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Big Ip Advanced Firewall ManagerApplication · F5

CVE-2022-41806

HIGH · 7.5 CVSS v3.1 Published 2022-10-19
Fix available
A fix is available. Upgrade to 15.1.5.1 / 16.1.3.2 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
In versions 16.1.x before 16.1.3.2 and 15.1.x before 15.1.5.1, when BIG-IP AFM Network Address Translation policy with IPv6/IPv4 translation rules is configured on a virtual server, undisclosed requests can cause an increase in memory resource utilization.

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 · moderate confidence

Memory exhaustion vulnerability in F5 BIG-IP AFM where undisclosed requests to virtual servers configured with IPv6/IPv4 Network Address Translation (NAT) policy rules cause excessive memory consumption, potentially leading to denial of service.

MitigationUpgrade BIG-IP to version 16.1.3.2 or 15.1.5.1 or later; alternatively, remove or disable IPv6/IPv4 translation rules in AFM NAT policies on affected virtual servers until patching is possible.

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 Advanced Firewall ManagerApplication
Affected:>= 15.1.0, < 15.1.5.1>= 16.1.0, < 16.1.3.2

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 BIG-IP version
    Run 'tmsh show sys version' or access the web UI to view the system version under System > Software Management > Image List
    Affected if Version is 15.1.0 through 15.1.5.0, or 16.1.0 through 16.1.3.1 (not 15.1.5.1 or later, nor 16.1.3.2 or later)
  2. Verify AFM module is provisioned
    Run 'tmsh show sys provision' or check in the web UI under System > Provisioning to confirm 'Advanced Firewall Manager' (AFM) is provisioned
    Affected if AFM module is provisioned (not set to 'None' or 'Nominal')
  3. Identify virtual servers with NAT policies
    Run 'tmsh list ltm virtual' and check for 'nat64' or 'nat46' references in the output, or inspect virtual server configuration under Local Traffic > Virtual Servers in the web UI
    Affected if Any virtual server references NAT64 or NAT46 policy configurations
  4. Check NAT policy translation rules
    Run 'tmsh list ltm nat' and 'tmsh list ltm policy' to examine NAT policies for IPv6/IPv4 translation rules, or review NAT policy settings in the web UI under Network > NAT Policies
    Affected if NAT policies contain active IPv6-to-IPv4 (NAT64) or IPv4-to-IPv6 (NAT46) translation rules applied to virtual servers
  5. Monitor memory consumption
    Run 'tmsh show sys memory' or monitor through the web UI under Dashboard > System Logs > Memory Usage to observe memory trends
    Affected if Abnormally high memory usage is observed, particularly on systems processing traffic through virtual servers with IPv6/IPv4 NAT policies

The environment is affected if BIG-IP version falls within 15.1.0-15.1.5.0 or 16.1.0-16.1.3.1, AFM module is provisioned, and virtual servers are configured with active IPv6/IPv4 NAT translation rules.

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.

dbcve · scoped
Upgrade available Upgrade to 15.1.5.1 / 16.1.3.2 or later
Fixed in 15.1.5.116.1.3.2
Interim mitigation

Upgrade BIG-IP to version 16.1.3.2 or 15.1.5.1 or later; alternatively, remove or disable IPv6/IPv4 translation rules in AFM NAT policies on affected virtual servers until patching is possible.

Recommended fix High confidence

Upgrade to 15.1.5.1 or later for 15.1.x versions; upgrade to 16.1.3.2 or later for 16.1.x versions

  1. Identify the current BIG-IP version using 'tmsh show sys version' or the web management console
  2. Determine if AFM (Advanced Firewall Manager) module is licensed and in use
  3. Determine if virtual servers are configured with AFM Network Address Translation (NAT) policies containing IPv6/IPv4 translation rules
  4. If vulnerable, plan for upgrade to a stable version during a maintenance window
  5. Back up the BIG-IP configuration using 'tmsh save sys config' or the web management console
  6. Follow F5 upgrade documentation for the specific version to upgrade the BIG-IP system
  7. After upgrade, verify the new version is >= 15.1.5.1 or >= 16.1.3.2
  8. Verify AFM NAT policies are functioning correctly after upgrade
Caveat Review F5 release notes for the target version for any compatibility notices, deprecated features, or known issues before upgrading

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Big Ip Advanced Firewall Manager Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing4.0 h
  • Review / QA2.0 h
15.0 hours of engineering $2,640
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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-2022-41806 in production — separate from our analysis above.

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What this is

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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