Security readout for executives and security teams
Plain-English summary
Cisco NX-OS devices may allow SNMP polling even when configured to block it, but only under a narrow configuration condition involving a 32-character ACL name. This could expose device management information or monitoring state that administrators intended to deny.
Executive priority
Treat this as a moderate network infrastructure risk. It is not described as code execution or outage-causing, but it can undermine management-plane access controls and expose operational device data if the narrow configuration condition exists.
Technical view
CVE-2019-1969 is an unauthenticated remote SNMP ACL bypass in Cisco NX-OS Software. The issue stems from an incorrect length check when the configured SNMP ACL name is exactly 32 ASCII characters. Successful exploitation allows SNMP polling that should have been denied.
Likely exposure
Exposure appears limited to Cisco NX-OS devices using the SNMP ACL feature where the configured ACL name is at the 32-character maximum. The provided source bundle does not identify specific fixed or affected NX-OS releases.
Exploitation context
The CVE describes network-reachable, unauthenticated exploitation with low attack complexity. The attacker must poll SNMP, but cannot control the device configuration or ACL name. The source bundle does not show CISA KEV listing or active exploitation evidence.
Researcher notes
The key exposure condition is the maximum-length SNMP ACL name. Sources do not provide exploit-in-the-wild evidence, exact affected version ranges, or patch details in the bundle. Analysis should stay tied to Cisco advisory data and local configuration review.
Mitigation direction
- Review Cisco’s advisory for affected releases, fixed software, and supported workarounds.
- Inventory Cisco NX-OS devices using SNMP ACLs.
- Identify SNMP ACL names that are exactly 32 ASCII characters.
- Prioritize remediation for devices reachable from untrusted or broad internal networks.
- Restrict SNMP management access through independent network controls where possible.
Validation and detection
- Check NX-OS SNMP ACL configurations and record ACL name lengths.
- Compare device software versions against Cisco’s advisory guidance.
- Review SNMP logs for unexpected polling from denied sources.
- Confirm management-plane access is restricted to approved monitoring systems.
- Track remediation status for each affected NX-OS device.
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
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ATT&CK lookup starting points
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CWE-264: Exact CWE lookup
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Open ATT&CK lookupCVE-2019-1969 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
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:L/A:N3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
5.8MediumVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20190828 Cisco NX-OS Software SNMP Access Control List Configuration Name Bypass 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.
Permissions, Privileges, and Access Controls
Permissions, Privileges, and Access Controls represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.