Security readout for executives and security teams
Plain-English summary
Cisco Data Center Network Manager had REST API authorization flaws that could let a logged-in remote attacker view, change, or delete data they should not control. The public bundle does not show active exploitation or exact affected versions, so urgency depends on whether DCNM is deployed and who can authenticate to it.
Executive priority
Treat as a moderate-priority network-management control issue. Prioritize remediation if DCNM manages sensitive infrastructure, has many users, or is reachable beyond trusted administration networks. No source provided evidence of active exploitation.
Technical view
CVE-2021-1133 covers multiple Cisco DCNM REST API endpoint vulnerabilities. The issue is mapped to CWE-184 and has CVSS 3.1 score 4.6: network-reachable, low complexity, low privileges, user interaction required, with low confidentiality and integrity impact and no availability impact.
Likely exposure
Exposure is most likely in environments running Cisco Data Center Network Manager where authenticated users or compromised accounts can reach the REST API. The source bundle lists affected versions as n/a, so version-specific exposure must be confirmed from Cisco guidance.
Exploitation context
The provided sources do not indicate known exploitation, and the CVE is not listed as KEV. Abuse requires authentication and user interaction per the CVSS vector, which lowers broad internet-scale risk but still matters in privileged network-management environments.
Researcher notes
Evidence is limited to the CVE record and Cisco advisory reference in the bundle. Do not assume affected versions, exploit maturity, or a specific patch path without checking Cisco’s advisory. Focus validation on authorization boundaries around authenticated REST API access.
Mitigation direction
- Review Cisco advisory guidance for affected releases and supported remediation.
- Inventory Cisco DCNM deployments and owners.
- Restrict DCNM and REST API reachability to trusted management paths.
- Review DCNM accounts and remove unnecessary authenticated access.
- Monitor DCNM changes for unauthorized data modification or deletion.
Validation and detection
- Confirm deployed DCNM versions against the Cisco advisory.
- Identify who can authenticate to DCNM and API interfaces.
- Verify REST API access is not exposed to untrusted networks.
- Review logs for unexpected view, modify, or delete activity.
- Document compensating controls where immediate remediation is unavailable.
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-184: 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-2021-1133 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
- 4.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/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:R/S:U/C:L/I:L/A:N2.12.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.6MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20210120 Cisco Data Center Network Manager REST API VulnerabilitiesCVE 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.
Incomplete List of Disallowed Inputs
Incomplete List of Disallowed Inputs represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.