What is CVE-2020-36328?

CVE-2020-36328 is a critical-severity vulnerability in Apple Ipados, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2021-05-21.

How severe is CVE-2020-36328?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2020-36328 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Apple Ipados

CVE-2020-36328

A flaw was found in libwebp in versions before 1.0.1. A heap-based buffer overflow in function WebPDecodeRGBInto is possible due to an invalid check for buffer size. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Vulnerability class: Buffer Overflow

Published 2021-05-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.027 (85.5th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 85th percentile — 85.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.027 · newest: 0.027 · change: 0.000

Affected products

Apple Ipados — versions 14.7
Apple Iphone OS — versions 14.7
NetApp Ontap Select Deploy Administration Utility
Webmproject Libwebp
Debian Linux — versions 9.0, 10.0
Red Hat Enterprise Linux — versions 7.0, 8.0
Libwebp — versions libwebp 1.0.1

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Release Notes, Issue Tracking)
lists.debian.org/debian-lts-announce/2021/06/msg00005.html (mailing-list, Mailing List, Third Party Advisory)
lists.debian.org/debian-lts-announce/2021/06/msg00006.html (mailing-list, Mailing List, Third Party Advisory)
www.debian.org/security/2021/dsa-4930 (vendor-advisory, Third Party Advisory)
support.apple.com/kb/HT212601 (Third Party Advisory)
seclists.org/fulldisclosure/2021/Jul/54 (mailing-list, Mailing List, Third Party Advisory)
security.netapp.com/advisory/ntap-20211112-0001/ (Third Party Advisory)

Frequently asked questions

What is CVE-2020-36328?: CVE-2020-36328 is a critical-severity vulnerability in Apple Ipados, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2021-05-21.
How severe is CVE-2020-36328?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2020-36328 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.