CVE-2017-3752
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 industry-wide vulnerability has been identified in the implementation of the Open Shortest Path First (OSPF) routing protocol used on some Lenovo switches. Exploitation of these implementation flaws may result in attackers being able to erase or alter the routing tables of one or many routers, switches, or other devices that support OSPF within a routing domain.
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 confidenceLenovo switches contain implementation flaws in the OSPF (Open Shortest Path First) routing protocol that allow remote attackers to manipulate routing tables. By exploiting these vulnerabilities, attackers within the routing domain can erase or alter OSPF routing information, potentially causing traffic redirection or network disruption.
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<= 21.0.24.0<= 7.4.16.0<= 5.3.10.0<= 7.8.12.0<= 7.8.16.0<= 7.8.16.0<= 7.8.16.0<= 7.9.19.0CVSS 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
- Adjacent
- Complexity
- High
- Privileges
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- High
- Availability
- High
CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:C/C:L/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 switch modelRun 'show system' or check the physical label to determine the exact switch model (e.g., G8052, EN4093, CN4093, EN2092)Affected if The model matches one of the affected products listed in the CVE (Ibm 1g L2 7 Slb, Ibm 1, Ibm Layer 2/3 Copper, Ibm Virtual Fabric 10gb, Ibm En2092, Ibm Fabric Cn4093, Ibm Fabric En4093/en4093r, Ibm G8052)
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Check the firmware versionRun 'show version' or 'show firmware' to retrieve the current firmware version installed on the switchAffected if The firmware version is at or below the affected version threshold for your specific model (see CVE affected versions list)
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Verify if OSPF is enabledRun 'show ip ospf' or 'show ip ospf interface' to check if OSPF routing protocol is configured and active on any interfaceAffected if OSPF is enabled and the switch is participating in OSPF routing
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Check OSPF authentication configurationRun 'show ip ospf interface' and look for the 'Authentication' field, or check OSPF area configuration with 'show ip ospf area' to see if MD5 or simple password authentication is configuredAffected if No OSPF authentication is configured (the authentication field shows 'none' or is blank)
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Review OSPF neighbor adjacenciesRun 'show ip ospf neighbor' to list all OSPF neighbors and verify they are expected routers within your trusted networkAffected if Unrecognized or unexpected OSPF neighbors are present in the routing domain
A user is affected if they have one of the listed switch models running firmware at or below the specified version AND have OSPF enabled without proper authentication configured.
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 vendor firmware updates to affected Lenovo switches and implement OSPF authentication (e.g., OSPF MD5 authentication) to prevent unauthorized routing updates from untrusted sources.
- Consultation6.0 h
- Implementation12.0 h
- Testing8.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $8,448.
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Free · runs locallyCheck whether your project pulls in CVE-2017-3752 — 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-2017-3752 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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