CVE-2020-9818
Apple iOS, iPadOS, and watchOS Out-of-Bounds Write Vulnerability
Published Jun 9, 2020 · updated Jun 16, 2026 · apple ipados
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.
Timeline
Detection, updates, and resolution for this record.
Jun 9, 2020 · Catalog
Detected
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.
Nov 3, 2021 · CISA KEV
Known exploited
Apply updates per vendor instructions.
May 3, 2022 · CISA KEV
Remediation due
Apply updates per vendor instructions.
Jun 16, 2026 · Catalog
Updated
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.
Required action
Apply updates per vendor instructions.
CISA due date May 3, 2022
Affected
- cpe apple/ipadosversion unspecified
- cpe apple/iphone osversion unspecified
- cpe apple/watchosversion unspecified
- vendor Apple iOS, iPadOS, and watchOSversion unspecified
Sources
- CISA KEVCVE-2020-9818
Apple iOS, iPadOS, and watchOS Mail contains an out-of-bounds write vulnerability which may allow memory modification or application termination when processing a maliciously crafted mail message.
cisa.gov - CVE.orgCVE-2020-9818
Official CVE identifier
cve.org - FIRST EPSSCVE-2020-9818
30-day exploitation probability 2.3%
first.org - NIST NVDCVE-2020-9818
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.
nvd.nist.gov