Security readout for executives and security teams
Plain-English summary
Cisco UCS Central may improperly validate certificates during UCS Manager registration. An authenticated attacker with adjacent access could register a rogue UCS Manager and view UCS Central data and UCSM inventory data. This is medium business risk because it targets infrastructure management information but requires authentication and limited network positioning.
Executive priority
Handle in normal vulnerability management cycles unless UCS Central is exposed beyond trusted management networks or suspicious registrations appear. Prioritize validation because infrastructure inventory data may assist later attacks.
Technical view
CVE-2021-1354 is a CWE-295 improper certificate validation flaw in Cisco Unified Computing System Central Software. The vulnerable certificate registration process can accept a crafted HTTP registration API request, allowing rogue UCSM registration. CVSS 3.1 is 4.3, with low confidentiality impact and no stated integrity or availability impact.
Likely exposure
Exposure is limited to organizations running Cisco Unified Computing System Central Software with reachable UCSM registration functionality. The source bundle does not identify affected versions, fixed releases, internet exposure patterns, or deployment prevalence.
Exploitation context
The sources describe an authenticated attacker with adjacent access and a crafted registration API request. CISA KEV status is false, and the provided sources do not state active exploitation or public exploit availability.
Researcher notes
Key gaps are version-specific affected data, fixed release details, workaround details, and exploitation evidence. Treat the registration API and certificate trust path as the research focus, but avoid assuming exploitability beyond the authenticated adjacent scenario described.
Mitigation direction
- Review Cisco’s advisory for affected and fixed release guidance.
- Inventory Cisco UCS Central Software deployments and ownership.
- Restrict UCS Central management access to trusted administrative networks.
- Review UCSM registration trust and remove unauthorized registrations.
- Monitor for unexpected UCSM registration events or inventory access.
Validation and detection
- Confirm whether Cisco UCS Central Software is deployed.
- Check deployed versions against Cisco’s advisory and support guidance.
- Review UCS Central for unknown or unauthorized UCSM registrations.
- Verify management interfaces are not broadly reachable.
- Inspect logs for unusual registration activity.
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-295: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-1354 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
- 4.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/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:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20210203 Cisco Unified Computing System Central Software Improper Certificate Validation 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 Certificate Validation
Improper Certificate Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.