BIG-IP
CVE-2026-40629: BIG-IP SSL/TLS vulnerability
When SSL profiles are configured on a virtual server, undisclosed traffic can cause the virtual server to stop processing new client connections.
Published
ExploitedNot in CISA KEV
Ransomware useNot reportedPer CISA
SeverityHIGHCVSS 4.0 8.7
EPSS0.46%Chance of exploitation in 30 days
Public exploitNot tracked
FixAvailable
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| BIG-IP 21.0 | Not affected |
| BIG-IP 17.5 | 17.5.1.4 or later |
| BIG-IP 17.1 | 17.1.3.1 or later |
| BIG-IP 16.1 | * or later |
| BIG-IP Next SPK 2.0 | 2.0.3 or later |
| BIG-IP Next SPK 1.7 | 1.7.16 or later |
| BIG-IP Next CNF 2.0 | 2.0.3 or later |
| BIG-IP Next CNF 1.1 | 1.4.1 or later |
| BIG-IP Next for Kubernetes 2.0 | 2.1.1 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
When SSL profiles are configured on a virtual server, undisclosed traffic can cause the virtual server to stop processing new client connections. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 12 Oct 2026.