What is CVE-2021-21506?

CVE-2021-21506 is a high-severity vulnerability in Dell EMC Powerscale Onefs, classified under Improper Input Validation. CVSS score: 8.8/10. Published 2021-03-08.

How severe is CVE-2021-21506?

High severity. CVSS v3 base score is 8.8 out of 10.

Improper input validation in Dell EMC Powerscale Onefs

CVE-2021-21506

PowerScale OneFS 8.1.2,8.2.2 and 9.1.0 contains an improper input sanitization issue in its API handler. An un-authtenticated with ISI_PRIV_SYS_SUPPORT and ISI_PRIV_LOGIN_PAPI privileges could potentially exploit this vulnerability, leading to potential privileges escalation.

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

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

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.011 (64.4th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.4% 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: 0.011 · change: +0.000

Affected products

Dell EMC Powerscale Onefs — versions 8.1.2, 8.2.2, 9.1.0
Dell Powerscale Onefs — versions unspecified

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

www.dell.com/support/kbdoc/000183717 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-21506?: CVE-2021-21506 is a high-severity vulnerability in Dell EMC Powerscale Onefs, classified under Improper Input Validation. CVSS score: 8.8/10. Published 2021-03-08.
How severe is CVE-2021-21506?: High severity. CVSS v3 base score is 8.8 out of 10.