What is CVE-2021-21510?

CVE-2021-21510 is a medium-severity vulnerability in Dell Idrac8 Firmware, classified under Improper Input Validation. CVSS score: 6.1/10. Published 2021-03-08.

How severe is CVE-2021-21510?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2021-21510 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Improper input validation in Dell Idrac8 Firmware

CVE-2021-21510

Dell iDRAC8 versions prior to 2.75.100.75 contain a host header injection vulnerability. A remote unauthenticated attacker may potentially exploit this vulnerability by injecting arbitrary ‘Host’ header values to poison a web-cache or trigger redirections.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2021-03-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.010 (63.3th percentile), scored 2026-10-25.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 63.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Dell Idrac8 Firmware
Dell Integrated Remote Access Controller (Idrac) — versions unspecified

Weakness classification (CWE)

Public proof-of-concept exploits

References

www.dell.com/support/kbdoc/en-us/000183758/dsa-2021-041-dell-emc-idrac-8-securi… (Vendor Advisory)

Frequently asked questions

What is CVE-2021-21510?: CVE-2021-21510 is a medium-severity vulnerability in Dell Idrac8 Firmware, classified under Improper Input Validation. CVSS score: 6.1/10. Published 2021-03-08.
How severe is CVE-2021-21510?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2021-21510 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.