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CVE-2020-9818: Apple iOS, iPadOS, and watchOS Out-of-Bounds Write Vulnerability

criticalknown exploitedCVE-2020-9818
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: Appleproduct: iOS, iPadOS, watchOSMemory corruption
What
An out-of-bounds write vulnerability may allow memory modification or application termination when processing a malicious mail message.
Who is affected
Users of Apple iOS, iPadOS, and watchOS Mail with the vulnerable version.
Urgency
Immediate action is necessary due to active exploitation and critical severity.
Action
Update to the latest version of iOS, iPadOS, and watchOS.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2020-9818

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2020-9818coverage & exploitation statusNVD · CVE.org

Recent advisories for Apple iOS

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from CISA Known Exploited Vulnerabilities