What is CVE-2020-29639?

CVE-2020-29639 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2021-04-02.

How severe is CVE-2020-29639?

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

Out-of-bounds Read in Apple iOS And Ipados

CVE-2020-29639

An out-of-bounds read was addressed with improved input validation. This issue is fixed in iOS 14.0 and iPadOS 14.0. Processing a maliciously crafted font may result in the disclosure of process memory.

Vulnerability class: Buffer Overflow

Published 2021-04-02 · last modified 2026-06-17.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.007 (49.6th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.6% 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: 0.007 · change: 0.000

Affected products

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

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

support.apple.com/en-us/HT211850 (Vendor Advisory)

Frequently asked questions

What is CVE-2020-29639?: CVE-2020-29639 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2021-04-02.
How severe is CVE-2020-29639?: Medium severity. CVSS v3 base score is 5.5 out of 10.