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Big Ip Local Traffic ManagerApplication · F5

CVE-2017-6155

HIGH · 7.5 CVSS v3.0 Published 2018-04-13
Fix available
A fix is available. Upgrade to after 12.1.3 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 F5 BIG-IP 13.0.0, 12.0.0-12.1.3.1, 11.6.0-11.6.2, 11.4.1-11.5.5, or 11.2.1, malformed SPDY or HTTP/2 requests may result in a disruption of service to TMM. Data plane is only exposed when a SPDY or HTTP/2 profile is attached to a virtual server. There is no control plane exposure.

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

Malformed SPDY or HTTP/2 requests can cause a denial of service condition on the TMM (Traffic Management Microkernel) in F5 BIG-IP devices. The vulnerability is exploitable through the data plane only when a SPDY or HTTP/2 profile is attached to a virtual server, with no control plane exposure.

MitigationRemove or disable SPDY and HTTP/2 profiles from affected virtual servers to block the attack vector, and upgrade to a patched F5 BIG-IP version once available.

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:>= 11.5.1, <= 11.5.5>= 11.6.1, <= 11.6.2>= 12.1.0, <= 12.1.3= 11.2.1= 13.0.0
Big Ip Application Acceleration ManagerApplication
Affected:>= 11.5.1, <= 11.5.5>= 11.6.1, <= 11.6.2>= 12.1.0, <= 12.1.3= 11.2.1= 13.0.0
Big Ip Advanced Firewall ManagerApplication
Affected:>= 11.5.1, <= 11.5.5>= 11.6.1, <= 11.6.2>= 12.1.0, <= 12.1.3= 11.2.1= 13.0.0
Big Ip Access Policy ManagerApplication
Affected:>= 11.5.1, <= 11.5.5>= 11.6.1, <= 11.6.2>= 12.1.0, <= 12.1.3= 11.2.1= 13.0.0
Big Ip Application Security ManagerApplication
Affected:>= 11.5.1, <= 11.5.5>= 11.6.1, <= 11.6.2>= 12.1.0, <= 12.1.3= 11.2.1= 13.0.0
Big Ip Edge GatewayWeb browser
Affected:>= 11.5.1, <= 11.5.5>= 11.6.1, <= 11.6.2>= 12.1.0, <= 12.1.3= 11.2.1= 13.0.0
Big Ip Link ControllerApplication
Affected:>= 11.5.1, <= 11.5.5>= 11.6.1, <= 11.6.2>= 12.1.0, <= 12.1.3= 11.2.1= 13.0.0
Big Ip Policy Enforcement ManagerApplication
Affected:>= 11.5.1, <= 11.5.5>= 11.6.1, <= 11.6.2>= 12.1.0, <= 12.1.3= 11.2.1= 13.0.0

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. Check installed F5 BIG-IP version
    Run `tmsh show /sys version` or `show /sys version` in the TMOS shell to retrieve the installed software version
    Affected if The version falls within 11.2.1, 11.5.1-11.5.5, 11.6.1-11.6.2, 12.1.0-12.1.3, or 13.0.0
  2. Identify configured SPDY profiles
    Run `tmsh list /ltm profile spdy` to list all SPDY profiles configured on the system
    Affected if Any SPDY profiles exist in the configuration
  3. Identify configured HTTP/2 profiles
    Run `tmsh list /ltm profile http2` to list all HTTP/2 profiles configured on the system
    Affected if Any HTTP/2 profiles exist in the configuration
  4. Check virtual servers with SPDY profile attached
    Run `tmsh list /ltm virtual all-properties` and grep for 'spdy' in the profile section, or inspect each virtual server's profile assignment via the web UI under Local Traffic > Virtual Servers
    Affected if Any virtual server has a SPDY profile assigned to it
  5. Check virtual servers with HTTP/2 profile attached
    Run `tmsh list /ltm virtual all-properties` and grep for 'http2' in the profile section, or inspect each virtual server's profile assignment via the web UI under Local Traffic > Virtual Servers
    Affected if Any virtual server has an HTTP/2 profile assigned to it

You are affected if your BIG-IP version is one of the listed versions AND at least one virtual server has either a SPDY or HTTP/2 profile attached.

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 12.1.3
Interim mitigation

Remove or disable SPDY and HTTP/2 profiles from affected virtual servers to block the attack vector, and upgrade to a patched F5 BIG-IP version once available.

Fix this in Big Ip Local Traffic 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-2017-6155 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