CVE-2026-40618 | BIG-IP SSL/TLS vulnerability

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.

Published: 2026-05-13 Last update: 2026-06-29 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-40618 is rated Moderate Risk (43.4/100): CVSS High severity, with low exploitation likelihood (EPSS 0.32%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-40618

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.07% 0.32% +0.25%
2 2026-05-14 — 0.07% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-40618

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.7 4.0 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/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 Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network.
Attack complexity (AC:L)
Exploitation conditions are straightforward and stable.
Attack requirements (AT:N)
No additional preconditions are required beyond normal reachability.
Privileges required (PR:N)
No privileges are required.
User interaction (UI:N)
No user interaction is required.
Vulnerable system confidentiality impact (VC:N)
No confidentiality impact on the vulnerable system.
Vulnerable system integrity impact (VI:N)
No integrity impact on the vulnerable system.
Vulnerable system availability impact (VA:H)
High availability impact on the vulnerable system.
Subsequent system confidentiality impact (SC:N)
No confidentiality impact on subsequent systems.
Subsequent system integrity impact (SI:N)
No integrity impact on subsequent systems.
Subsequent system availability impact (SA:L)
Limited availability impact on subsequent systems.
Exploit maturity (threat) (E:X)
Not defined: no reliable threat intelligence; scoring assumes the worst case (equivalent to Attacked).
Confidentiality requirement (CR:X)
Not defined: insufficient information; scoring treats this like High (worst case).
Integrity requirement (IR:X)
Not defined: insufficient information; scoring treats this like High (worst case).
Availability requirement (AR:X)
Not defined: insufficient information; scoring treats this like High (worst case).
Modified attack vector (MAV:X)
Not defined: scoring uses the Base Attack Vector (AV).
Modified attack complexity (MAC:X)
Not defined: scoring uses the Base Attack Complexity (AC).
Modified attack requirements (MAT:X)
Not defined: scoring uses the Base Attack Requirements (AT).
Modified privileges required (MPR:X)
Not defined: scoring uses the Base Privileges Required (PR).
Modified user interaction (MUI:X)
Not defined: scoring uses the Base User Interaction (UI).
Modified vulnerable system confidentiality impact (MVC:X)
Not defined: scoring uses the Base VC metric.
Modified vulnerable system integrity impact (MVI:X)
Not defined: scoring uses the Base VI metric.
Modified vulnerable system availability impact (MVA:X)
Not defined: scoring uses the Base VA metric.
Modified subsequent system confidentiality impact (MSC:X)
Not defined: scoring uses the Base SC metric.
Modified subsequent system integrity impact (MSI:X)
Not defined: scoring uses the Base SI metric.
Modified subsequent system availability impact (MSA:X)
Not defined: scoring uses the Base SA metric.
Safety (supplemental) (S:X)
Not evaluated.
Automatable (supplemental) (AU:X)
Not evaluated.
Recovery (supplemental) (R:X)
Not evaluated.
Value density (supplemental) (V:X)
Not evaluated.
Vulnerability response effort (supplemental) (RE:X)
Not evaluated.
Provider urgency (supplemental) (U:X)
Not evaluated.
 — — [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2026-40618

GitHub Security Advisory for CVE-2026-40618

GHSA-jrwx-v3xx-xrp8 · Severity: high — When an SSL profile is configured on a virtual server on BIG-IP Virtual Edition (VE) without...

