A use after free issue was addressed with improved memory management.
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Listed in CISA KEV
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Actively exploited
- Fix
- Fixed in 14.5, 14.1, 7.4, 11.3, 12.5
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
Apple's Safari web browser and its iPhone, iPad, Apple Watch, Apple TV, and Mac operating systems are affected. Processing specially crafted web content could allow an attacker to run arbitrary code on the device.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
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..
Timeline
- CVE published
- Added to CISA KEV
CISA has evidence of exploitation in the wild
- CISA remediation deadline
Due date for US federal agencies to patch
- Record last updated
Affected versions
- Apple iOS and iPadOS
From unspecified · fixed in 14.5
- Apple Safari
From unspecified · fixed in 14.1
- Apple tvOS
From unspecified · fixed in 14.5
- Apple watchOS
From unspecified · fixed in 7.4
- Apple macOS
From unspecified · fixed in 11.3
- Apple macOS
From unspecified · fixed in 12.5
References 6
Questions about CVE-2021-30661
What does this mean?
A use-after-free bug is a memory error where software keeps using a memory block after it has been released. Per Apple's advisory, processing maliciously crafted web content may lead to arbitrary code execution. Apple fixed it with improved memory management.Source: support.apple.com
Am I affected, and how do I check?
Apple's facts list iOS and iPadOS before 14.5, Safari before 14.1, tvOS before 14.5, watchOS before 7.4, and macOS before 11.3 and macOS before 12.5. To check, look at the version under Settings > General > About on iPhone or iPad, or run sw_vers on a Mac. Safari's version is shown in its About window.Source: support.apple.com
What should I do about it?
Update to iOS and iPadOS 14.5, Safari 14.1, tvOS 14.5, watchOS 7.4, or macOS 11.3 or 12.5, depending on your product line. Apple's advisory names tvOS 14.5 as a fixed version.Source: support.apple.com
Is it being exploited?
Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2021-11-03, which means it has evidence of attacks. No public exploit code is tracked.Source: cisa.gov, cve.now feed data