CVE-2022-22207
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 · uneditedA Use After Free vulnerability in the Advanced Forwarding Toolkit (AFT) manager process (aftmand) of Juniper Networks Junos OS allows an unauthenticated networked attacker to cause a kernel crash due to intensive polling of Abstracted Fabric (AF) interface statistics and thereby a Denial of Service (DoS). Continued gathering of AF interface statistics will create a sustained Denial of Service (DoS) condition. This issue affects Juniper Networks Junos OS on MX Series: 20.1 versions later than 20.1R1; 20.2 versions prior to 20.2R3-S5; 20.3 versions prior to 20.3R3-S4; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R2; 21.2 versions prior to 21.2R2.
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 confidenceA Use After Free vulnerability in the Advanced Forwarding Toolkit (AFT) manager process (aftmand) in Juniper Networks Junos OS on MX Series allows an unauthenticated networked attacker to cause a kernel crash by intensively polling Abstracted Fabric (AF) interface statistics, resulting in Denial of Service. The attack can be repeated to create a sustained DoS condition.
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= 20.1= 20.2= 20.3= 20.4= 21.1= 21.2CVSS 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 checksWork through these to decide whether this CVE applies to you.
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Identify Junos OS versionRun 'show version' or 'request system version' to obtain the installed Junos OS version numberAffected if Version matches 20.1, 20.2, 20.3, 20.4, 21.1, or 21.2 from the affected list
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Confirm MX Series platformRun 'show chassis hardware' or 'show configuration chassis' to verify the device is an MX Series routerAffected if Hardware platform is an MX Series device
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Verify AFT (Advanced Forwarding Toolkit) is configuredRun 'show configuration forwarding-options' or 'show configuration interface | match "af-"' to check for Abstracted Fabric interface configurationAffected if Abstracted Fabric (AF) interfaces or AFT configuration exists in the running configuration
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Check if AF statistics polling is activeRun 'show interfaces af-* statistics' repeatedly or review any monitoring scripts that poll AF interface statisticsAffected if AF interface statistics are being actively polled or have been recently queried
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Monitor aftmand process stabilityRun 'show system processes' or 'show system processes extensive | match aftmand' to observe the aftmand process statusAffected if The aftmand process shows instability, high CPU usage, or has recently crashed
A system is affected if it runs Junos OS versions 20.1-21.2 on MX Series hardware with Abstracted Fabric (AF) interfaces actively configured and polled, enabling the vulnerable code path in the aftmand process.
Generated from the published advisory. Verify against your own configuration.
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 · scopedApply the vendor-provided patches for Junos OS (20.2R3-S5 and later, 20.3R3-S4 and later, 20.4R3 and later, 21.1R2 and later, 21.2R2 and later) after scheduling a maintenance window. Consider restricting network access to management interfaces and AF interface statistics polling mechanisms as an interim control.
20.2R3-S5 or later (20.3R3-S4, 20.4R3, 21.1R2, 21.2R2 are also fixed releases depending on starting version)
- 1. Identify the current Junos OS version running on the MX Series device using 'show version' command
- 2. Based on the current version, determine the minimum fixed release needed: For 20.1 versions later than 20.1R1, upgrade to 20.2R3-S5 or later; For 20.2 versions prior to 20.2R3-S5, upgrade to 20.2R3-S5 or later; For 20.3 versions prior to 20.3R3-S4, upgrade to 20.3R3-S4 or later; For 20.4 versions prior to 20.4R3, upgrade to 20.4R3 or later; For 21.1 versions prior to 21.1R2, upgrade to 21.1R2 o
- 3. Download the appropriate Junos OS upgrade package from the Juniper Networks download portal (https://www.juniper.net/customers/csc/management/software-download/)
- 4. Upload the upgrade package to the device using 'file copy' or equivalent method
- 5. Initiate the upgrade using 'request system software add <package-name>' command
- 6. After upgrade completes, reboot the device using 'request system reboot' command
- 7. Verify the new version is installed and the device is operational using 'show version' and 'show chassis routing-engine'
- 8. Confirm the vulnerability is resolved by verifying the AFT manager process (aftmand) is running without crashes
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation8.0 h
- Implementation4.0 h
- Testing6.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2022-22207 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2022-22207 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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