What is CVE-2021-43188?

CVE-2021-43188 is a high-severity vulnerability in Apple Iphone OS. CVSS score: 7.3/10. Published 2021-11-09.

How severe is CVE-2021-43188?

High severity. CVSS v3 base score is 7.3 out of 10.

Vulnerability in Apple Iphone OS

CVE-2021-43188

In JetBrains YouTrack Mobile before 2021.2, access token protection on iOS is incomplete.

Published 2021-11-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.008 (53.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 53.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.008 · change: +0.000

Affected products

References

blog.jetbrains.com/blog/2021/11/08/jetbrains-security-bulletin-q3-2021/ (Vendor Advisory)

Frequently asked questions

What is CVE-2021-43188?: CVE-2021-43188 is a high-severity vulnerability in Apple Iphone OS. CVSS score: 7.3/10. Published 2021-11-09.
How severe is CVE-2021-43188?: High severity. CVSS v3 base score is 7.3 out of 10.