Affected software / configurations for CVE-2026-40618

Vendor Product Version Raw CPE
f5 big-ip_access_policy_manager >= 17.1.0, <= 17.1.3 cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:*
f5 big-ip_access_policy_manager >= 17.5.0, <= 17.5.1 cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:*
f5 big-ip_advanced_firewall_manager >= 17.1.0, <= 17.1.3 cpe:2.3:a:f5:big-ip_advanced_firewall_manager:*:*:*:*:*:*:*:*
f5 big-ip_advanced_firewall_manager >= 17.5.0, <= 17.5.1 cpe:2.3:a:f5:big-ip_advanced_firewall_manager:*:*:*:*:*:*:*:*
f5 big-ip_advanced_web_application_firewall >= 17.1.0, <= 17.1.3 cpe:2.3:a:f5:big-ip_advanced_web_application_firewall:*:*:*:*:*:*:*:*
f5 big-ip_advanced_web_application_firewall >= 17.5.0, <= 17.5.1 cpe:2.3:a:f5:big-ip_advanced_web_application_firewall:*:*:*:*:*:*:*:*
f5 big-ip_analytics >= 17.1.0, <= 17.1.3 cpe:2.3:a:f5:big-ip_analytics:*:*:*:*:*:*:*:*
f5 big-ip_analytics >= 17.5.0, <= 17.5.1 cpe:2.3:a:f5:big-ip_analytics:*:*:*:*:*:*:*:*
f5 big-ip_application_acceleration_manager >= 17.1.0, <= 17.1.3 cpe:2.3:a:f5:big-ip_application_acceleration_manager:*:*:*:*:*:*:*:*
f5 big-ip_application_acceleration_manager >= 17.5.0, <= 17.5.1 cpe:2.3:a:f5:big-ip_application_acceleration_manager:*:*:*:*:*:*:*:*
f5 big-ip_application_security_manager >= 17.1.0, <= 17.1.3 cpe:2.3:a:f5:big-ip_application_security_manager:*:*:*:*:*:*:*:*
f5 big-ip_application_security_manager >= 17.5.0, <= 17.5.1 cpe:2.3:a:f5:big-ip_application_security_manager:*:*:*:*:*:*:*:*
f5 big-ip_application_visibility_and_reporting >= 17.1.0, <= 17.1.3 cpe:2.3:a:f5:big-ip_application_visibility_and_reporting:*:*:*:*:*:*:*:*
f5 big-ip_application_visibility_and_reporting >= 17.5.0, <= 17.5.1 cpe:2.3:a:f5:big-ip_application_visibility_and_reporting:*:*:*:*:*:*:*:*
f5 big-ip_automation_toolchain >= 17.1.0, <= 17.1.3 cpe:2.3:a:f5:big-ip_automation_toolchain:*:*:*:*:*:*:*:*
f5 big-ip_automation_toolchain >= 17.5.0, <= 17.5.1 cpe:2.3:a:f5:big-ip_automation_toolchain:*:*:*:*:*:*:*:*
f5 big-ip_carrier-grade_nat >= 17.1.0, <= 17.1.3 cpe:2.3:a:f5:big-ip_carrier-grade_nat:*:*:*:*:*:*:*:*
f5 big-ip_carrier-grade_nat >= 17.5.0, <= 17.5.1 cpe:2.3:a:f5:big-ip_carrier-grade_nat:*:*:*:*:*:*:*:*
f5 big-ip_container_ingress_services >= 17.1.0, <= 17.1.3 cpe:2.3:a:f5:big-ip_container_ingress_services:*:*:*:*:*:*:*:*
f5 big-ip_container_ingress_services >= 17.5.0, <= 17.5.1 cpe:2.3:a:f5:big-ip_container_ingress_services:*:*:*:*:*:*:*:*
f5 big-ip_ddos_hybrid_defender >= 17.1.0, <= 17.1.3 cpe:2.3:a:f5:big-ip_ddos_hybrid_defender:*:*:*:*:*:*:*:*
f5 big-ip_ddos_hybrid_defender >= 17.5.0, <= 17.5.1 cpe:2.3:a:f5:big-ip_ddos_hybrid_defender:*:*:*:*:*:*:*:*
f5 big-ip_domain_name_system >= 17.1.0, <= 17.1.3 cpe:2.3:a:f5:big-ip_domain_name_system:*:*:*:*:*:*:*:*
f5 big-ip_domain_name_system >= 17.5.0, <= 17.5.1 cpe:2.3:a:f5:big-ip_domain_name_system:*:*:*:*:*:*:*:*
f5 big-ip_edge_gateway >= 17.1.0, <= 17.1.3 cpe:2.3:a:f5:big-ip_edge_gateway:*:*:*:*:*:*:*:*
