Security readout for executives and security teams
Plain-English summary
Cisco HyperFlex Software used insufficient key management, creating a risk that someone who obtained a specific cluster encryption key could intercept traffic between cluster nodes. The sources describe confidentiality and integrity risk, not service outage. Public evidence provided here does not show active exploitation.
Executive priority
Treat as a moderate-priority infrastructure risk. It can affect data confidentiality and integrity inside HyperFlex clusters, but exploitation requires a specific cluster key and no active exploitation is evidenced in the provided sources.
Technical view
CVE-2019-12621 affects Cisco HyperFlex HX-Series via CWE-320 key management weakness. The CVSS 3.0 score is 6.8 with network attack vector, high attack complexity, no privileges, user interaction required, high confidentiality and integrity impact, and no availability impact.
Likely exposure
Exposure is limited to organizations running Cisco HyperFlex HX-Series clusters with affected Cisco HyperFlex Software. The provided sources do not specify exact vulnerable versions or deployment conditions beyond Cisco HyperFlex Software.
Exploitation context
The attacker would need to obtain a specific encryption key for the cluster, making exploitation non-trivial. The provided data says KEV is false and includes no cited evidence of exploitation in the wild.
Researcher notes
The strongest evidence is the CVE record and Cisco advisory reference. Key gaps are exact affected versions, fixed releases, and any practical detection guidance. Avoid claims about exploit maturity without additional cited sources.
Mitigation direction
- Review Cisco's advisory for affected releases and official remediation guidance.
- Do not assume a fix; verify Cisco-published fixed software or workarounds.
- Track all HyperFlex clusters until their remediation status is documented.
- Escalate vendor support if exact affected versions are unclear.
Validation and detection
- Inventory Cisco HyperFlex HX-Series deployments and software versions.
- Compare each deployment against Cisco's advisory and support guidance.
- Confirm whether cluster communication paths are reachable from untrusted networks.
- Document compensating controls and remediation owner for each cluster.
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-320: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2019-12621 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
- Medium
- CVSS
- 6.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/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:H/PR:N/UI:R/S:U/C:H/I:H/A:N1.65.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.8MediumVector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20190821 Cisco HyperFlex Static SSL Key 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.
Key Management Errors
Key Management Errors represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.