No exploitation reported

CVE-2021-21505

No exploitation reported by the sources we read.

Published2021-05-06
WeaknessCWE-1188 · CWE-255

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Dell EMC Integrated System for Microsoft Azure Stack Hub, versions 1906 – 2011, contain an undocumented default iDRAC account. A remote unauthenticated attacker, with the knowledge of the default credentials, could potentially exploit this to log in to the system to gain root privileges.

Timeline

dates in UTC

2021-05-0613:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-21505?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-21505?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Dell emc integrated system for microsoft azure stack hub firmwareversion to verify

Branch	Affected	Fixed in	Source
2011.x	≥ 1906, ≤ 2011	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

www.dell.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CNACVSS 3.18read 2026-10-23
NVDCVSS 3.19.8read 2026-10-23
NVDCVSS 2.010read 2026-10-23
CNAweakness (CWE)CWE-255read 2026-10-23
NVDweakness (CWE)CWE-1188read 2026-10-23
FIRST EPSSEPSS score2.4 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2021-05-06
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-21505?

Is CVE-2021-21505 actively exploited?

Active exploitation of CVE-2021-21505 has not been confirmed. Its EPSS score was 2.4% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-21505?

CVE-2021-21505 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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