A buffer overflow issue was addressed with improved memory handling.
Affects iOS 12.5.3 and earlier on iPhone 5s, iPhone 6, iPhone 6 Plus, iPad Air, iPad mini 2, iPad mini 3, and iPod touch (6th generation). Fixed in iOS 12.5.3.
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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 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 iOS mobile operating system is affected. Processing maliciously 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 buffer overflow issue was addressed with improved memory handling. This issue is fixed in iOS 12.5.3. 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
From unspecified · fixed in 12.5
References 1
support.apple.com
Questions about CVE-2021-30666
What does this mean?
A buffer overflow in WebKit, the web content engine in iOS, can be triggered by maliciously crafted web content. The advisory says this may lead to arbitrary code execution.Source: support.apple.com
Am I affected, and how do I check?
Devices running iOS 12.5.3 or earlier on the listed models: iPhone 5s, iPhone 6, iPhone 6 Plus, iPad Air, iPad mini 2, iPad mini 3, and iPod touch (6th generation). To check, compare the device model and the iOS version it runs against this list.Source: support.apple.com
What should I do about it?
Update to iOS 12.5.3, which was released May 3, 2021.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