How severe is CVE-2021-21543?

CVE-2021-21543 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-21543 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21543?

CVE-2021-21543 affects Dell Idrac9 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-21543?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-21543 published?

CVE-2021-21543 was published on 2021-04-30 and last updated on 2026-06-17.

CVE-2021-21543

CVE-2021-21543 is a medium-severity vulnerability in Dell Idrac9 Firmware with a CVSS 3.x base score of 4.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 4.8)
CVSS v2: 3.5
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Dell Idrac9 Firmware
Published: 2021-04-30
Last modified: 2026-06-17

Description

Dell EMC iDRAC9 versions prior to 4.40.00.00 contain multiple stored cross-site scripting vulnerabilities. A remote authenticated malicious user with high privileges could potentially exploit these vulnerabilities to store malicious HTML or JavaScript code through multiple affected parameters. When victim users access the submitted data through their browsers, the malicious code gets executed by the web browser in the context of the vulnerable application.

Frequently asked questions

What is CVE-2021-21543?: Dell EMC iDRAC9 versions prior to 4.40.00.00 contain multiple stored cross-site scripting vulnerabilities. A remote authenticated malicious user with high privileges could potentially exploit these vulnerabilities to store malicious HTML or JavaScript code through multiple affected parameters. When victim users access the submitted data through their browsers, the malicious code gets executed by the web browser in the context of the vulnerable application.
How severe is CVE-2021-21543?: CVE-2021-21543 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-21543 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21543?: CVE-2021-21543 affects Dell Idrac9 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-21543?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-21543 published?: CVE-2021-21543 was published on 2021-04-30 and last updated on 2026-06-17.

References

https://www.dell.com/support/kbdoc/000185293

Affected products (1)

cpe:2.3:o:dell:idrac9_firmware:*:*:*:*:*:*:*:*

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