CVE-2020-9818
Apple Inc. · published 2020-06-09
Source record Collected from the National Vulnerability Database (NVD)
CISA Known Exploited Vulnerabilities
CISA lists this CVE as known exploited (added 2021-11-03).
- CISA's name for it: Apple iOS, iPadOS, and watchOS Out-of-Bounds Write Vulnerability
- CISA's description: 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.
- Known ransomware campaign use, per CISA: Unknown
Source: CISA KEV catalog (CC0 1.0).
Description
Description by Apple Inc. via the CVE Program.
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.
Status at the source
- NVD status: Analyzed
Affected products, as the source lists them
| Vendor | Product | Versions |
|---|---|---|
| Apple | iOS | unspecified – before iOS 13.5 and iPadOS 13.5: affected |
| Apple | iOS-1 | unspecified – before iOS 12.4.7: affected |
| Apple | watchOS | unspecified – before watchOS 6.2.5: affected |
Products named in NVD's CPE match criteria (3)
cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*
DeSpy has not checked any unit, hardware revision or firmware. A product missing here is not a statement that it is unaffected.
Scores, as their sources published them
- CVSS 3.1: 8.8 HIGH — as published by NIST (Primary)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - CVSS 3.1: 8.8 HIGH — as published by CISA-ADP (Secondary)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - CVSS 2.0: 6.8 MEDIUM — as published by NIST (Primary)
AV:N/AC:M/Au:N/C:P/I:P/A:P - SSVC — CISA's assessment (SSVC 2.0.3, CISA Coordinator): Exploitation: active · Automatable: no · Technical impact: total
DeSpy does not score records. These are the sources' own values.
Weaknesses
Sources
References the source lists
- https://support.apple.com/HT211168
- https://support.apple.com/HT211169
- https://support.apple.com/HT211175
- https://support.apple.com/HT211168
- https://support.apple.com/HT211169
- https://support.apple.com/HT211175
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-9818
Source dates: published 2020-06-09, last changed 2026-06-17. DeSpy's copy of this version is dated 2026-09-28.
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