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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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 11.6, 14.8
- 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 iOS, iPadOS, and macOS operating systems are affected. A specially crafted web page 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 iOS 14.8 and iPadOS 14.8, macOS Big Sur 11.6. 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
- EPSS reached 10%
FIRST estimates at least a 10% chance of exploitation in the next 30 days
Affected versions
- Apple macOS
From unspecified · fixed in 11.6
- Apple iOS
From unspecified · fixed in 14.8
References 18
support.apple.com
seclists.org
openwall.com
lists.fedoraproject.org
Questions about CVE-2021-30858
What does this mean?
A use-after-free bug is a memory error where the software keeps using a memory area after it has been released. The facts say the issue was addressed with improved memory management. The stated impact is arbitrary code execution when the browser engine processes maliciously crafted web content.Source: lists.debian.org
Am I affected, and how do I check?
The facts list macOS with an unspecified starting version, fixed in 11.6, and iOS with an unspecified starting version, fixed in 14.8. To check a Mac, compare the version shown under About This Mac with 11.6; on an iPhone or iPad, check Settings, General, About against 14.8.Source: lists.debian.org
What should I do about it?
Update macOS to 11.6 or later and iOS to 14.8 or later. The facts give no workaround, so installing the fixed release is the stated remedy.Source: lists.debian.org
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