Actively exploited · Published Jun 9, 2020 · Assigned by apple

CVE-2020-9818

High 8.8 Exploited

In plain English

A high-severity out-of-bounds write in iOS from Apple. Attackers are actively exploiting it in the wild (listed by CISA on November 3, 2021). The chance it is exploited in the next 30 days is estimated at 2.3% (higher than 84% of all known vulnerabilities). Apply updates per vendor instructions.

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)2.3%top 16.3% of all CVEs

Exploited in the wildYesCISA KEV since Nov 3, 2021

Attack toolingNoneno public tooling known

CISA guidance

Apply updates per vendor instructions.

Federal agencies must remediate by May 3, 2022.

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
Apple	iOS	unspecified – before iOS 13.5 and iPadOS 13.5
Apple	iOS-1	unspecified – before iOS 12.4.7
Apple	watchOS	unspecified – before watchOS 6.2.5

Weakness: CWE-787 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

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