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Known exploited vulnerability

CVE-2021-1789

highCVSS 3.1 8.8In CISA KEVEPSS 14%Published · Apple

The short answer

CVE-2021-1789 affects Apple iOS and iPadOS and is rated high (CVSS 8.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2022-05-04: attackers are using it, so patch it first.

What it is

A type confusion issue was addressed with improved state handling. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, tvOS 14.4, watchOS 7.3, iOS 14.4 and iPadOS 14.4, Safari 14.0.3. Processing maliciously crafted web content may lead to arbitrary code execution.

Weakness: CWE-843.

Severity

8.8 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploited (CISA KEV)

Yes, since May 4, 2022

Federal due date May 25, 2022

EPSS, next 30 days

14%

Higher than 97% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

What CISA says to do

Apply updates per vendor instructions.

Affected products

iOS and iPadOS, macOS. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2021-1789 being exploited?

Yes. CISA added CVE-2021-1789 to its Known Exploited Vulnerabilities catalog on 2022-05-04, with a federal remediation due date of 2022-05-25.

How do I fix CVE-2021-1789?

CISA's required action: Apply updates per vendor instructions.

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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