CVE-2024-39512
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 · uneditedAn Improper Physical Access Control vulnerability in the console port control of Juniper Networks Junos OS Evolved allows an attacker with physical access to the device to get access to a user account. When the console cable is disconnected, the logged in user is not logged out. This allows a malicious attacker with physical access to the console to resume a previous session and possibly gain administrative privileges. This issue affects Junos OS Evolved: * from 23.2R2-EVO before 23.2R2-S1-EVO, * from 23.4R1-EVO before 23.4R2-EVO.
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 confidenceA physical security vulnerability in Junos OS Evolved console port control fails to terminate user sessions when the console cable is disconnected. An attacker with physical access can reconnect to the console and resume a previously authenticated session, potentially gaining administrative privileges.
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= 23.2= 23.4CVSS 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
- Physical
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:P/AC:L/PR:N/UI:R/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 checksWork through these to decide whether this CVE applies to you.
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Identify Junos OS Evolved versionExecute 'show version' or 'show version detail' to display the installed Junos OS Evolved versionAffected if Version is exactly 23.2 or 23.4 (these are the affected versions listed)
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Verify console session exclusivity configurationReview the console configuration by running 'show configuration system console' or checking the active console configurationAffected if The console is NOT configured with exclusive-mode; without exclusive-mode, disconnected sessions can be resumed by reconnecting the cable
You are affected if your Junos OS Evolved version is exactly 23.2 or 23.4 AND your console is not configured with exclusive-mode, because the vulnerability allows session resumption after cable disconnect.
Generated from the published advisory. Verify against your own configuration.
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 · scopedApply vendor patches (23.2R2-S1-EVO or later, 23.4R2-EVO or later). Until patched, enforce strict physical access controls to console ports and consider using exclusive-mode configuration for console sessions.
23.2R2-S1-EVO or 23.4R2-EVO (or later)
- Verify current Junos OS Evolved version using "show version" command
- Schedule a maintenance window for the upgrade
- Back up current configuration using "request system backup" or equivalent
- Download the fixed release: 23.2R2-S1-EVO or later, or 23.4R2-EVO or later
- Upgrade the device using "request system software add <package>" command
- Reboot the device if required after upgrade
- Verify the new version is installed using "show version"
- Test console port behavior to confirm sessions are properly terminated on cable disconnect
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation2.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,152.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-39512 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2024-39512 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
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