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Big Ip Local Traffic ManagerApplication · F5

CVE-2019-6645

HIGH · 7.5 CVSS v3.1 Published 2019-09-04
Fix available
A fix is available. Upgrade to after 13.1.1 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 14.0.0-14.1.0.5, 13.0.0-13.1.2, 12.1.0-12.1.4.1, 11.5.2-11.6.4, FTP traffic passing through a Virtual Server with both an active FTP profile associated and connection mirroring configured may lead to a TMM crash causing the configured HA action to be taken.

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

Denial of service vulnerability in F5 BIG-IP where FTP traffic passing through a virtual server with both an active FTP profile and connection mirroring enabled triggers a TMM (Traffic Management Module) crash, causing an unplanned HA failover.

MitigationDisable connection mirroring on affected virtual servers, remove the FTP profile if not required, or upgrade to patched versions (14.1.0.6+, 13.1.2.1+, 12.1.4.2+, 11.6.5+).

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 Local Traffic ManagerApplication
Affected:>= 11.5.2, <= 11.6.4>= 12.1.0, <= 12.1.4>= 13.0.0, <= 13.1.1= 14.0.0= 14.1.0
Big Ip Advanced Firewall ManagerApplication
Affected:>= 11.5.2, <= 11.6.4>= 12.1.0, <= 12.1.4>= 13.0.0, <= 13.1.1= 14.0.0= 14.1.0
Big Ip Application Acceleration ManagerApplication
Affected:>= 11.5.2, <= 11.6.4>= 12.1.0, <= 12.1.4>= 13.0.0, <= 13.1.1= 14.0.0= 14.1.0
Big Ip AnalyticsApplication
Affected:>= 11.5.2, <= 11.6.4>= 12.1.0, <= 12.1.4>= 13.0.0, <= 13.1.1= 14.0.0= 14.1.0
Big Ip Access Policy ManagerApplication
Affected:>= 11.5.2, <= 11.6.4>= 12.1.0, <= 12.1.4>= 13.0.0, <= 13.1.1= 14.0.0= 14.1.0
Big Ip Application Security ManagerApplication
Affected:>= 11.5.2, <= 11.6.4>= 12.1.0, <= 12.1.4>= 13.0.0, <= 13.1.1= 14.0.0= 14.1.0
Big Ip Edge GatewayWeb browser
Affected:>= 11.5.2, <= 11.6.4>= 12.1.0, <= 12.1.4>= 13.0.0, <= 13.1.1= 14.0.0= 14.1.0
Big Ip Fraud Protection ServiceApplication
Affected:>= 11.5.2, <= 11.6.4>= 12.1.0, <= 12.1.4>= 13.0.0, <= 13.1.1= 14.0.0= 14.1.0

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 view System > Software Management in the web UI to identify the installed version
    Affected if The version falls within 11.5.2-11.6.4, 12.1.0-12.1.4, 13.0.0-13.1.1, 14.0.0, or 14.1.0
  2. List virtual servers with FTP profile
    Run 'tmsh list /ltm virtual one-line' and look for 'ftp' in the profile list, or use 'tmsh list /ltm virtual <name> profile' for each virtual server
    Affected if Any virtual server has an FTP profile configured in its profile list
  3. Check for connection mirroring on virtual servers
    Run 'tmsh list /ltm virtual' and look for 'mirror enabled' or 'connection-mirror enabled' in the virtual server configuration
    Affected if Connection mirroring is enabled on a virtual server that also has an FTP profile
  4. Confirm FTP traffic is being processed
    Review virtual server statistics with 'tmsh show /ltm virtual <name> stats' or monitor logs for FTP connections
    Affected if FTP traffic is flowing through a virtual server with both FTP profile and connection mirroring enabled

The environment is affected if the BIG-IP version is in the affected range AND there exists a virtual server with both an active FTP profile AND connection mirroring enabled, as this combination triggers the TMM crash.

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 13.1.1
Interim mitigation

Disable connection mirroring on affected virtual servers, remove the FTP profile if not required, or upgrade to patched versions (14.1.0.6+, 13.1.2.1+, 12.1.4.2+, 11.6.5+).

Fix this in Big Ip Local Traffic Manager Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing4.0 h
  • Review / QA2.0 h
10.0 hours of engineering $1,720
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,752.

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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-2019-6645 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