Security readout for executives and security teams
Plain-English summary
CVE-2019-1962 is a Cisco NX-OS denial-of-service flaw. A remote unauthenticated attacker could crash affected processes and force a device reload if Cisco Fabric Services over IP is enabled. CFSoIP is disabled by default, so business urgency depends on whether this feature is configured in the environment.
Executive priority
Prioritize validation on critical Cisco network infrastructure. If CFSoIP is enabled, remediation should be treated as high priority because exploitation could interrupt network or data-center availability. If CFSoIP is not enabled, urgency is lower but inventory confirmation is still needed.
Technical view
The issue is insufficient validation of TCP packets in the Cisco Fabric Services component when using the CFSoIP distribution method. A malicious Cisco Fabric Services TCP packet can cause process crashes, device reload, and availability loss. The provided source identifies Cisco Unified Computing System (Managed) as affected, with versions unspecified.
Likely exposure
Exposure is most likely limited to Cisco NX-OS environments using Cisco Fabric Services over IP. The source states CFSoIP is disabled by default and only this CFS distribution method is affected. Assets without CFSoIP enabled are less likely to be exposed based on the provided evidence.
Exploitation context
The CVE is network-reachable, unauthenticated, low-complexity, and impacts availability only. The provided bundle does not show CISA KEV listing or active exploitation evidence. Treat this as a credible DoS risk, not as confirmed exploited in the wild.
Researcher notes
Evidence is clear on attack class, preconditions, and impact, but incomplete on exact affected versions and fixed releases in the supplied bundle. Research should focus on CFSoIP enablement, Cisco advisory version mapping, and operational blast radius from device reloads.
Mitigation direction
- Identify Cisco NX-OS assets where CFSoIP is enabled.
- Disable CFSoIP where it is not operationally required.
- Review Cisco’s advisory for affected and fixed release guidance.
- Prioritize updates for externally reachable or critical network devices.
- Monitor affected devices for unexpected process crashes or reloads.
Validation and detection
- Inventory Cisco NX-OS and managed UCS assets.
- Confirm whether Cisco Fabric Services over IP is configured.
- Map discovered versions against Cisco’s advisory.
- Check logs for reloads or CFS-related process crashes.
- Verify exposure is not reachable from untrusted networks.
Public sources used
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
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-20: Exact CWE lookup
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Open ATT&CK lookupCVE-2019-1962 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
- High
- CVSS
- 8.6 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H3.94Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
8.6HighVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20190828 Cisco NX-OS Software Cisco Fabric Services over IP Denial of Service VulnerabilityCVE reference · vendor-advisory, x_refsource_CISCO
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.