Is CVE-2020-9818 actively exploited?

CVE-2020-9818 has no public evidence of in-the-wild exploitation as of 2025-10-23.

What is the CVSS score for CVE-2020-9818?

CVE-2020-9818 has a CVSS score of 8.8 (HIGH severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

How do I patch CVE-2020-9818?

Patch guidance is available from apple security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2020-9818.

Fix CVE-2020-9818 - HIGH apple ipados

Q: Which products are affected by CVE-2020-9818?

4 products: apple ipados, apple iphone os, apple iphone os, apple watchos.

Description

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 13.5 and iPadOS 13.5, iOS 12.4.7, watchOS 6.2.5. Processing a maliciously crafted mail message may lead to unexpected memory modification or application termination.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: required
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-787 · Out-of-bounds Write CWE-787 · Out-of-bounds Write

Metadata

Primary Vendor: APPLE
Published: 6/9/2020
Last Modified: 10/23/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2020-9818

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary