CVE-2015-7754
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 · uneditedJuniper ScreenOS before 6.3.0r21, when ssh-pka is configured and enabled, allows remote attackers to cause a denial of service (system crash) or execute arbitrary code via crafted SSH negotiation.
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 confidenceThis vulnerability affects Juniper ScreenOS VPN/firewall devices prior to version 6.3.0r21. When the SSH public key authentication (ssh-pka) feature is configured and enabled, remote attackers can send crafted SSH negotiation messages to cause either a denial of service (system crash) or execute arbitrary code on the affected device.
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<= 6.3.0CVSS 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
- High
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.0/AV:N/AC:H/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 checksWork through these to decide whether this CVE applies to you.
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Identify the device and operating systemRun 'get version' or 'show version' on the device console to confirm it is a Juniper ScreenOS deviceAffected if The device is not running Juniper ScreenOS (not applicable)
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Check the ScreenOS versionReview the version number output from 'get version' or 'show version' and compare it to the affected range of versions prior to 6.3.0r21Affected if The installed version is 6.3.0 or any version lower than 6.3.0r21
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Verify SSH is enabledRun 'get ssh' or 'show ssh' to check if SSH service is configured on the deviceAffected if SSH is not enabled on the device (not affected)
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Check if SSH public key authentication (ssh-pka) is configuredRun 'get ssh pubkey-authentication' or 'show ssh pka' to determine whether the ssh-pka feature is enabledAffected if The ssh-pka feature is enabled - this is the condition required for the vulnerability to be exploitable
The device is affected if it runs ScreenOS version 6.3.0 or lower AND has the SSH public key authentication (ssh-pka) feature enabled.
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.
From vendor dataUpgrade Juniper ScreenOS to version 6.3.0r21 or later. If immediate patching is not feasible, consider disabling the ssh-pka feature or restricting SSH access to trusted management networks until the upgrade can be scheduled.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2015-7754 — 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-2015-7754 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
- No weaponised exploit code, or anything meant to cause harm
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