Security readout for executives and security teams
Plain-English summary
This is a critical Cisco UCS Director issue affecting its REST API. A remote attacker may bypass authentication or perform directory traversal against an affected device, creating potential for full compromise of confidentiality, integrity, and availability. The supplied sources do not identify active exploitation or exact affected versions.
Executive priority
Treat this as urgent for any environment running affected Cisco UCS Director products, especially if reachable from untrusted networks. Prioritize inventory, exposure reduction, and vendor-guided remediation.
Technical view
CVE-2020-3249 covers multiple REST API vulnerabilities in Cisco UCS Director and Cisco UCS Director Express for Big Data. The CVSS 3.0 score is 9.8 with network access, low complexity, no privileges, and no user interaction. The weakness is mapped to improper input validation, CWE-20.
Likely exposure
Exposure is most likely where Cisco UCS Director or Cisco UCS Director Express for Big Data is deployed and its REST API or management interface is reachable. The bundle does not provide exact affected version ranges.
Exploitation context
The vulnerability is remotely reachable and requires no authentication or user interaction, which makes exposed management surfaces high risk. The source bundle marks KEV as false and provides no cited evidence of active exploitation.
Researcher notes
The provided evidence confirms critical unauthenticated remote risk but does not include full version ranges, exploit details, or specific fixed builds. Avoid assuming exploitation until supported by KEV or another cited source.
Mitigation direction
- Review Cisco’s advisory for affected and fixed release guidance.
- Upgrade or patch according to Cisco’s documented remediation.
- Restrict access to UCS Director management and REST API interfaces.
- Remove internet exposure for affected management services where possible.
- Monitor Cisco guidance for version-specific workarounds or updates.
Validation and detection
- Inventory Cisco UCS Director and Express for Big Data deployments.
- Confirm product versions against Cisco’s advisory.
- Check whether REST API or management interfaces are externally reachable.
- Review access logs for unusual unauthenticated REST API activity.
- Verify remediation after applying Cisco-recommended updates.
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-2020-3249 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-20-544/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.