIG-IP Next CNF | 2.3.0 – < 2.3.2, 2.0.0 – < 2.2.3, 1.1.0 – < 1.4.3 | 2.3.2 |
Advisories 1
- WID-SEC-2026-2371 F5 BIG-IP und BIG-IP Next: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Jul 15, 2026
References
- https://my.f5.com/manage/s/article/K000162231 vendor-advisory patch