VulnerabilityAnalyzed
CVE-2021-1879
Apple iOS, iPadOS, and watchOS WebKit Cross-Site Scripting (XSS) Vulnerability
KEVMEDIUM 6.1EPSS 7.08%
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 17 November 2021). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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..
- CVSS 3.1
- 6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 7.08% probability · 94th percentile
- CISA KEV
- Listed 3 November 2021 · due 17 November 2021
- Weakness
- CWE-79
- Affected
- apple/ipados · apple/iphone os · apple/watchos
- Source
- product-security@apple.com
CISA notes
Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2021-1879
References
- https://support.apple.com/en-us/HT212256Release Notes, Vendor Advisory
- https://support.apple.com/en-us/HT212257Release Notes, Vendor Advisory
- https://support.apple.com/en-us/HT212258Release Notes, Vendor Advisory
- https://support.apple.com/en-us/HT212256Release Notes, Vendor Advisory
- https://support.apple.com/en-us/HT212257Release Notes, Vendor Advisory
- https://support.apple.com/en-us/HT212258Release Notes, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1879US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.