Security readout for executives and security teams
This issue affects Cisco FXOS and NX-OS devices using Cisco Discovery Protocol. An attacker already on the same Layer 2 network segment could send a crafted discovery packet and potentially take over the device as root or crash it. It is most urgent for environments where affected Cisco infrastructure has CDP enabled on reachable links. Exposure is limited to affected Cisco Firepower, MDS, Nexus, and UCS Fabric Interconnect platforms when Cisco Discovery Protocol is enabled. The attacker must be Layer 2 adjacent, so internet exposure is not indicated by the supplied sources. Treat as high priority for data center, firewall, storage, and fabric switching environments. The business risk is loss of network infrastructure control or availability, but exploitation is constrained by Layer 2 adjacency and CDP configuration. Mitigation focus: Check Cisco advisory cisco-sa-20180620-fxnxos-dos for affected releases and fixed software guidance.; Prioritize updates for affected Cisco infrastructure with CDP enabled on reachable links.; Disable Cisco Discovery Protocol where it is not operationally required..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CWE-20: Exact CWE lookup
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Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2018-0303 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180620-fxnxos-dosCVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.