Security readout for executives and security teams
Plain-English summary
Cisco Umbrella report and audit-log exports could carry injected formulas or links. The business risk is not server takeover; it is users opening trusted-looking exported data and triggering unwanted spreadsheet or link behavior.
Executive priority
Handle as a controlled medium-priority remediation. Prioritize environments where many users receive Umbrella reports or where report recipients handle sensitive operational data.
Technical view
The cited issue covers authenticated, remote formula and link injection in Cisco Umbrella Admin audit log export and Scheduled Reports features. CVSS 3.1 is 6.5 with low privileges and user interaction required, scope changed, and low confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most likely where Cisco Umbrella administrators or report recipients export or open audit logs and scheduled reports, especially CSV-style output, from affected Cisco Umbrella environments.
Exploitation context
The provided sources do not show KEV listing or active exploitation. The scenario requires an authenticated remote attacker and user interaction, reducing urgency versus unauthenticated remote code execution but still creating phishing and data-handling risk.
Researcher notes
Evidence is limited to the CVE metadata and Cisco advisory reference. Do not assume specific vulnerable versions, exploit availability, or patch details beyond Cisco’s advisory without reviewing the vendor page.
Mitigation direction
- Review Cisco’s advisory for official remediation or fixed-release guidance.
- Restrict Umbrella export and scheduled-report access to trusted users.
- Treat exported reports as untrusted until vendor guidance is applied.
- Reduce unnecessary scheduled report recipients and distribution lists.
- Train administrators not to open unexpected exported report files or links.
Validation and detection
- Confirm whether Cisco Umbrella Insights Virtual Appliance is in use.
- Identify users with Admin audit log export permissions.
- Review Scheduled Reports configurations and recipient lists.
- Check whether exported reports are opened in spreadsheet applications.
- Document remediation status against Cisco’s advisory.
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-1236: 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-2021-1475 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
- 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
- 20210407 Cisco Umbrella Link and CSV Formula Injection 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 Neutralization of Formula Elements in a CSV File
Improper Neutralization of Formula Elements in a CSV File represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.