Security readout for executives and security teams
Plain-English summary
CVE-2020-3247 is a critical Cisco UCS Director REST API issue. A remote unauthenticated attacker may bypass authentication or perform directory traversal against an affected device, creating potential business risk to infrastructure management systems and the workloads they administer.
Executive priority
Treat as urgent for any exposed Cisco UCS Director deployment. The flaw affects infrastructure management software and is remotely reachable without credentials, so confirmed exposure should drive immediate containment and vendor-guided remediation.
Technical view
The source bundle describes multiple REST API vulnerabilities in Cisco UCS Director and Cisco UCS Director Express for Big Data. CVSS 3.0 is 9.8: network-reachable, low complexity, no privileges, no user interaction, with high confidentiality, integrity, and availability impact. CWE-20 indicates improper input validation.
Likely exposure
Exposure is most likely where Cisco UCS Director management/API interfaces are deployed and reachable from untrusted networks. The bundle does not provide affected version ranges, so asset owners must verify exact product and release exposure against Cisco’s advisory.
Exploitation context
The CVE is not listed as KEV in the provided bundle. The sources support remote unauthenticated attack potential, but do not establish active exploitation. ZDI and Cisco references indicate public disclosure and vendor advisory coverage.
Researcher notes
Do not assume all Cisco UCS Director versions are affected from this bundle alone. The key research task is version mapping against Cisco’s advisory, then validating network reachability and management-plane segmentation without performing offensive reproduction.
Mitigation direction
- Review Cisco’s advisory for affected releases and official fixed software guidance.
- Inventory Cisco UCS Director and Express for Big Data deployments.
- Restrict REST API and management access to trusted administrative networks.
- Remove any unnecessary internet exposure for UCS Director interfaces.
- Prioritize remediation before routine maintenance windows where exposure is confirmed.
Validation and detection
- Confirm whether Cisco UCS Director is present in asset inventory.
- Check product version against Cisco’s affected and fixed release guidance.
- Verify management and REST API interfaces are not publicly reachable.
- Review logs for unusual API access or directory traversal indicators.
- Document remediation status and remaining exposure exceptions.
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-20: 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 lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-3247 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
- Critical
- CVSS
- 9.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
9.8CriticalVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20200415 Multiple Vulnerabilities in Cisco UCS Director and Cisco UCS Director Express for Big DataCVE reference · vendor-advisory, x_refsource_CISCO
- https://www.zerodayinitiative.com/advisories/ZDI-20-541/CVE reference · x_refsource_MISC
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 Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.