CVE-2021-21528Network attack vector

Unauthenticated filesystem disclosure via unset redirect flag

Published Nov 12, 2021 · Updated Sep 16, 2024

Directory listing exposure in Dell PowerScale OneFS 9.1.0, 9.2.0.x, and 9.2.1.x allows remote attackers to access the filesystem. After an upgrade from an earlier release, an unset HTTP redirect flag leaves directory indexes exposed instead of redirecting requests. No authentication or user interaction is required, and the reported consequence is unauthorized filesystem read access without file modification or service interruption.

CVSS severity7.5
High
EPSS probability0.99%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Directory listing exposure in Dell PowerScale OneFS 9.1.0, 9.2.0.x, and 9.2.1.x allows remote attackers to access the filesystem. After an upgrade from an earlier release, an unset HTTP redirect flag leaves directory indexes exposed instead of redirecting requests. No authentication or user interaction is required, and the reported consequence is unauthorized filesystem read access without file modification or service interruption.

The record

CVE
CVE-2021-21528
Published
Nov 12, 2021
Updated
Sep 16, 2024
Vendor
Dell Technologies
Product
PowerScale OneFS
Classifications
CWE-548, T1005, T1083
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 12, 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

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Is a vulnerable build present?

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

  1. Affected versionversion=9.1.0, 9.2.0.x, 9.2.1.x

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Dell Technologies · PowerScale OneFSversion=9.1.0, 9.2.0.x, 9.2.1.x

Published CVSS scores

7.5Dell TechnologiesCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-548Exposure of Information Through Directory Listing
T1005Data from Local System
T1083File and Directory Discovery

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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