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Big Ip Access Policy ManagerApplication · F5

CVE-2019-6623

HIGH · 7.5 CVSS v3.1 Published 2019-07-02
Fix available
A fix is available. Upgrade to after 14.1.0.5 or later.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
On BIG-IP 14.1.0-14.1.0.5, 14.0.0-14.0.0.4, 13.0.0-13.1.1.4, and 12.1.0-12.1.4, undisclosed traffic sent to BIG-IP iSession virtual server may cause the Traffic Management Microkernel (TMM) to restart, resulting in a Denial-of-Service (DoS).

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

A vulnerability in F5 BIG-IP versions 12.1.0 through 14.1.0.5 allows unauthenticated remote attackers to cause a Denial of Service by sending undisclosed traffic to iSession virtual servers, which triggers a Traffic Management Microkernel (TMM) restart.

MitigationApply the appropriate F5 hotfix or upgrade to a patched version outside the affected version ranges (14.1.0.6+, 14.0.0.5+, 13.1.1.5+, 12.1.4.1+).

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Big Ip Access Policy ManagerApplication
Affected:>= 12.1.0, <= 12.1.4>= 13.0.0, <= 13.1.1.4>= 14.0.0, <= 14.0.0.4>= 14.1.0, <= 14.1.0.5
Big Ip Advanced Firewall ManagerApplication
Affected:>= 12.1.0, <= 12.1.4>= 13.0.0, <= 13.1.1.4>= 14.0.0, <= 14.0.0.4>= 14.1.0, <= 14.1.0.5
Big Ip Application Acceleration ManagerApplication
Affected:>= 12.1.0, <= 12.1.4>= 13.0.0, <= 13.1.1.4>= 14.0.0, <= 14.0.0.4>= 14.1.0, <= 14.1.0.5
Big Ip Link ControllerApplication
Affected:>= 12.1.0, <= 12.1.4>= 13.0.0, <= 13.1.1.4>= 14.0.0, <= 14.0.0.4>= 14.1.0, <= 14.1.0.5
Big Ip Policy Enforcement ManagerApplication
Affected:>= 12.1.0, <= 12.1.4>= 13.0.0, <= 13.1.1.4>= 14.0.0, <= 14.0.0.4>= 14.1.0, <= 14.1.0.5
Big Ip WebacceleratorApplication
Affected:>= 12.1.0, <= 12.1.4>= 13.0.0, <= 13.1.1.4>= 14.0.0, <= 14.0.0.4>= 14.1.0, <= 14.1.0.5
Big Ip Application Security ManagerApplication
Affected:>= 12.1.0, <= 12.1.4>= 13.0.0, <= 13.1.1.4>= 14.0.0, <= 14.0.0.4>= 14.1.0, <= 14.1.0.5
Big Ip Local Traffic ManagerApplication
Affected:>= 12.1.0, <= 12.1.4>= 13.0.0, <= 13.1.1.4>= 14.0.0, <= 14.0.0.4>= 14.1.0, <= 14.1.0.5

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Check the BIG-IP version
    Run 'tmsh show sys version' or check the web UI under System > Software > Image List to determine the installed version
    Affected if The version falls within 12.1.0-12.1.4, 13.0.0-13.1.1.4, 14.0.0-14.0.0.4, or 14.1.0-14.1.0.5
  2. Identify iSession virtual servers
    Run 'tmsh list ltm persistence oneios' or check the Configuration utility under Local Traffic > Virtual Servers for virtual servers with iSession profile enabled
    Affected if Any virtual server is configured to use iSession (OneConnect) persistence profiles
  3. Verify TMM behavior
    Monitor TMM processes via 'tmsh show sys tmm-info' and review logs in /var/log/ltm for any unexpected restarts
    Affected if TMM restarts occur after receiving undisclosed traffic to iSession virtual servers

You are affected if your BIG-IP runs a version within the affected ranges AND has iSession virtual servers configured, as the vulnerability is triggered by sending traffic to those servers.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Upgrade available Upgrade to a release after 14.1.0.5
Interim mitigation

Apply the appropriate F5 hotfix or upgrade to a patched version outside the affected version ranges (14.1.0.6+, 14.0.0.5+, 13.1.1.5+, 12.1.4.1+).

Fix this in Big Ip Access Policy Manager Scoped from the published advisory
  • Consultation3.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,130
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,408.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2019-6623 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data