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JunosOperating system · Juniper

CVE-2022-22241

CRITICAL · 9.8 CVSS v3.1 Published 2022-10-18
Fix available
A fix is available. Upgrade to 19.1 or later.
See remediation →
100/100
Remediation priority · Urgent
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 Input Validation vulnerability in the J-Web component of Juniper Networks Junos OS may allow an unauthenticated attacker to access data without proper authorization. Utilizing a crafted POST request, deserialization may occur which could lead to unauthorized local file access or the ability to execute arbitrary commands. This issue affects Juniper Networks Junos OS: all versions prior to 19.1R3-S9; 19.2 versions prior to 19.2R3-S6; 19.3 versions prior to 19.3R3-S7; 19.4 versions prior to 19.4R2-S7, 19.4R3-S9; 20.1 versions prior to 20.1R3-S5; 20.2 versions prior to 20.2R3-S5; 20.3 versions prior to 20.3R3-S5; 20.4 versions prior to 20.4R3-S4; 21.1 versions prior to 21.1R3-S2; 21.2 versions prior to 21.2R3-S1; 21.3 versions prior to 21.3R2-S2, 21.3R3; 21.4 versions prior to 21.4R1-S2, 21.4R2-S1, 21.4R3; 22.1 versions prior to 22.1R1-S1, 22.1R2.

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

J-Web component of Juniper Networks Junos OS contains an improper input validation vulnerability allowing unauthenticated attackers to send crafted POST requests that trigger unsafe deserialization. This can lead to unauthorized local file access or arbitrary command execution on the affected device.

MitigationApply the vendor-supplied Junos OS patches for all affected versions listed; alternatively, disable the J-Web interface if not required and restrict management access to trusted networks.

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:< 19.1= 19.1= 19.2= 19.3= 19.4= 20.1= 20.2= 20.3= 20.4= 21.1= 21.2= 21.3

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
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 Junos OS version
    Run 'show version' or 'show version detail' on the device CLI and note the exact version number
    Affected if The installed version matches any of these: 19.1, 19.2, 19.3, 19.4, 20.1, 20.2, 20.3, 20.4, 21.1, 21.2, 21.3, or is earlier than 19.1 (any version < 19.1)
  2. Confirm J-Web is enabled
    Check if the J-Web interface is active by reviewing system services configuration with 'show configuration system services web-management'
    Affected if J-Web (web-management) is enabled and configured on the device
  3. Verify J-Web http or https service binding
    Review the web-management configuration to confirm http or https services are bound to any interface, especially out-of-band management interfaces
    Affected if HTTP or HTTPS services are bound to any interface, making J-Web accessible
  4. Check management access exposure
    Review the firewall filter applied to the management interface with 'show configuration interfaces fxp0' and related firewall policies
    Affected if The management interface (fxp0) or loopback is accessible from untrusted networks without adequate ACLs

You are affected if your Junos OS version is 19.1 through 21.3 (or any version below 19.1) AND the J-Web interface is enabled and accessible, especially from untrusted networks.

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 19.1 or later
Fixed in 19.1
Interim mitigation

Apply the vendor-supplied Junos OS patches for all affected versions listed; alternatively, disable the J-Web interface if not required and restrict management access to trusted networks.

Recommended fix High confidence

Upgrade to 19.1R3-S9 (or later 19.1 release), 19.2R3-S6, or 19.3R3-S7 depending on your current branch

  1. 1. Identify the current Junos OS version using 'show version' command
  2. 2. Access the Juniper Networks support portal (kb.juniper.net) and locate the security advisories for CVE-2022-22241
  3. 3. Download the appropriate fixed Junos OS release for your hardware platform: for 19.1.x upgrade to 19.1R3-S9, for 19.2.x upgrade to 19.2R3-S6, for 19.3.x upgrade to 19.3R3-S7
  4. 4. Back up the current Junos configuration using 'request system configuration rescue save'
  5. 5. Upload the upgrade package to the device via SCP or USB
  6. 6. Perform the upgrade using 'request system software add <package-name>' command
  7. 7. Reboot the device after upgrade completes using 'request system reboot'
  8. 8. After reboot, verify the new version is installed using 'show version' and confirm the vulnerability is resolved
Caveat Standard Junos OS upgrade precautions apply - ensure configuration compatibility and have console access for recovery if needed

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 / QA2.0 h
20.0 hours of engineering $3,500
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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-2022-22241 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

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