Known exploited vulnerability
CVE-2021-30663
The short answer
CVE-2021-30663 affects Apple macOS and is rated high (CVSS 8.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2021-11-03: attackers are using it, so patch it first.
What it is
An integer overflow was addressed with improved input validation. This issue is fixed in iOS 14.5.1 and iPadOS 14.5.1, tvOS 14.6, iOS 12.5.3, Safari 14.1.1, macOS Big Sur 11.3.1. Processing maliciously crafted web content may lead to arbitrary code execution.
Weakness: CWE-190.
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 Nov 3, 2021
Federal due date Nov 17, 2021
EPSS, next 30 days
3.5%
Higher than 89% 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
macOS. NVD's record lists the exact affected versions.
References
- support.apple.com/en-us/HT212335 Release NotesVendor Advisory
- support.apple.com/en-us/HT212336 Release NotesVendor Advisory
- support.apple.com/en-us/HT212341 Release NotesVendor Advisory
- support.apple.com/en-us/HT212532 Release NotesVendor Advisory
- support.apple.com/en-us/HT212534 Release NotesVendor Advisory
- support.apple.com/en-us/HT212335 Release NotesVendor Advisory
- support.apple.com/en-us/HT212336 Release NotesVendor Advisory
- support.apple.com/en-us/HT212341 Release NotesVendor Advisory
- support.apple.com/en-us/HT212532 Release NotesVendor Advisory
- support.apple.com/en-us/HT212534 Release NotesVendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30663 Third Party AdvisoryUS Government Resource
Questions
Is CVE-2021-30663 being exploited?
Yes. CISA added CVE-2021-30663 to its Known Exploited Vulnerabilities catalog on 2021-11-03, with a federal remediation due date of 2021-11-17.
How do I fix CVE-2021-30663?
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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