This issue was addressed by improved management of object lifetimes.
Affects Apple iOS and iPadOS before 14.4, iOS before 12.5, and watchOS before 7.3. Apple's advisory lists the fix in iOS 14.4.2 and iPadOS 14.4.2. Apple gives no vendor severity rating, so only the CVSS score of 6.1 (medium) applies.
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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 14.4, 12.5, 7.3
- 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 watchOS are affected. Maliciously crafted web content processed by these systems could allow universal cross-site scripting, letting an attacker run scripts within other websites.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
This issue was addressed by improved management of object lifetimes. This issue is fixed in iOS 12.5.2, iOS 14.4.2 and iPadOS 14.4.2, watchOS 7.3.3. Processing maliciously crafted web content may lead to universal cross site scripting. 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 14.4
- Apple iOS
From unspecified · fixed in 12.5
- Apple watchOS
From unspecified · fixed in 7.3
References 3
support.apple.com
Questions about CVE-2021-1879
What does this mean?
Processing maliciously crafted web content can lead to universal cross-site scripting, which lets an attacker run scripts in a victim's browsing context. Apple fixed it by improving how the software manages object lifetimes.Source: support.apple.com
Am I affected, and how do I check?
The affected ranges are iOS and iPadOS before 14.4, iOS before 12.5, and watchOS before 7.3. To check a device, open Settings, go to General, then About, and compare the listed software version with these ranges.Source: support.apple.com
What should I do about it?
Update to iOS 14.4.2 or iPadOS 14.4.2, the fixed versions named in Apple's advisory. The checked facts name no fixed version for iOS 12.5 or watchOS 7.3 beyond the listed range boundaries.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