Security readout for executives and security teams
Plain-English summary
This Cisco flaw can let a logged-in remote attacker crash the SNMP service on affected FXOS or NX-OS devices. Repeated crashes may trigger a full device restart, creating a denial-of-service risk for network or compute infrastructure managed through those platforms.
Executive priority
Treat this as a high-priority availability risk for affected Cisco management infrastructure. It is not described as data theft or code execution, but a forced restart of network or compute platforms can disrupt operations and should be remediated through Cisco guidance.
Technical view
CVE-2019-1963 is an authenticated SNMP packet-processing flaw caused by improper validation of ASN.1-encoded variables. Cisco rates it CVSS 3.0 7.7. Successful exploitation can repeatedly restart the SNMP application and potentially cause a system-level restart. Confidentiality and integrity impact are not described.
Likely exposure
Exposure is most likely where Cisco FXOS or NX-OS systems, including listed Cisco Unified Computing System managed environments, have SNMP enabled and reachable by users or systems with valid SNMP access. The source bundle does not provide exact affected version ranges.
Exploitation context
The CVE is not listed as KEV, and the provided sources do not state active exploitation. Exploitation requires authenticated remote access to SNMP, which reduces broad internet risk but remains serious in management networks where SNMP credentials are shared or weakly controlled.
Researcher notes
Key constraints are authentication and SNMP reachability. The public bundle identifies improper ASN.1 variable validation in the SNMP input packet processor, but does not include version-specific affected ranges, fixed releases, exploit evidence, or vendor workaround details beyond the Cisco advisory reference.
Mitigation direction
- Review Cisco advisory for affected releases and fixed software guidance.
- Prioritize updates on SNMP-enabled FXOS and NX-OS management-plane systems.
- Restrict SNMP access to trusted management networks and hosts.
- Review SNMP credentials and remove unnecessary authenticated access.
- Monitor for repeated SNMP application restarts or device reboots.
Validation and detection
- Inventory Cisco FXOS and NX-OS devices with SNMP enabled.
- Compare running versions against Cisco advisory guidance.
- Confirm SNMP is unreachable from untrusted networks.
- Review logs for SNMP daemon restarts and system-level restarts.
- Verify only approved administrators and monitoring systems have SNMP access.
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
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Open ATT&CK lookupCVE-2019-1963 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 7.7 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:L/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:L/UI:N/S:C/C:N/I:N/A:H3.14Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
7.7HighVector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20190828 Cisco FXOS and NX-OS Software Authenticated Simple Network Management Protocol 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.