# CVE-2020-9819: Apple iOS, iPadOS, and watchOS Memory Corruption Vulnerability

> CVE-2020-9819: Apple iOS, iPadOS, and watchOS Memory Corruption Vulnerability. CVSS 4.3 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2020-9819
Last updated: 2025-12-20T04:55:57Z

- Published: 2020-06-09 16:12 UTC · Updated: 2025-12-20 04:55 UTC · Assigner: apple
- CVSS: 4.3 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
- EPSS: 2.2%, 83th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2021-11-03, federal due date 2022-05-03, ransomware use: Unknown

## Description

A memory consumption issue was addressed with improved memory handling. This issue is fixed in iOS 13.5 and iPadOS 13.5, iOS 12.4.7, watchOS 6.2.5, watchOS 5.3.7. Processing a maliciously crafted mail message may lead to heap corruption.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Apple: iOS
- Apple: iOS-1
- Apple: watchOS
- Apple: watchOS-1

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2020-9819)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2020-9819)
- [https://support.apple.com/HT211168](https://support.apple.com/HT211168)
- [https://support.apple.com/HT211169](https://support.apple.com/HT211169)
- [https://support.apple.com/HT211175](https://support.apple.com/HT211175)
- [https://support.apple.com/HT211176](https://support.apple.com/HT211176)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2020-9819 · Markdown: https://rewindex.com/cve/CVE-2020-9819.md · JSON: https://rewindex.com/api/v1/cves/CVE-2020-9819 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T04:03:28.595Z