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Big Ip Access Policy ManagerApplication · F5

CVE-2019-6605

HIGH · 7.5 CVSS v3.0 Published 2019-03-28
Fix available
A fix is available. Upgrade to 11.5.9 / 11.6.4 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 11.5.1-11.5.8, 11.6.1-11.6.3, and 12.0.x, an undisclosed sequence of packets received by an SSL virtual server and processed by an associated Client SSL or Server SSL profile may cause a denial of service.

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 denial of service vulnerability in F5 BIG-IP SSL virtual servers. When an undisclosed sequence of packets is received by an SSL virtual server and processed by an associated Client SSL or Server SSL profile, it can cause the BIG-IP system to become unavailable, likely due to resource exhaustion or a crash in the SSL processing chain.

MitigationUpgrade BIG-IP to a patched version (13.x or later, or the specific patched version for the affected 11.5.x/12.0.x branches). If immediate patching is not possible, consider restricting access to affected SSL virtual servers or implementing rate limiting as a temporary measure.

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:>= 11.5.0, < 11.5.9>= 11.6.0, < 11.6.4>= 12.0.0, < 12.1.0
Big Ip Advanced Firewall ManagerApplication
Affected:>= 11.5.0, < 11.5.9>= 11.6.0, < 11.6.4>= 12.0.0, < 12.1.0
Big Ip Application Acceleration ManagerApplication
Affected:>= 11.5.0, < 11.5.9>= 11.6.0, < 11.6.4>= 12.0.0, < 12.1.0
Big Ip Edge GatewayWeb browser
Affected:>= 11.5.0, < 11.5.9>= 11.6.0, < 11.6.4>= 12.0.0, < 12.1.0
Big Ip Fraud Protection ServiceApplication
Affected:>= 11.5.0, < 11.5.9>= 11.6.0, < 11.6.4>= 12.0.0, < 12.1.0
Big Ip Global Traffic ManagerApplication
Affected:>= 11.5.0, < 11.5.9>= 11.6.0, < 11.6.4>= 12.0.0, < 12.1.0
Big Ip Link ControllerApplication
Affected:>= 11.5.0, < 11.5.9>= 11.6.0, < 11.6.4>= 12.0.0, < 12.1.0
Big Ip Local Traffic ManagerApplication
Affected:>= 11.5.0, < 11.5.9>= 11.6.0, < 11.6.4>= 12.0.0, < 12.1.0

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:3.0/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. Identify the F5 BIG-IP system version
    Run command: tmsh show sys version or check the BIG-IP GUI under System > Software Management > Software Images
    Affected if The installed version falls within 11.5.0 to 11.5.8, 11.6.0 to 11.6.3, or 12.0.0 to 12.0.x (any version below 12.1.0 in the 12.x branch)
  2. Verify SSL virtual servers exist
    Run command: tmsh list ltm virtual where type equals ssl or check via GUI under Local Traffic > Virtual Servers. Look for virtual servers with SSL type.
    Affected if Any SSL virtual servers are configured on the system
  3. Confirm Client SSL or Server SSL profiles are attached
    Run command: tmsh list ltm virtual <virtual_name> or check the virtual server configuration to see if a clientssl or serverssl profile is assigned
    Affected if The SSL virtual server has a Client SSL profile or Server SSL profile associated with it
  4. Check for exposed SSL virtual server traffic
    Review network exposure: tmsh list ltm virtual <virtual_name> | grep -E 'destination|ip' and verify accessibility from external networks
    Affected if The SSL virtual servers are accessible from untrusted networks (internet-facing)

The system is likely affected if it runs BIG-IP version 11.5.0-11.5.8, 11.6.0-11.6.3, or 12.0.0-12.0.x AND has SSL virtual servers with Client SSL or Server SSL profiles exposed to network traffic.

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 11.5.9 / 11.6.4 / 12.1.0 or later
Fixed in 11.5.911.6.412.1.0
Interim mitigation

Upgrade BIG-IP to a patched version (13.x or later, or the specific patched version for the affected 11.5.x/12.0.x branches). If immediate patching is not possible, consider restricting access to affected SSL virtual servers or implementing rate limiting as a temporary measure.

Fix this in Big Ip Access Policy Manager Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
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An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,120.

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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-2019-6605 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