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Junos Os EvolvedOperating system · Juniper

CVE-2020-1620

MEDIUM · 5.5 CVSS v3.1 Published 2020-04-08
Fix available
A fix is available. Upgrade to 19.3r1 or later.
See remediation →
57/100
Remediation priority · Elevated
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
A local, authenticated user with shell can obtain the hashed values of login passwords via configd streamer log. This issue affects all versions of Junos OS Evolved prior to 19.3R1.

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 · moderate confidence

A local authenticated user with shell access can obtain hashed login passwords by reading the configd streamer log in Junos OS Evolved. This is an information disclosure vulnerability where password hashes are being written to log files that are accessible to authenticated local users.

MitigationUpgrade Junos OS Evolved to version 19.3R1 or later which contains the fix preventing password hashes from being written to the configd streamer log.

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
Junos Os EvolvedOperating system
Affected:< 19.3r1

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
None
Availability
None

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

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 Junos OS Evolved version
    Run 'show version' or 'cat /etc/version' to determine the installed Junos OS Evolved version
    Affected if Version is earlier than 19.3r1 (e.g., 19.2.x, 19.1.x, earlier releases)
  2. Locate the configd streamer log file
    Check for the presence of /var/log/configd_streamer or similar configd log paths using 'ls -la /var/log/ | grep configd'
    Affected if The configd streamer log file exists on the system
  3. Examine the log for password hash entries
    Search the configd log file for patterns indicating password hashes: 'grep -i 'password' /var/log/configd_streamer' or review the log content directly
    Affected if The log file contains plaintext password strings or hashed password values (look for $ identifiers or repeated hash patterns)
  4. Verify shell access capability
    Confirm local authenticated users have shell access by checking for /bin/bash or /bin/sh availability for non-root users
    Affected if Local users can access the shell and read log files in /var/log/

A system is affected if it runs Junos OS Evolved versions earlier than 19.3r1 AND the configd streamer log contains password hash entries accessible to local authenticated users.

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.

From vendor data
Upgrade available Upgrade to 19.3r1 or later
Fixed in 19.3r1
Interim mitigation

Upgrade Junos OS Evolved to version 19.3R1 or later which contains the fix preventing password hashes from being written to the configd streamer log.

Fix this in Junos Os Evolved Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing3.0 h
  • Review / QA2.0 h
14.0 hours of engineering $2,490
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,984.

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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-2020-1620 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