Which versions of F5 BIG-IP are affected by CVE-2026-40629?

F5 BIG-IP virtual servers with SSL profiles are vulnerable to remote denial-of-service attacks that can exhaust connection processing and force rejection of legitimate client connections.. A patch is available.

F5 BIG-IP CVE-2026-40629

Q: What is the CVSS score of CVE-2026-40629?

CVE-2026-40629 has a CVSS 4.0 base score of 8.7 (High). CVSS vector: 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. EPSS exploitation probability: 0.1%.

EUVD-2026-29977 HIGH

Allocation of Resources Without Limits or Throttling (CWE-770)

2026-05-13 f5

GHSA-x2rm-72v8-7794

Denial Of Service

8.7

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Lifecycle Timeline

Re-analysis Queued

May 13, 2026 - 16:22 vuln.today

cvss_changed

CVSS changed

May 13, 2026 - 16:22 NVD

7.5 (HIGH) 8.7 (HIGH)

Analysis Generated

May 13, 2026 - 15:46 vuln.today

CVE Published

May 13, 2026 - 14:12 nvd

HIGH 7.5

DescriptionNVD

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.

AnalysisAI

Denial of service in F5 BIG-IP virtual servers with SSL profiles allows remote unauthenticated attackers to exhaust connection processing via undisclosed traffic patterns, forcing affected servers to reject new client connections. The vulnerability affects multiple BIG-IP product lines including classic BIG-IP and all BIG-IP Next variants (SPK, CNF, Kubernetes). …

RemediationAI

Within 24 hours: Identify all F5 BIG-IP instances in your environment and document current versions. Within 7 days: Apply vendor patch K000158978 to all affected BIG-IP systems (classic BIG-IP and BIG-IP Next variants including SPK, CNF, and Kubernetes deployments); coordinate patching during maintenance windows to minimize service disruption. …

Analysis

Detailed AI-generated intelligence summary covering attack vector, impact assessment, affected versions, remediation steps, and indicators of compromise.

POChttps://••••••••••.com/exploit

PATCHhttps://••••••••••.com/patch

ADVISORYhttps://••••••••••.com/advisory

Full analysis requires sign-in

Get intelligence summaries, risk assessment, exploit details, threat intel, and remediation guidance.

CVE-2026-40629 vulnerability details – vuln.today

Back

F5 BIG-IP CVE-2026-40629

CVSS VectorNVD

Lifecycle Timeline

DescriptionNVD

AnalysisAI

RemediationAI

Analysis

Full analysis requires sign-in

Share

F5 BIG-IP CVE-2026-40629

CVSS VectorNVD

Lifecycle Timeline

DescriptionNVD

AnalysisAI

RemediationAI

Full analysis requires sign-in

Share

External POC / Exploit Code