CVE DATABASE / CVE-2020-9819
CVE-2020-9819
Apple iOS, iPadOS, and watchOS Memory Corruption Vulnerability
CVSS 4.3 · MEDIUM
⚠ CISA KEV — ACTIVELY EXPLOITED
On the CISA KEV catalog
Confirmed exploited in the wild. Added 2021-11-03.
Federal remediation due 2022-05-03.
Required action: Apply updates per vendor instructions.
Summary
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.
CVSS 3.1 breakdown
| Base score | 4.3 (MEDIUM) |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L |
| Attack vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | REQUIRED |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity | NONE |
| Availability | LOW |
Weakness type (CWE)
Affected products
Apple ipadosApple iphone osApple watchos
Check this CVE live
Use our free CVE Lookup tool for the latest NVD record, or browse the full CISA KEV catalog.
References
- https://support.apple.com/HT211168
- https://support.apple.com/HT211169
- https://support.apple.com/HT211175
- https://support.apple.com/HT211176
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-9819
Data: NIST NVD + CISA KEV. NVD last modified 2025-10-23. Always verify against the vendor advisory before acting.