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JunosOperating system · Juniper

CVE-2022-22250

MEDIUM · 6.5 CVSS v3.1 Published 2022-10-18
Fix available
A fix is available. Upgrade to 20.4 or later.
See remediation →
70/100
Remediation priority · Elevated
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 Control of a Resource Through its Lifetime vulnerability in Packet Forwarding Engine (PFE) of Juniper Networks Junos OS and Junos OS Evolved allows unauthenticated adjacent attacker to cause a Denial of Service (DoS). In an EVPN-MPLS scenario, if MAC is learned locally on an access interface but later a request to delete is received indicating that the MAC was learnt remotely, this can lead to memory corruption which can result in line card crash and reload. This issue affects: Juniper Networks Junos OS All versions 17.3R1 and later versions prior to 19.2R3-S5; 19.3 versions prior to 19.3R3-S5; 19.4 versions prior to 19.4R2-S6, 19.4R3-S8; 20.1 version 20.1R1 and later versions; 20.2 versions prior to 20.2R3-S4; 20.3 versions prior to 20.3R3-S3; 20.4 versions prior to 20.4R3-S3; 21.1 versions prior to 21.1R3-S1; 21.2 versions prior to 21.2R3; 21.3 versions prior to 21.3R2; 21.4 versions prior to 21.4R1-S1, 21.4R2. Juniper Networks Junos OS Evolved All versions prior to 20.4R3-S3-EVO; 21.1-EVO version 21.1R1-EVO and later versions; 21.2-EVO versions prior to 21.2R3-EVO; 21.3-EVO versions prior to 21.3R2-EVO; 21.4-EVO versions prior to 21.4R1-S1-EVO, 21.4R2-EVO. This issue does not affect Juniper Networks Junos OS versions prior to 17.3R1.

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 memory corruption vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS and Junos OS Evolved allows unauthenticated adjacent attackers to cause denial of service. In EVPN-MPLS scenarios, when a MAC address is learned locally on an access interface but a subsequent delete request indicates the MAC was learned remotely, memory corruption occurs leading to line card crash and reload.

MitigationUpgrade Junos OS/Evolve to a patched version (19.4R3-S8, 20.4R3-S3, 21.1R3-S1, 21.2R3, 21.3R2, or 21.4R1-S1/21.4R2 and later). For EVPN-MPLS deployments, verify MAC learning behavior and consider network segmentation to limit adjacent attack surface until patching is complete.

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:= 17.3= 17.4= 17.4r2= 18.1= 18.1x75= 18.2= 18.2x75= 18.2x75-d10= 18.2x75-d30= 18.3= 18.4= 19.1
Junos Os EvolvedOperating system
Affected:< 20.4= 20.4= 21.1= 21.2= 21.3= 21.4

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
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:A/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 installed Junos OS version
    Run 'show version' or 'show version detail' to obtain the exact Junos OS version running on the device
    Affected if The installed version matches one of the affected versions: Junos 17.3, 17.4, 17.4r2, 18.1, 18.1x75, 18.2, 18.2x75, 18.2x75-d10, 18.2x75-d30, 18.3, 18.4, 19.1, or Junos OS Evolved versions 20.4, 21.1, 21.2, 21.3, 21.4 (or any version prior to 20.4 for Evolved)
  2. Confirm EVPN-MPLS configuration is in use
    Run 'show configuration protocols evpn' and look for 'encapsulation mpls' or 'instance-type evpn' combined with 'protocols mpls' in the configuration
    Affected if EVPN-MPLS encapsulation and instance are configured on the device, which is required for this vulnerability to be exploitable
  3. Verify local MAC learning is enabled on access interfaces
    Run 'show configuration interfaces <interface-name>' for access-facing interfaces within EVPN instances and look for 'family evpn' with local MAC learning behavior
    Affected if MAC addresses are being learned locally on access interfaces in an EVPN-MPLS setup, which creates the condition where the delete request mismatch can occur
  4. Review for recent line card crashes or reloads
    Run 'show log messages' and search for 'PFE' or 'line-card' crash indicators, or use 'show chassis firmware' to identify line card status
    Affected if Recent unexplained line card crashes or reloads have occurred, potentially indicating exploitation of this memory corruption issue

The environment is affected if the device runs a vulnerable Junos OS/Evolved version AND EVPN-MPLS with local MAC learning on access interfaces is configured, allowing the MAC learning/delete mismatch condition to occur.

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 20.4 or later
Fixed in 20.4
Interim mitigation

Upgrade Junos OS/Evolve to a patched version (19.4R3-S8, 20.4R3-S3, 21.1R3-S1, 21.2R3, 21.3R2, or 21.4R1-S1/21.4R2 and later). For EVPN-MPLS deployments, verify MAC learning behavior and consider network segmentation to limit adjacent attack surface until patching is complete.

Recommended fix High confidence

Junos OS: 21.4R2 or later; Junos OS Evolved: 21.4R2-EVO or later

  1. 1. Identify the current Junos OS or Junos OS Evolved version running on the device using 'show version' command
  2. 2. Based on the identified version, determine the appropriate fixed release from the Juniper advisory
  3. 3. For Junos OS: upgrade to 19.2R3-S5, 19.3R3-S5, 19.4R3-S8, 20.2R3-S4, 20.3R3-S3, 20.4R3-S3, 21.1R3-S1, 21.2R3, 21.3R2, or 21.4R2 (or later) depending on your current release train
  4. 4. For Junos OS Evolved: upgrade to 20.4R3-S3-EVO, 21.2R3-EVO, 21.3R2-EVO, or 21.4R2-EVO (or later)
  5. 5. Plan maintenance window as upgrade will require device reboot
  6. 6. Backup current configuration before upgrade
  7. 7. Download the appropriate Junos software package from Juniper Networks support portal
  8. 8. Install the upgrade using 'request system software add <package>' command
Caveat Standard Junos upgrade risks apply - ensure compatibility with other network devices and review release notes for any behavioral changes

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

Fix this in Junos Scoped from the published advisory
  • Consultation8.0 h
  • Implementation12.0 h
  • Testing8.0 h
  • Review / QA4.0 h
32.0 hours of engineering $5,680
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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-2022-22250 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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