What is CVE-2021-1807?

CVE-2021-1807 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Improper Input Validation. CVSS score: 5.5/10. Published 2021-09-08.

How severe is CVE-2021-1807?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Improper input validation in Apple iOS And Ipados

CVE-2021-1807

A validation issue was addressed with improved input sanitization. This issue is fixed in iOS 14.5 and iPadOS 14.5, watchOS 7.4. A local user may be able to write arbitrary files.

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

Published 2021-09-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.003 (22.8th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 22.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Apple iOS And Ipados — versions unspecified
Apple Ipados
Apple Iphone OS
Apple watchOS — versions unspecified

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

support.apple.com/en-us/HT212317 (Vendor Advisory)
support.apple.com/en-us/HT212324 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-1807?: CVE-2021-1807 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Improper Input Validation. CVSS score: 5.5/10. Published 2021-09-08.
How severe is CVE-2021-1807?: Medium severity. CVSS v3 base score is 5.5 out of 10.