Unified Computing System Infrastructure And Unified Computing System SoftwareOperating system · Cisco
CVE-2012-1339
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 Fabric Interconnect component in Cisco Unified Computing System (UCS) 2.0 allows remote attackers to cause a denial of service (process crash) via an attempted SSH session, aka Bug ID CSCtt94543.
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 confidenceThe Fabric Interconnect component in Cisco Unified Computing System (UCS) version 2.0 contains a denial-of-service vulnerability where remote attackers can crash a process by initiating an SSH session. The vulnerability is triggered during the SSH authentication attempt, causing the affected process to fail.
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
Unified Computing System Infrastructure And Unified Computing System SoftwareOperating system
= 2.0\(1q\)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
- Authentication
- None
- Confidentiality
- None
- Integrity
- None
- Availability
- Partial
AV:N/AC:L/Au:N/C:N/I:N/A:P
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 Cisco UCS Fabric Interconnect versionLog into UCS Manager or use CLI command 'show version' on the Fabric Interconnect to display the running software versionAffected if The version displayed is 2.0(1q) or falls within the 2.0.x release train
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Verify SSH service is enabled on Fabric InterconnectCheck the Fabric Interconnect configuration using 'show running-config | include ssh' or access UCS Manager to verify SSH service status under the Management -> Services sectionAffected if SSH is enabled and running on the Fabric Interconnect (the vulnerability is triggered during SSH authentication attempt)
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Determine SSH accessibility from networkUse 'show ip access-list' or network scanning from external locations to determine if TCP port 22 (SSH) is reachable from management networks or untrusted sourcesAffected if SSH port 22 on the Fabric Interconnect is accessible from networks outside trusted management interfaces
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Confirm Fabric Interconnect model and software trainUse 'show inventory' or UCS Manager to confirm the device is a Fabric Interconnect running Cisco UCS Infrastructure software, not third-party or standalone networking gearAffected if The device is a Cisco UCS Fabric Interconnect running the 2.0 infrastructure software train
You are affected if your Fabric Interconnect runs version 2.0(1q) with SSH enabled and accessible from your network, allowing remote attackers to trigger the DoS during SSH authentication.
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 relevant Cisco patch (referenced as CSCtt94543) to upgrade the UCS Fabric Interconnect beyond version 2.0. Until patched, restrict SSH access to the Fabric Interconnect to trusted management networks only.
Fix this in Unified Computing System Infrastructure And Unified Computing System Software
Scoped from the published advisory
- Consultation3.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2012-1339 — 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-2012-1339 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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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.
- 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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