Advisoriesby IbisF5CVE-2026-59762
F5 BIG-IP: denial of service
Fix: upgrade to 21.1.0.1 or later (8 fixed versions below)
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 versions
| Package | Affected | Fixed in |
|---|---|---|
| BIG-IP Product | >= 21.1.0, < 21.1.0.1 | 21.1.0.1 |
| >= 21.0.0, < 21.0.0.3 | 21.0.0.3 | |
| >= 17.5.0, < 17.5.1.8 | 17.5.1.8 | |
| >= 17.1.0, < 17.1.3.4 | 17.1.3.4 | |
| BIG-IP Next CNF Product | >= 2.3.0, < 2.3.2 | 2.3.2 |
| >= 2.0.0, < 2.2.3 | 2.2.3 | |
| >= 1.1.0, < 1.4.3 | 1.4.3 | |
| BIG-IP Next SPK Product | <= 1.9.0 | No fix yet |
| >= 1.7.0, < 1.7.18 | 1.7.18 | |
| BIG-IP Next for Kubernetes Product | >= 2.3.0, < 2.3.2 | 2.3.2 |
| >= 2.0.0, < 2.2.3 | 2.2.3 |
Details and references
- CVSS 4.0
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-770