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Vulnerabilities/CVE-2026-34019Public Intelligence Dossier
Source: f5 · Limited verification•Last verified: •Collection Degraded
CVE-2026-34019Unknown / EvaluatingMEDIUM (raw)CVSS 6.3CWE-410

When Bidirectional Forwarding Detection (BFD) is configured in Static and Dynamic routing protocols, undisclosed traffic can cause the Traffic Management Microkernel (TMM) to stop processing BFD packets and cause the configured routing protocol to fail over

Published: 13 May 2026•Last updated: 26 Oct 2026, 07:40 PM IST•Source identifier: f5sirt@f5.com
Dossier completeness: source-provided sections 2 / 3 · rule guidance available. Missing source facts count as incomplete.
Official source
CISA KEV catalog
Unknown
KEV status was not determined.
CVSS score
6.3MEDIUM (raw)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/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
Metric sourcef5sirt@f5.com
EPSS probability
0.3%0.003
Percentile22nd
Weakness type
CWE-410
No further CWE recorded
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

When Bidirectional Forwarding Detection (BFD) is configured in Static and Dynamic routing protocols, undisclosed traffic can cause the Traffic Management Microkernel (TMM) to stop processing BFD packets and cause the configured routing protocol to fail over. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

SOC priority

Medium

Actively exploited (source statement)

Unknown

Publicly disclosed

Unknown

Risk basis: Microsoft or Microsoft-managed product relevance; Source severity; no confirmed exploitation signal

Affected Products & Remediation

21 source-backed products
Affected products and versions (source)
  • f5 big-ip access policy manager · >= 17.1.0 <= 17.1.2; 17.5.0 · NVD CPE · Source
  • f5 big-ip advanced firewall manager · >= 17.1.0 <= 17.1.2; 17.5.0 · NVD CPE · Source
  • f5 big-ip advanced web application firewall · >= 17.1.0 <= 17.1.2; 17.5.0 · NVD CPE · Source
  • f5 big-ip analytics · >= 17.1.0 <= 17.1.2; 17.5.0 · NVD CPE · Source
  • f5 big-ip application acceleration manager · >= 17.1.0 <= 17.1.2; 17.5.0 · NVD CPE · Source
  • f5 big-ip application security manager · >= 17.1.0 <= 17.1.2; 17.5.0 · NVD CPE · Source
  • f5 big-ip application visibility and reporting · >= 17.1.0 <= 17.1.2; 17.5.0 · NVD CPE · Source
  • f5 big-ip automation toolchain · >= 17.1.0 <= 17.1.2; 17.5.0 · NVD CPE · Source
  • f5 big-ip carrier-grade nat · >= 17.1.0 <= 17.1.2; 17.5.0 · NVD CPE · Source
  • f5 big-ip container ingress services · >= 17.1.0 <= 17.1.2; 17.5.0 · NVD CPE · Source
  • f5 big-ip ddos hybrid defender · >= 17.1.0 <= 17.1.2; 17.5.0 · NVD CPE · Source
  • f5 big-ip domain name system · >= 17.1.0 <= 17.1.2; 17.5.0 · NVD CPE · Source
  • f5 big-ip edge gateway · >= 17.1.0 <= 17.1.2; 17.5.0 · NVD CPE · Source
  • f5 big-ip fraud protection service · >= 17.1.0 <= 17.1.2; 17.5.0 · NVD CPE · Source
  • f5 big-ip global traffic manager · >= 17.1.0 <= 17.1.2; 17.5.0 · NVD CPE · Source
  • f5 big-ip link controller · >= 17.1.0 <= 17.1.2; 17.5.0 · NVD CPE · Source
  • f5 big-ip local traffic manager · >= 17.1.0 <= 17.1.2; 17.5.0 · NVD CPE · Source
  • f5 big-ip policy enforcement manager · >= 17.1.0 <= 17.1.2; 17.5.0 · NVD CPE · Source
  • f5 big-ip ssl orchestrator · >= 17.1.0 <= 17.1.2; 17.5.0 · NVD CPE · Source
  • f5 big-ip webaccelerator · >= 17.1.0 <= 17.1.2; 17.5.0 · NVD CPE · Source
  • f5 big-ip websafe · version range not provided by source · NVD CPE · Source
Recorded patch / KBNot provided by source

Vendor or catalog guidance (source)

Not provided by source

Known exploitation (source facts)

Only what a source states. Unknown means no source has said either way; it is not "not exploited".

CISA KEV
Unknown
Exploited (source statement)
Unknown
Publicly disclosed (source)
Unknown

Suggested hunting (rule-based inference)

SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.

Matched network-unauthenticated (CVSS AV:N, CVSS PR:N, CVSS UI:N)

Exposure

  1. Identify devices reporting this CVE and note which expose the affected service to untrusted networks.Telemetry: DeviceTvmSoftwareVulnerabilities · A network-reachable, no-privilege vector makes internet-facing instances the first exposure question. · Rule network-unauthenticated

Exploitation evidence

  1. Review inbound connections to the affected service from unexpected sources since the advisory date.Telemetry: DeviceNetworkEvents · Hunting hypothesis from the CVSS vector; it does not show that exploitation occurred. · Rule network-unauthenticated

Response

  1. Confirm the source-stated update is installed and the CVE is no longer reported.Telemetry: DeviceTvmSoftwareVulnerabilities · A follow-up inventory check verifies remediation. · Rule network-unauthenticated

CISA KEV Record

CISA KEV status was not determined for this record.

Change History & Source Data

— No recorded material change

CNA / source
f5sirt@f5.com
Record status · verification
UPDATED · NVD API
CPE
cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:*, cpe:2.3:a:f5:big-ip_access_policy_manager:17.5.0:*:*:*:*:*:*:*, cpe:2.3:a:f5:big-ip_advanced_firewall_manager:*:*:*:*:*:*:*:*, cpe:2.3:a:f5:big-ip_advanced_firewall_manager:17.5.0:*:*:*:*:*:*:*, cpe:2.3:a:f5:big-ip_advanced_web_application_firewall:*:*:*:*:*:*:*:*, cpe:2.3:a:f5:big-ip_advanced_web_application_firewall:17.5.0:*:*:*:*:*:*:*, cpe:2.3:a:f5:big-ip_analytics:*:*:*:*:*:*:*:*, cpe:2.3:a:f5:big-ip_analytics:17.5.0:*:*:*:*:*:*:*, cpe:2.3:a:f5:big-ip_application_acceleration_manager:*:*:*:*:*:*:*:*, cpe:2.3:a:f5:big-ip_application_acceleration_manager:17.5.0:*:*:*:*:*:*:*

Evidence & Provenance

2 public sources
my.f5.comSource recordnvd.nist.govSource record

Linked by the query's stored exact CVE association. Review required tables and validation status before use.

Detection Hunting Query
Target: DeviceTvmSoftwareVulnerabilities•Defender XDR
Detect endpoints exposed to CVE-2026-34019
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2026-34019
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2026-34019"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel desc
Schema Checked · Not runtime validatedSource: SecOps Signal deterministic template · Limited verificationStatic screening: Passed structure and schema checks; tenant execution is not verified.
Open KQL Library

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Correlated briefings

SecOps Signal surfaces public advisory facts only. A missing value means the source has not published it, not that your environment is unaffected. No tenant inventory is connected.