BIG-IP SSL/TLS vulnerability

Answer in brief

CVE-2026-40618 records a High severity (CVSS 7.5) vulnerability in BIG-IP SSL/TLS vulnerability. The current sources do not mark it as known exploited. The current feed maps F5/BIG-IP (generic), F5/BIG-IP Next CNF (generic), F5/BIG-IP Next for Kubernetes (generic), F5/BIG-IP Next SPK (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published May 13, 2026Updated Jun 29, 2026Source checked Sep 19, 2026First seen by HOL Jun 29, 2026Material review Jun 29, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.5
Exploitation: Not marked as known exploited
Affected software: 4 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps F5/BIG-IP (generic), F5/BIG-IP Next CNF (generic), F5/BIG-IP Next for Kubernetes (generic), F5/BIG-IP Next SPK (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
F5/BIG-IPgeneric	>=21.0.0 <21.0.0.1 \|\| >=17.5.0 <17.1.5.4 \|\| >=17.1.0 <17.1.3.1 \|\| >=16.1.0 <*	21.0.0.1, 17.1.5.4, 17.1.3.1, *
F5/BIG-IP Next CNFgeneric	>=2.0.0 <* \|\| >=1.1.0 <*	*
F5/BIG-IP Next for Kubernetesgeneric	>=2.0.0 <2.2.0	2.2.0
F5/BIG-IP Next SPKgeneric	>=2.0.0 <* \|\| >=1.7.0 <*	*

Recommended response

Check inventory. Check lockfiles and deployed manifests for F5/BIG-IP, F5/BIG-IP Next CNF, F5/BIG-IP Next for Kubernetes.
Review the reported fix. Update F5/BIG-IP to 21.0.0.1; F5/BIG-IP Next CNF to *; F5/BIG-IP Next for Kubernetes to 2.2.0; F5/BIG-IP Next SPK to * if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
May 13, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Jun 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jun 29, 2026

Sources and claim methodology

Source referencemy.f5.com

Upstream source description

When an SSL profile is configured on a virtual server on BIG-IP Virtual Edition (VE) without Intel QuickAssist Technology (QAT) or on BIG-IP hardware platforms with the database variable crypto.hwacceleration set to disabled, undisclosed traffic can cause the Traffic Management Microkernel (TMM) to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Quoted source text, attributed separately from HOL analysis.