f5 big-ip_edge_gateway >= 17.5.0, <= 17.5.1 cpe:2.3:a:f5:big-ip_edge_gateway:*:*:*:*:*:*:*:*
f5 big-ip_fraud_protection_service >= 17.1.0, <= 17.1.3 cpe:2.3:a:f5:big-ip_fraud_protection_service:*:*:*:*:*:*:*:*
f5 big-ip_fraud_protection_service >= 17.5.0, <= 17.5.1 cpe:2.3:a:f5:big-ip_fraud_protection_service:*:*:*:*:*:*:*:*
f5 big-ip_global_traffic_manager >= 17.1.0, <= 17.1.3 cpe:2.3:a:f5:big-ip_global_traffic_manager:*:*:*:*:*:*:*:*
f5 big-ip_global_traffic_manager >= 17.5.0, <= 17.5.1 cpe:2.3:a:f5:big-ip_global_traffic_manager:*:*:*:*:*:*:*:*
f5 big-ip_link_controller >= 17.1.0, <= 17.1.3 cpe:2.3:a:f5:big-ip_link_controller:*:*:*:*:*:*:*:*
f5 big-ip_link_controller >= 17.5.0, <= 17.5.1 cpe:2.3:a:f5:big-ip_link_controller:*:*:*:*:*:*:*:*
f5 big-ip_local_traffic_manager >= 17.1.0, <= 17.1.3 cpe:2.3:a:f5:big-ip_local_traffic_manager:*:*:*:*:*:*:*:*
f5 big-ip_local_traffic_manager >= 17.5.0, <= 17.5.1 cpe:2.3:a:f5:big-ip_local_traffic_manager:*:*:*:*:*:*:*:*
f5 big-ip_policy_enforcement_manager >= 17.1.0, <= 17.1.3 cpe:2.3:a:f5:big-ip_policy_enforcement_manager:*:*:*:*:*:*:*:*
f5 big-ip_policy_enforcement_manager >= 17.5.0, <= 17.5.1 cpe:2.3:a:f5:big-ip_policy_enforcement_manager:*:*:*:*:*:*:*:*
f5 big-ip_ssl_orchestrator >= 17.1.0, <= 17.1.3 cpe:2.3:a:f5:big-ip_ssl_orchestrator:*:*:*:*:*:*:*:*
f5 big-ip_ssl_orchestrator >= 17.5.0, <= 17.5.1 cpe:2.3:a:f5:big-ip_ssl_orchestrator:*:*:*:*:*:*:*:*
f5 big-ip_webaccelerator >= 17.1.0, <= 17.1.3 cpe:2.3:a:f5:big-ip_webaccelerator:*:*:*:*:*:*:*:*
f5 big-ip_webaccelerator >= 17.5.0, <= 17.5.1 cpe:2.3:a:f5:big-ip_webaccelerator:*:*:*:*:*:*:*:*
f5 big-ip_websafe >= 17.1.0, <= 17.1.3 cpe:2.3:a:f5:big-ip_websafe:*:*:*:*:*:*:*:*
f5 big-ip_websafe >= 17.5.0, <= 17.5.1 cpe:2.3:a:f5:big-ip_websafe:*:*:*:*:*:*:*:*
f5 big-ip_access_policy_manager >= 16.1.0, <= 16.1.6 cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:*
f5 big-ip_advanced_firewall_manager >= 16.1.0, <= 16.1.6 cpe:2.3:a:f5:big-ip_advanced_firewall_manager:*:*:*:*:*:*:*:*
f5 big-ip_advanced_web_application_firewall >= 16.1.0, <= 16.1.6 cpe:2.3:a:f5:big-ip_advanced_web_application_firewall:*:*:*:*:*:*:*:*
f5 big-ip_analytics >= 16.1.0, <= 16.1.6 cpe:2.3:a:f5:big-ip_analytics:*:*:*:*:*:*:*:*
f5 big-ip_application_acceleration_manager >= 16.1.0, <= 16.1.6 cpe:2.3:a:f5:big-ip_application_acceleration_manager:*:*:*:*:*:*:*:*
f5 big-ip_application_security_manager >= 16.1.0, <= 16.1.6 cpe:2.3:a:f5:big-ip_application_security_manager:*:*:*:*:*:*:*:*
f5 big-ip_application_visibility_and_reporting >= 16.1.0, <= 16.1.6 cpe:2.3:a:f5:big-ip_application_visibility_and_reporting:*:*:*:*:*:*:*:*
f5 big-ip_automation_toolchain >= 16.1.0, <= 16.1.6 cpe:2.3:a:f5:big-ip_automation_toolchain:*:*:*:*:*:*:*:*
f5 big-ip_carrier-grade_nat >= 16.1.0, <= 16.1.6 cpe:2.3:a:f5:big-ip_carrier-grade_nat:*:*:*:*:*:*:*:*
f5 big-ip_container_ingress_services >= 16.1.0, <= 16.1.6 cpe:2.3:a:f5:big-ip_container_ingress_services:*:*:*:*:*:*:*:*
f5 big-ip_ddos_hybrid_defender >= 16.1.0, <= 16.1.6 cpe:2.3:a:f5:big-ip_ddos_hybrid_defender:*:*:*:*:*:*:*:*
