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JunosOperating system · Juniper

CVE-2020-1654

CRITICAL · 9.8 CVSS v3.1 Published 2020-07-17
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
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
On Juniper Networks SRX Series with ICAP (Internet Content Adaptation Protocol) redirect service enabled, processing a malformed HTTP message can lead to a Denial of Service (DoS) or Remote Code Execution (RCE) Continued processing of this malformed HTTP message may result in an extended Denial of Service (DoS) condition. The offending HTTP message that causes this issue may originate both from the HTTP server or the HTTP client. This issue affects Juniper Networks Junos OS on SRX Series: 18.1 versions prior to 18.1R3-S9 ; 18.2 versions prior to 18.2R2-S7, 18.2R3-S3; 18.3 versions prior to 18.3R1-S7, 18.3R2-S4, 18.3R3-S1; 18.4 versions prior to 18.4R1-S7, 18.4R2-S4, 18.4R3; 19.1 versions prior to 19.1R1-S5, 19.1R2; 19.2 versions prior to 19.2R1-S2, 19.2R2; 19.3 versions prior to 19.3R2. This issue does not affect Juniper Networks Junos OS prior to 18.1R1.

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 vulnerability in Juniper Networks SRX Series devices with ICAP (Internet Content Adaptation Protocol) redirect service enabled allows remote attackers to cause Denial of Service or achieve Remote Code Execution by sending malformed HTTP messages. The malformed traffic can originate from either the HTTP server or client side.

MitigationUpgrade Junos OS to the specified fixed versions (18.1R3-S9, 18.2R2-S7, 18.2R3-S3, 18.3R2-S4, 18.3R3-S1, 18.4R3, 19.1R2, 19.2R2, 19.3R2 or later). If immediate patching is not possible, consider disabling ICAP redirect service if not required.

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:= 18.1= 18.2= 18.3= 18.4= 19.1= 19.2= 19.3

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 device model
    Run 'show chassis hardware' or 'show system information' to confirm the device is a Juniper SRX Series device.
    Affected if Device is not an SRX Series device (the vulnerability only affects SRX Series).
  2. Check Junos OS version
    Run 'show version' or 'show system version' to obtain the installed Junos OS version.
    Affected if The installed version matches one of the affected versions: 18.1, 18.2, 18.3, 18.4, 19.1, 19.2, or 19.3 (any specific release within these major.minor branches).
  3. Verify ICAP redirect service configuration
    Run 'show configuration | display set | match icap' or 'show services icap' to check if ICAP redirect service is configured and enabled.
    Affected if ICAP redirect service is actively configured on the device (the vulnerability requires ICAP redirect to be enabled).
  4. Inspect ICAP redirect policy bindings
    Run 'show services icap redirect policy' to see any defined ICAP redirect policies and their status.
    Affected if ICAP redirect policies exist and are applied (this confirms the attack surface is present).

A device is affected if it is an SRX Series running a vulnerable Junos 18.1-19.3 version AND has ICAP redirect service configured and active.

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

Upgrade Junos OS to the specified fixed versions (18.1R3-S9, 18.2R2-S7, 18.2R3-S3, 18.3R2-S4, 18.3R3-S1, 18.4R3, 19.1R2, 19.2R2, 19.3R2 or later). If immediate patching is not possible, consider disabling ICAP redirect service if not required.

Recommended fix High confidence

Upgrade to 18.1R3-S9, 18.2R3-S3, 18.3R3-S1, 18.4R3, or later (19.1R2, 19.2R2, 19.3R2 or later)

  1. 1. Identify the current Junos OS version on the SRX Series device using 'show version'
  2. 2. Check if ICAP redirect service is enabled using 'show services icap redirect status' or reviewing the configuration
  3. 3. If ICAP redirect service is not needed, disable it as a workaround: delete services icap redirect
  4. 4. If ICAP redirect service is required, plan for upgrade to a fixed version
  5. 5. Download the appropriate fixed Junos OS release from the Juniper Networks support portal
  6. 6. Upload the upgrade package to the device
  7. 7. Install the upgrade using 'request system software add <package>'
  8. 8. Reboot the device after upgrade using 'request system reboot'
Caveat Standard Junos upgrade considerations apply - review release notes for compatibility, ensure configuration backup before upgrade, and plan for downtime

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

Fix this in Junos Scoped from the published advisory
  • Consultation4.0 h
  • Implementation6.0 h
  • Testing4.0 h
  • Review / QA2.0 h
16.0 hours of engineering $2,840
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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-2020-1654 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