CVE-2015-7752
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 · uneditedThe SSH server in Juniper Junos OS before 12.1X44-D50, 12.1X46 before 12.1X46-D35, 12.1X47 before 12.1X47-D25, 12.3 before 12.3R10, 12.3X48 before 12.3X48-D10, 13.2 before 13.2R8, 13.2X51 before 13.2X51-D35, 13.3 before 13.3R6, 14.1 before 14.1R5, 14.1X53 before 14.1X53-D25, 14.2 before 14.2R3, 15.1 before 15.1R1, and 15.1X49 before 15.1X49-D20 allows remote attackers to cause a denial of service (CPU consumption) via unspecified SSH traffic.
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 confidenceThe SSH server daemon in Juniper Junos OS contains a vulnerability allowing remote unauthenticated attackers to cause excessive CPU consumption through specially crafted SSH traffic, resulting in denial of service due to resource exhaustion.
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= 12.1x44= 12.1x46= 12.1x47= 12.3= 12.3x48= 13.2= 13.2x51= 13.3= 14.1= 14.1x53= 14.2= 15.1CVSS 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
- Authentication
- None
- Confidentiality
- None
- Integrity
- None
- Availability
- Complete
AV:N/AC:L/Au:N/C:N/I:N/A:C
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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Check Junos OS versionRun 'show version' on the device CLI to retrieve the installed Junos version.Affected if The displayed version matches one of the affected versions: 12.1X44, 12.1X46, 12.1X47, 12.3, 12.3X48, 13.2, 13.2X51, 13.3, 14.1, 14.1X53, 14.2, or 15.1.
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Verify SSH server is enabledRun 'show system services ssh' to confirm the SSH service is active and accepting connections.Affected if SSH service is enabled and running on the device.
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Confirm SSH is network accessibleCheck firewall policies or access lists to determine if TCP port 22 is open to untrusted networks. Review configuration with 'show configuration firewall' or equivalent policies.Affected if SSH is reachable from networks that are not explicitly trusted.
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Check for resource exhaustion symptomsMonitor CPU usage with 'show system processes extensive' during SSH traffic. Look for abnormally high CPU utilization associated with the sshd process.Affected if CPU consumption spikes excessively when SSH traffic is processed, indicating potential exploitation.
The device is affected if it runs a vulnerable Junos version (12.1X44 through 15.1) with SSH enabled and accessible from untrusted networks, and exhibits high CPU usage under SSH traffic.
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 dataApply the appropriate Junos OS patch (12.1X44-D50+, 12.1X46-D35+, 12.1X47-D25+, 12.3R10+, 12.3X48-D10+, 13.2R8+, 13.2X51-D35+, 13.3R6+, 14.1R5+, 14.1X53-D25+, 14.2R3+, 15.1R1+, or 15.1X49-D20+) to address the SSH server vulnerability. Until upgrade is possible, restrict SSH access to trusted networks via firewall or access lists.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2015-7752 — 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-2015-7752 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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