f5 big-ip_domain_name_system >= 16.1.0, <= 16.1.6 cpe:2.3:a:f5:big-ip_domain_name_system:*:*:*:*:*:*:*:*
f5 big-ip_edge_gateway >= 16.1.0, <= 16.1.6 cpe:2.3:a:f5:big-ip_edge_gateway:*:*:*:*:*:*:*:*
f5 big-ip_fraud_protection_service >= 16.1.0, <= 16.1.6 cpe:2.3:a:f5:big-ip_fraud_protection_service:*:*:*:*:*:*:*:*
f5 big-ip_global_traffic_manager >= 16.1.0, <= 16.1.6 cpe:2.3:a:f5:big-ip_global_traffic_manager:*:*:*:*:*:*:*:*
f5 big-ip_link_controller >= 16.1.0, <= 16.1.6 cpe:2.3:a:f5:big-ip_link_controller:*:*:*:*:*:*:*:*
f5 big-ip_local_traffic_manager >= 16.1.0, <= 16.1.6 cpe:2.3:a:f5:big-ip_local_traffic_manager:*:*:*:*:*:*:*:*
f5 big-ip_policy_enforcement_manager >= 16.1.0, <= 16.1.6 cpe:2.3:a:f5:big-ip_policy_enforcement_manager:*:*:*:*:*:*:*:*
f5 big-ip_ssl_orchestrator >= 16.1.0, <= 16.1.6 cpe:2.3:a:f5:big-ip_ssl_orchestrator:*:*:*:*:*:*:*:*
f5 big-ip_webaccelerator >= 16.1.0, <= 16.1.6 cpe:2.3:a:f5:big-ip_webaccelerator:*:*:*:*:*:*:*:*
f5 big-ip_websafe >= 16.1.0, <= 16.1.6 cpe:2.3:a:f5:big-ip_websafe:*:*:*:*:*:*:*:*
f5 big-ip_access_policy_manager 21.0.0 cpe:2.3:a:f5:big-ip_access_policy_manager:21.0.0:*:*:*:*:*:*:*
f5 big-ip_advanced_firewall_manager 21.0.0 cpe:2.3:a:f5:big-ip_advanced_firewall_manager:21.0.0:*:*:*:*:*:*:*
f5 big-ip_advanced_web_application_firewall 21.0.0 cpe:2.3:a:f5:big-ip_advanced_web_application_firewall:21.0.0:*:*:*:*:*:*:*
f5 big-ip_analytics 21.0.0 cpe:2.3:a:f5:big-ip_analytics:21.0.0:*:*:*:*:*:*:*
f5 big-ip_application_acceleration_manager 21.0.0 cpe:2.3:a:f5:big-ip_application_acceleration_manager:21.0.0:*:*:*:*:*:*:*
f5 big-ip_application_security_manager 21.0.0 cpe:2.3:a:f5:big-ip_application_security_manager:21.0.0:*:*:*:*:*:*:*
f5 big-ip_application_visibility_and_reporting 21.0.0 cpe:2.3:a:f5:big-ip_application_visibility_and_reporting:21.0.0:*:*:*:*:*:*:*
f5 big-ip_automation_toolchain 21.0.0 cpe:2.3:a:f5:big-ip_automation_toolchain:21.0.0:*:*:*:*:*:*:*
f5 big-ip_carrier-grade_nat 21.0.0 cpe:2.3:a:f5:big-ip_carrier-grade_nat:21.0.0:*:*:*:*:*:*:*
f5 big-ip_container_ingress_services 21.0.0 cpe:2.3:a:f5:big-ip_container_ingress_services:21.0.0:*:*:*:*:*:*:*
f5 big-ip_ddos_hybrid_defender 21.0.0 cpe:2.3:a:f5:big-ip_ddos_hybrid_defender:21.0.0:*:*:*:*:*:*:*
f5 big-ip_domain_name_system 21.0.0 cpe:2.3:a:f5:big-ip_domain_name_system:21.0.0:*:*:*:*:*:*:*
f5 big-ip_edge_gateway 21.0.0 cpe:2.3:a:f5:big-ip_edge_gateway:21.0.0:*:*:*:*:*:*:*
f5 big-ip_fraud_protection_service 21.0.0 cpe:2.3:a:f5:big-ip_fraud_protection_service:21.0.0:*:*:*:*:*:*:*
f5 big-ip_global_traffic_manager 21.0.0 cpe:2.3:a:f5:big-ip_global_traffic_manager:21.0.0:*:*:*:*:*:*:*
f5 big-ip_link_controller 21.0.0 cpe:2.3:a:f5:big-ip_link_controller:21.0.0:*:*:*:*:*:*:*
f5 big-ip_local_traffic_manager 21.0.0 cpe:2.3:a:f5:big-ip_local_traffic_manager:21.0.0:*:*:*:*:*:*:*

References for CVE-2026-40618

URL Tags
https://my.f5.com/manage/s/article/K000158082 Mitigation Vendor Advisory
cvelogic Threat Intelligence