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JunosOperating system · Juniper

CVE-2023-22401

HIGH · 7.5 CVSS v3.1 Published 2023-01-13
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
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
An Improper Validation of Array Index vulnerability in the Advanced Forwarding Toolkit Manager daemon (aftmand) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS). On the PTX10008 and PTX10016 platforms running Junos OS or Junos OS Evolved, when a specific SNMP MIB is queried this will cause a PFE crash and the FPC will go offline and not automatically recover. A system restart is required to get the affected FPC in an operational state again. This issue affects: Juniper Networks Junos OS 22.1 version 22.1R2 and later versions; 22.1 versions prior to 22.1R3; 22.2 versions prior to 22.2R2. Juniper Networks Junos OS Evolved 21.3-EVO version 21.3R3-EVO and later versions; 21.4-EVO version 21.4R1-S2-EVO, 21.4R2-EVO and later versions prior to 21.4R2-S1-EVO; 22.1-EVO version 22.1R2-EVO and later versions prior to 22.1R3-EVO; 22.2-EVO versions prior to 22.2R1-S1-EVO, 22.2R2-EVO.

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

Improper validation of array index in the Advanced Forwarding Toolkit Manager daemon (aftmand) allows unauthenticated network attackers to cause denial of service by querying a specific SNMP MIB on PTX10008 and PTX10016 platforms, resulting in PFE crash and FPC going offline with no auto-recovery.

MitigationApply vendor-supplied Junos OS/Evolved patches (22.1R3, 22.2R2, 21.4R2-S1-EVO, 22.1R3-EVO, 22.2R1-S1-EVO or later as appropriate) to fixed versions. Consider SNMP access controls as interim mitigation.

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
JunosOperating system
Affected:= 22.1= 22.2
Junos Os EvolvedOperating system
Affected:= 21.3= 21.4= 22.1= 22.2

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. Identify the hardware platform
    Run 'show chassis hardware' or check the model name via 'show system information'
    Affected if The platform is NOT PTX10008 or PTX10016 (vulnerability only affects these specific models)
  2. Check Junos OS version
    Run 'show version' or 'show version detail' to display the installed Junos version
    Affected if The version matches 22.1 or 22.2 (for Junos) OR 21.3, 21.4, 22.1, 22.2 (for Junos OS Evolved)
  3. Verify SNMP is configured
    Run 'show configuration snmp' to view SNMP configuration
    Affected if SNMP is enabled and accessible from untrusted networks (the flaw is triggered by querying a specific SNMP MIB)
  4. Confirm aftmand daemon status
    Run 'show system processes daemon' or check process list for aftmand
    Affected if The Advanced Forwarding Toolkit Manager daemon (aftmand) is running (required for the vulnerable code path to be reachable)

Device is affected if it is a PTX10008 or PTX10016 running a vulnerable Junos/Evolved version (22.1, 22.2 for Junos or 21.3, 21.4, 22.1, 22.2 for Junos Evolved) with SNMP access enabled from the network where the attacker resides.

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
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply vendor-supplied Junos OS/Evolved patches (22.1R3, 22.2R2, 21.4R2-S1-EVO, 22.1R3-EVO, 22.2R1-S1-EVO or later as appropriate) to fixed versions. Consider SNMP access controls as interim mitigation.

Recommended fix High confidence

Junos OS: 22.1R3 or 22.2R2; Junos OS Evolved: 21.4R2-S1-EVO, 22.1R3-EVO, or 22.2R1-S1-EVO/22.2R2-EVO

  1. 1. Identify the exact Junos OS or Junos OS Evolved version currently running on the affected PTX10008 or PTX10016 devices
  2. 2. For Junos OS: upgrade to version 22.1R3 or later, or 22.2R2 or later
  3. 3. For Junos OS Evolved 21.4-EVO: upgrade to 21.4R2-S1-EVO or later
  4. 4. For Junos OS Evolved 22.1-EVO: upgrade to 22.1R3-EVO or later
  5. 5. For Junos OS Evolved 22.2-EVO: upgrade to 22.2R1-S1-EVO or later, or 22.2R2-EVO or later
  6. 6. After upgrade, verify the Advanced Forwarding Toolkit Manager daemon (aftmand) is running properly
  7. 7. Test SNMP MIB queries on the affected platforms to confirm the vulnerability is remediated
  8. 8. If an FPC goes offline after the upgrade, restart the device as needed to restore full functionality
Caveat FPC may go offline after upgrade and require system restart to recover; test in lab environment before production deployment

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

Fix this in Junos Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA4.0 h
22.0 hours of engineering $3,860
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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-2023-22401 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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