What is CVE-2020-9903?

CVE-2020-9903 is a high-severity vulnerability in Apple iOS, classified under Origin Validation Error. CVSS score: 7.5/10. Published 2020-10-16.

How severe is CVE-2020-9903?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Apple iOS

CVE-2020-9903

A logic issue was addressed with improved restrictions. This issue is fixed in iOS 13.6 and iPadOS 13.6, Safari 13.1.2. A malicious attacker may cause Safari to suggest a password for the wrong domain.

Published 2020-10-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.005 (41.0th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Apple iOS — versions unspecified
Apple Ipados
Apple Iphone OS
Apple Safari — versions unspecified

Weakness classification (CWE)

CWE-346 — Origin Validation Error

References

support.apple.com/HT211288 (Vendor Advisory)
support.apple.com/HT211292 (Vendor Advisory)

Frequently asked questions

What is CVE-2020-9903?: CVE-2020-9903 is a high-severity vulnerability in Apple iOS, classified under Origin Validation Error. CVSS score: 7.5/10. Published 2020-10-16.
How severe is CVE-2020-9903?: High severity. CVSS v3 base score is 7.5 out of 10.