CVE-2021-21543Network attack vector

Stored script execution via unneutralized parameters

Published Apr 30, 2021 · Updated Sep 16, 2024

Stored cross-site scripting in Dell Technologies iDRAC9 before 4.40.00.00 allows remote authenticated users to execute script in a victim's browser. The web interface stores HTML or JavaScript supplied through multiple affected parameters and later renders it without effective neutralization; Dell has not disclosed the parameter names. Exploitation requires high privileges and a victim to view the stored data, exposing that user's application-context data and actions.

CVSS severity4.8
Medium
EPSS probability0.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Dell Technologies iDRAC9 before 4.40.00.00 allows remote authenticated users to execute script in a victim's browser. The web interface stores HTML or JavaScript supplied through multiple affected parameters and later renders it without effective neutralization; Dell has not disclosed the parameter names. Exploitation requires high privileges and a victim to view the stored data, exposing that user's application-context data and actions.

The record

CVE
CVE-2021-21543
Published
Apr 30, 2021
Updated
Sep 16, 2024
Vendor
Dell Technologies
Product
Integrated Dell Remote Access Controller (iDRAC)
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 30, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <4.40.00.00

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Dell Technologies · Integrated Dell Remote Access Controller (iDRAC)version=unspecified <4.40.00.00

Published CVSS scores

4.8Dell TechnologiesCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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