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JunosOperating system · Juniper

CVE-2022-22221

HIGH · 7.8 CVSS v3.1 Published 2022-07-20
Fix available
A fix is available. Upgrade to 19.2 or later.
See remediation →
80/100
Remediation priority · High
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 Neutralization of Special Elements vulnerability in the download manager of Juniper Networks Junos OS on SRX Series and EX Series allows a locally authenticated attacker with low privileges to take full control over the device. One aspect of this vulnerability is that the attacker needs to be able to execute any of the "request ..." or "show system download ..." commands. This issue affects Juniper Networks Junos OS on SRX Series and EX Series: All versions prior to 19.2R1-S9, 19.2R3-S5; 19.3 versions prior to 19.3R3-S6; 19.4 versions prior to 19.4R3-S8; 20.1 versions prior to 20.1R3-S4; 20.2 versions prior to 20.2R3-S4; 20.3 versions prior to 20.3R3-S3; 20.4 versions prior to 20.4R3-S2, 20.4R3-S3; 21.1 versions prior to 21.1R3-S1; 21.2 versions prior to 21.2R2-S2, 21.2R3; 21.3 versions prior to 21.3R2, 21.3R3; 21.4 versions prior to 21.4R1-S1, 21.4R2.

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

This is a command injection vulnerability in the Junos OS download manager on SRX and EX Series devices. A low-privilege authenticated attacker can execute arbitrary commands and gain full device control by leveraging the 'request ...' or 'show system download ...' commands due to improper neutralization of special elements in user input.

MitigationUpgrade Junos OS to one of the fixed versions listed (19.2R1-S9, 19.2R3-S5, 19.3R3-S6, 19.4R3-S8, 20.1R3-S4, 20.2R3-S4, 20.3R3-S3, 20.4R3-S2, 21.1R3-S1, 21.2R2-S2, 21.2R3, 21.3R2, 21.3R3, 21.4R1-S1, 21.4R2 or later).

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:< 19.2= 19.2= 19.3= 19.4= 20.1= 20.2= 20.3= 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
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/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 the installed Junos OS version
    Execute 'show version' or 'show system information' on the device CLI
    Affected if The version output matches any of these: 19.2, 19.3, 19.4, 20.1, 20.2, 20.3, 20.4, 21.1, 21.2, 21.3, 21.4, or any version below 19.2
  2. Confirm the device is an SRX or EX Series model
    Execute 'show chassis hardware' or 'show system information' to identify the hardware model
    Affected if The device model is an SRX Series firewall or EX Series switch
  3. Verify the download manager functionality is accessible
    Attempt to access 'request system download' or 'show system download' commands with low-privilege authenticated access
    Affected if The download manager commands are available to the authenticated user context being assessed
  4. Check for evidence of command injection in download logs
    Review system logs for 'download' related entries using 'show log messages | match download'
    Affected if Unexpected or malformed download commands appear in the logs

A user is affected if the device runs a Junos OS version in the 19.2 through 21.4 range on SRX or EX Series hardware and the download manager feature is accessible to the attacker.

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 19.2 or later
Fixed in 19.2
Interim mitigation

Upgrade Junos OS to one of the fixed versions listed (19.2R1-S9, 19.2R3-S5, 19.3R3-S6, 19.4R3-S8, 20.1R3-S4, 20.2R3-S4, 20.3R3-S3, 20.4R3-S2, 21.1R3-S1, 21.2R2-S2, 21.2R3, 21.3R2, 21.3R3, 21.4R1-S1, 21.4R2 or later).

Recommended fix High confidence

19.4R3-S8 (or later stable release within the 19.4 branch, or 20.1R3-S4/20.2R3-S4/20.3R3-S3/20.4R3-S3/21.1R3-S1/21.2R3/21.3R3/21.4R2 depending on compatibility)

  1. 1. Identify the current Junos OS version on the SRX Series or EX Series device using 'show version'
  2. 2. Review the Juniper KB article at kb.juniper.net for complete patch information
  3. 3. Plan maintenance window for upgrade (requires device reboot)
  4. 4. Backup current configuration using 'request system snapshot' or configuration export
  5. 5. Download the appropriate fixed Junos OS version (19.2R1-S9, 19.2R3-S5, 19.3R3-S6, or 19.4R3-S8 or later) from Juniper Networks
  6. 6. Transfer the Junos OS upgrade package to the device
  7. 7. Install the upgrade using 'request system software add <package-name>'
  8. 8. Reboot the device using 'request system reboot'
Caveat Standard Junos OS upgrade may cause temporary service disruption; ensure compatibility with other network devices and review Juniper upgrade documentation for specific model considerations

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

Fix this in Junos Scoped from the published advisory
  • Consultation6.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA2.0 h
22.0 hours of engineering $3,900
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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-2022-22221 in production — separate from our analysis above.

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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