CVE-2021-21506Network attack vector

Authenticated privilege escalation via API validation misuse

Published Mar 8, 2021 · Updated Sep 16, 2024

Improper validation in Dell PowerScale OneFS 8.1.2, 8.2.2, and 9.1.0 API allows remote authenticated users to escalate privileges. The proprietary API misuses its validation framework when processing input, but Dell has not disclosed the affected endpoint, input, or faulty operation. Exploitation requires an account holding both ISI_PRIV_LOGIN_PAPI and ISI_PRIV_SYS_SUPPORT; Dell reports privilege escalation but no more specific post-escalation capability.

CVSS severity8.8
High
EPSS probability1.04%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper validation in Dell PowerScale OneFS 8.1.2, 8.2.2, and 9.1.0 API allows remote authenticated users to escalate privileges. The proprietary API misuses its validation framework when processing input, but Dell has not disclosed the affected endpoint, input, or faulty operation. Exploitation requires an account holding both ISI_PRIV_LOGIN_PAPI and ISI_PRIV_SYS_SUPPORT; Dell reports privilege escalation but no more specific post-escalation capability.

The record

CVE
CVE-2021-21506
Published
Mar 8, 2021
Updated
Sep 16, 2024
Vendor
Dell Technologies
Product
PowerScale OneFS
Classifications
CWE-20, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 8, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=unspecified <8.1.2, 8.2.2,9.1.0.x,EMPIRE (9.2.0), GOTHAM

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Dell Technologies · PowerScale OneFSversion=unspecified <8.1.2, 8.2.2,9.1.0.x,EMPIRE (9.2.0), GOTHAM

Published CVSS scores

8.8DellCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P

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 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1068Exploitation for Privilege Escalation

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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