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JunosOperating system · Juniper

CVE-2022-22249

MEDIUM · 6.5 CVSS v3.1 Published 2022-10-18
Fix available
A fix is available. Upgrade to 15.1 or later.
See remediation →
70/100
Remediation priority · Elevated
Public exploit 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 the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on MX Series allows an unauthenticated adjacent attacker to cause a Denial of Service (DoS). When there is a continuous mac move a memory corruption causes one or more FPCs to crash and reboot. These MAC moves can be between two local interfaces or between core/EVPN and local interface. The below error logs can be seen in PFE syslog when this issue happens: xss_event_handler(1071): EA[0:0]_PPE 46.xss[0] ADDR Error. ppe_error_interrupt(4298): EA[0:0]_PPE 46 Errors sync xtxn error xss_event_handler(1071): EA[0:0]_PPE 1.xss[0] ADDR Error. ppe_error_interrupt(4298): EA[0:0]_PPE 1 Errors sync xtxn error xss_event_handler(1071): EA[0:0]_PPE 2.xss[0] ADDR Error. This issue affects Juniper Networks Junos OS on MX Series: All versions prior to 15.1R7-S13; 19.1 versions prior to 19.1R3-S9; 19.2 versions prior to 19.2R3-S6; 19.3 versions prior to 19.3R3-S6; 19.4 versions prior to 19.4R2-S7, 19.4R3-S8; 20.1 version 20.1R1 and later versions; 20.2 versions prior to 20.2R3-S5; 20.3 versions prior to 20.3R3-S5; 20.4 versions prior to 20.4R3-S2; 21.1 versions prior to 21.1R3; 21.2 versions prior to 21.2R3; 21.3 versions prior to 21.3R2.

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

A detailed technical summary for this CVE is being prepared.

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:< 15.1= 15.1= 19.1= 19.2= 19.3= 19.4= 20.1= 20.2= 20.3= 20.4= 21.1= 21.2

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
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

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 or later
Fixed in 15.1
Recommended fix High confidence

15.1R7-S13 (or later for 15.1 branch); 19.1R3-S9 (or later for 19.1 branch); 19.2R3-S6 (or later for 19.2 branch); 19.3R3-S6 (or later for 19.3 branch); 19.4R3-S8 (or later for 19.4 branch); 20.2R3-S5 (or later for 20.2 branch); 20.3R3-S5 (or later for 20.3 branch); 20.4R3-S2 (or later for 20.4 bran

  1. 1. Identify the current Junos OS version on the MX Series device using 'show version'
  2. 2. Determine the appropriate upgrade path based on the current version branch (15.1, 19.x, 20.x, or 21.x)
  3. 3. Download the fixed Junos OS release for your version branch from the Juniper Networks support portal
  4. 4. Upload the Junos OS upgrade package to the device using SCP or FTP
  5. 5. Verify the integrity of the uploaded package using 'request system software validate <package>'
  6. 6. Perform the upgrade using 'request system software add <package>'
  7. 7. Reboot the device after upgrade completes using 'request system reboot'
  8. 8. After reboot, verify the new Junos version is installed using 'show version'
Caveat Standard Junos upgrade risks apply - ensure valid configuration backup and plan for downtime as FPCs will reboot during upgrade. Test in lab environment first if possible.

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

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $1,600. Get the upgrade done

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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

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Peer-ranked notes from engineers who’ve handled CVE-2022-22249 in production — separate from our analysis above.

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