What is CVE-2021-20834?

CVE-2021-20834 is a medium-severity vulnerability in Nike, classified under Missing Authorization. CVSS score: 6.1/10. Published 2021-10-13.

How severe is CVE-2021-20834?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Auth bypass in Nike

CVE-2021-20834

Improper authorization in handler for custom URL scheme vulnerability in Nike App for Android versions prior to 2.177 and Nike App for iOS versions prior to 2.177.1 allows a remote attacker to lead a user to access an arbitrary website via the vulnerable App.

Vulnerability class: Broken Access Control

Published 2021-10-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.012 (66.9th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 66.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Nike
Nike, Inc. Nike App For Android Versions Prior To 2.177 And iOS 2.177.1 — versions Nike App for Android versions prior to 2.177 and Nike App for iOS versions prior to 2.177.1

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

play.google.com/store/apps/details (Product)
apps.apple.com/app/nike/id1095459556 (Product, Release Notes)
jvn.jp/en/jp/JVN89126639/index.html (Third Party Advisory)

Frequently asked questions

What is CVE-2021-20834?: CVE-2021-20834 is a medium-severity vulnerability in Nike, classified under Missing Authorization. CVSS score: 6.1/10. Published 2021-10-13.
How severe is CVE-2021-20834?: Medium severity. CVSS v3 base score is 6.1 out of 10.