HOMEVULNERABILITIESCVE-2021-21505
CRITICAL

CVE-2021-21505

CWE-255Published: May 6, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-21505 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Dell2 product(s)
emc integrated system for microsoft azure stack hub firmwareemc integrated system for microsoft azure stack hub
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

ADVISORYhttps://www.dell.com/support/kbdoc/en-us/000186008/dsa-2021-020-dell-emc-integrated-system-for-microsoft-azure-stack-hub-security-update-for-an-idrac-undocumented-account-vulnerability
ADVISORYhttps://www.dell.com/support/kbdoc/en-us/000186008/dsa-2021-020-dell-emc-integrated-system-for-microsoft-azure-stack-hub-security-update-for-an-idrac-undocumented-account-vulnerability

All References (2)

→
https://www.dell.com/support/kbdoc/en-us/000186008/dsa-2021-020-dell-emc-integrated-system-for-microsoft-azure-stack-hub-security-update-for-an-idrac-undocumented-account-vulnerabilityVendor Advisory
→
https://www.dell.com/support/kbdoc/en-us/000186008/dsa-2021-020-dell-emc-integrated-system-for-microsoft-azure-stack-hub-security-update-for-an-idrac-undocumented-account-vulnerabilityVendor Advisory

Quick Facts

CVE IDCVE-2021-21505
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-255
CISA KEVNo
Affected1 vendor(s)
PublishedMay 6, 2021

Related CVEs (CWE-255)

CVE-2009-4188
10.0
CVE-2011-4757
10.0
CVE-2016-0898
10.0
CVE-2009-4189
10.0
CVE-2010-0570
10.0
CVE-2007-0057
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-21505 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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