Security readout for executives and security teams
Plain-English summary
This flaw lets an unauthenticated remote attacker disrupt Cisco management portals by forcing logged-in administrators off the web interface. Repeated abuse could prevent teams from maintaining administrative sessions during operations or incident response. The source bundle does not provide affected version ranges.
Executive priority
Treat as high priority for environments relying on affected Cisco management portals, especially if reachable beyond a restricted admin network. The main business risk is operational disruption of infrastructure management, not data theft based on the provided sources.
Technical view
CVE-2019-12634 is a missing authentication check in an API call in the web-based management interface. A request to an affected system can log off all currently authenticated users; repeated requests can prevent stable portal sessions. CVSS 3.0 is 8.6 with network access, low complexity, no privileges, and high availability impact.
Likely exposure
Exposure is most likely where Cisco IMC Supervisor, Cisco UCS Director, or Cisco UCS Director Express for Big Data management interfaces are reachable by untrusted networks. Version specificity is incomplete in the provided sources.
Exploitation context
The bundle marks this CVE as not in CISA KEV and provides no cited evidence of active exploitation. The attack requires only network reachability to the affected management interface, but the provided sources do not include exploit tooling or public exploitation details.
Researcher notes
Evidence supports unauthenticated remote denial of service through a missing API authentication check. Confidentiality and integrity impacts are listed as none. The source bundle lacks affected version ranges, patch details, and exploitation evidence beyond vendor and CVE records.
Mitigation direction
- Check Cisco’s advisory for affected releases, fixed versions, and official workarounds.
- Inventory Cisco IMC Supervisor, UCS Director, and UCS Director Express for Big Data deployments.
- Limit management interface reachability to trusted administrative networks only.
- Prioritize remediation for internet-exposed or broadly reachable management portals.
- Monitor vendor guidance because the provided source bundle lacks full version detail.
Validation and detection
- Confirm whether the named Cisco products exist in the environment.
- Review management interface exposure from untrusted or broad internal networks.
- Check installed versions against Cisco’s advisory, not only this summary.
- Review logs for repeated administrator session termination patterns.
- Verify remediation by confirming administrators can maintain stable web sessions.
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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CWE-264: Exact CWE lookup
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Open ATT&CK lookupCVE-2019-12634 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
- 20190821 Cisco Integrated Management Controller Supervisor, Cisco UCS Director, and Cisco UCS Director Express for Big Data 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.
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.