Security readout for executives and security teams
Plain-English summary
CVE-2021-1253 affects Cisco Data Center Network Manager's web management interface. A lower-privileged network-operator user could cause another interface user to encounter cross-site scripting or reflected file download behavior. The business risk is moderate because exploitation requires privileges and user interaction, but compromise of a data center management console can still create meaningful operational risk.
Executive priority
Treat this as a moderate-priority management-plane issue. It is not described as unauthenticated or actively exploited, but DCNM controls sensitive data center operations, so exposed or broadly delegated deployments deserve timely review and vendor-guided remediation.
Technical view
Cisco describes multiple input-validation vulnerabilities in DCNM's web-based management interface. The CVSS 3.1 vector is AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L with score 6.5. Impact is limited confidentiality, integrity, and availability across a changed scope. The source bundle does not identify exact affected versions or fixed releases.
Likely exposure
Exposure is likely limited to organizations running Cisco Data Center Network Manager with the web interface reachable to network-operator users. The provided sources do not list affected version ranges, so vulnerability managers must map installed DCNM versions against Cisco's advisory.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation. Exploitation is described as remote but requires network-operator privileges and user interaction, making broad unauthenticated internet exploitation unsupported by the cited evidence.
Researcher notes
Evidence supports XSS/RFD risk caused by input-validation weaknesses in Cisco DCNM's web interface. The bundle lacks version-level applicability, patch identifiers, exploit observations, and detailed vulnerability mechanics. Avoid assuming exploitability beyond PR:L and UI:R constraints.
Mitigation direction
- Review Cisco's advisory for affected versions, fixed releases, and official workarounds.
- Inventory all Cisco DCNM deployments and record exact installed versions.
- Restrict DCNM web management access to trusted administrative networks where feasible.
- Review network-operator accounts and remove unnecessary privileges.
- Prioritize remediation for DCNM instances managing critical data center infrastructure.
Validation and detection
- Confirm whether each installed DCNM version matches Cisco's affected product guidance.
- Verify DCNM web interface exposure paths and allowed user groups.
- Check whether network-operator accounts are still required and appropriately scoped.
- Review change records for Cisco-recommended updates or workarounds.
- Document any unsupported or unverified DCNM versions as residual risk.
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-20: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-1253 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
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:C/C:L/I:L/A:L2.33.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- 20210120 Cisco Data Center Network Manager 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.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.