Security readout for executives and security teams
Plain-English summary
CVE-2021-1350 is a denial-of-service weakness in Cisco Umbrella’s web UI. An unauthenticated remote attacker could degrade dashboard performance by overwhelming insufficient rate limiting. The sources describe availability impact only, not data theft or system takeover. Cisco says it addressed the vulnerability.
Executive priority
Treat as a moderate availability risk. Prioritize confirmation that Cisco’s addressed remediation applies to your environment, especially if operations depend on Umbrella dashboard availability during incidents or policy administration.
Technical view
The issue is insufficient rate limiting/resource control in the Cisco Umbrella web UI, mapped to CWE-770. CVSS 3.1 is 5.3: network exploitable, low complexity, no privileges or user interaction, unchanged scope, and low availability impact only.
Likely exposure
Exposure is most relevant for organizations using Cisco Umbrella web UI/dashboard components, including the listed Cisco Umbrella Insights Virtual Appliance. The bundle does not provide affected version ranges, CPEs, or deployment-specific exposure details.
Exploitation context
The bundle does not show active exploitation, and KEV is false. Exploitation is described as unauthenticated remote traffic that can degrade web UI performance. The documented impact is service performance disruption, not confidentiality or integrity compromise.
Researcher notes
Evidence is limited to the CVE record and Cisco advisory metadata in the bundle. No affected version range, patch identifier, workaround detail, or public exploitation evidence is provided here. Do not infer broader Cisco Umbrella component impact beyond the cited sources.
Mitigation direction
- Review Cisco advisory cisco-sa-umb-dos-dgKzDEBP for remediation status.
- Confirm the Cisco Umbrella deployment is in a Cisco-addressed state.
- Restrict unnecessary exposure to the Umbrella web UI where operationally feasible.
- Monitor dashboard performance and error rates for unusual sustained traffic.
Validation and detection
- Inventory Cisco Umbrella dashboard and Insights Virtual Appliance usage.
- Check Cisco advisory records against the organization’s deployed service state.
- Confirm security monitoring covers web UI availability degradation.
- Verify incident records for unexplained Umbrella dashboard performance issues.
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-770: 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-2021-1350 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
- 5.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:N/UI:N/S:U/C:N/I:N/A:L3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source materials
- CVE List V5 sourceCVE List V5
- 20210120 Cisco Umbrella Dashboard Packet Flood 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.
Allocation of Resources Without Limits or Throttling
Allocation of Resources Without Limits or Throttling represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.