# CVE-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.

- Page: https://www.vulneraibility.com/cve/CVE-2020-9818
- CVSS: 8.8
- Known exploited: yes, in CISA KEV since 2021-11-03; CISA due date 2022-05-03
- EPSS: 2.34% (percentile 83.9)
- CISA SSVC: exploitation active, automatable no, technical impact total (assessed 2025-08-19)
- Weakness: CWE-787
- Published: 2020-06-09

## Affected versions

- Apple iOS: affected < iOS 13.5 and iPadOS 13.5
- Apple iOS-1: affected < iOS 12.4.7
- Apple watchOS: affected < watchOS 6.2.5

A version outside these ranges is not a statement that it is unaffected.

## References

- [other] https://support.apple.com/HT211168
- [other] https://support.apple.com/HT211175
- [other] https://support.apple.com/HT211169
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-9818

---
Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.