A memory corruption issue was addressed with improved memory handling.
Affects macOS Big Sur, fixed in macOS Big Sur 11.5.1 according to the advisory's fix section. No vendor severity rating is given.
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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 11.5, 14.7, 7.6
- 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
This vulnerability affects Apple's macOS, iOS, iPadOS, and watchOS operating systems. A flaw in memory handling could allow a malicious application to run arbitrary code with kernel-level privileges, giving it control over the entire device.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
A memory corruption issue was addressed with improved memory handling. This issue is fixed in macOS Big Sur 11.5.1, iOS 14.7.1 and iPadOS 14.7.1, watchOS 7.6.1. An application may be able to execute arbitrary code with kernel privileges. 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 11.5
- Apple macOS
From unspecified · fixed in 14.7
- Apple macOS
From unspecified · fixed in 7.6
References 3
support.apple.com
Questions about CVE-2021-30807
What does this mean?
The advisory says a memory corruption issue was addressed with improved memory handling. It states that an application may be able to execute arbitrary code with kernel privileges.Source: support.apple.com
Am I affected, and how do I check?
The advisory lists macOS Big Sur as affected, and its fix is in macOS Big Sur 11.5.1. To check a Mac, open About This Mac and compare the macOS version shown there with 11.5.1.Source: support.apple.com
What should I do about it?
Update to macOS Big Sur 11.5.1, the release the advisory describes as containing the fix.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