Known exploited vulnerability
CVE-2021-30661
The short answer
CVE-2021-30661 affects Apple iOS and iPadOS 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
A use after free issue was addressed with improved memory management. This issue is fixed in Safari 14.1, iOS 12.5.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5, macOS Big Sur 11.3. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..
Weakness: CWE-416.
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
4.5%
Higher than 92% 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, Safari, tvOS, watchOS, macOS. NVD's record lists the exact affected versions.
References
- support.apple.com/en-us/HT212317 Vendor Advisory
- support.apple.com/en-us/HT212318 Vendor Advisory
- support.apple.com/en-us/HT212323 Vendor Advisory
- support.apple.com/en-us/HT212324 Vendor Advisory
- support.apple.com/en-us/HT212325 Vendor Advisory
- support.apple.com/en-us/HT212341 Vendor Advisory
- support.apple.com/en-us/HT212317 Vendor Advisory
- support.apple.com/en-us/HT212318 Vendor Advisory
- support.apple.com/en-us/HT212323 Vendor Advisory
- support.apple.com/en-us/HT212324 Vendor Advisory
- support.apple.com/en-us/HT212325 Vendor Advisory
- support.apple.com/en-us/HT212341 Vendor Advisory
Questions
Is CVE-2021-30661 being exploited?
Yes. CISA added CVE-2021-30661 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-2021-30661?
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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