What is CVE-2021-21511?

CVE-2021-21511 is a high-severity vulnerability in Dell Avamar, classified under Improper Authorization. CVSS score: 8.1/10. Published 2021-02-15.

How severe is CVE-2021-21511?

High severity. CVSS v3 base score is 8.1 out of 10.

Auth bypass in Dell Avamar

CVE-2021-21511

Dell EMC Avamar Server, versions 19.3 and 19.4 contain an Improper Authorization vulnerability in the web UI. A remote low privileged attacker could potentially exploit this vulnerability, to gain unauthorized read or modification access to other users' backup data.

Published 2021-02-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.010 (63.5th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 63.5% 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: 0.010 · change: 0.000

Affected products

Dell Avamar — versions 19.3, 19.4
Dell EMC Avamar Server — versions 19.3, 19.4
Dell EMC Integrated Data Protection Appliance — versions 2.6

Weakness classification (CWE)

CWE-285 — Improper Authorization

References

www.dell.com/support/kbdoc/en-us/000182926/dsa-2021-033-dell-emc-avamar-server-… (Vendor Advisory)

Frequently asked questions

What is CVE-2021-21511?: CVE-2021-21511 is a high-severity vulnerability in Dell Avamar, classified under Improper Authorization. CVSS score: 8.1/10. Published 2021-02-15.
How severe is CVE-2021-21511?: High severity. CVSS v3 base score is 8.1 out of 10.