Security readout for executives and security teams
Plain-English summary
This issue lets a highly privileged iDRAC9 user store malicious browser content in the management interface. Another user viewing that stored content could have script run in their browser session. Business urgency is moderate because exploitation requires high privileges and user interaction, but iDRAC is a sensitive server-management surface.
Executive priority
Treat as a scheduled medium-priority firmware and access-control task. It is not presented as actively exploited, but iDRAC controls server management functions, so exposed or broadly administered environments deserve faster handling.
Technical view
Dell EMC iDRAC9 versions prior to 4.40.00.00 contain multiple stored cross-site scripting flaws in multiple affected parameters. The CVSS 3.1 score is 4.8: network reachable, low attack complexity, high privileges required, user interaction required, changed scope, low confidentiality and integrity impact, no availability impact.
Likely exposure
Organizations using Dell EMC iDRAC9 firmware earlier than 4.40.00.00 may be exposed. Exposure is most relevant where high-privilege iDRAC users can submit data later viewed by other users through the web interface.
Exploitation context
The provided sources do not report active exploitation, and this CVE is not listed as KEV. Exploitation requires a remote authenticated user with high privileges and a victim user viewing the stored data in a browser.
Researcher notes
Evidence is limited to CVE metadata and Dell’s referenced advisory. The sources identify stored XSS, CWE-79, affected iDRAC9 versions prior to 4.40.00.00, and the privilege and interaction requirements, but do not provide parameter names or exploit evidence.
Mitigation direction
- Upgrade affected iDRAC9 firmware to 4.40.00.00 or later per Dell guidance.
- Check Dell advisory 000185293 for any product-specific remediation details.
- Restrict iDRAC access to trusted administrators and management networks.
- Review high-privilege iDRAC accounts for necessity and least privilege.
Validation and detection
- Inventory Dell EMC iDRAC9 instances and record firmware versions.
- Flag any iDRAC9 firmware earlier than 4.40.00.00.
- Confirm iDRAC web access is limited to management networks.
- Review administrative account assignments for unnecessary high privileges.
- Check Dell advisory 000185293 against local firmware and configuration state.
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-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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-2021-21543 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
- 4.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/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:H/UI:R/S:C/C:L/I:L/A:N1.72.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.8MediumVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.dell.com/support/kbdoc/000185293CVE 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 Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.