⚠ Actively exploited
Added to CISA KEV on 2021-11-03. Federal agencies required to patch by 2021-11-17. Required action: Apply updates per vendor instructions..

CVE-2021-1879 — Cross-site Scripting in Apple IOS

CWE-79 — Cross-site Scripting8 documents7 sources
Severity
6.1MEDIUMNVD
EPSS
0.8%
top 25.75%
CISA KEV
KEV
Added 2021-11-03
Due 2021-11-17
Exploit
Exploited in wild
Active exploitation observed
Affected products
5
Apple IOSApple IOS AND IpadosApple Watchos+2 more
Timeline
PublishedApr 2
KEV addedNov 3
KEV dueNov 17
Latest updateMay 24
CISA Required Action: Apply updates per vendor instructions.

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 vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NExploitability: 2.8 | Impact: 2.7

Affected Packages6 packages

▶NVDapple/ipados< 14.4.2
▶CVEListV5apple/watchosunspecified — 7.3
▶NVDapple/watchos< 7.3.3
▶CVEListV5apple/ios_and_ipadosunspecified — 14.4
▶CVEListV5apple/iosunspecified — 12.5

🔴Vulnerability Details

5
GHSA
GHSA-qhqp-qw35-f96r: This issue was addressed by improved management of object lifetimes↗2022-05-24
▶
Project0
The More You Know, The More You Know You Don’t Know - Project Zero↗2022-04-01
▶
CVEList
CVE-2021-1879: This issue was addressed by improved management of object lifetimes↗2021-04-02
▶
VulnCheck
Apple iOS, iPadOS, and watchOS WebKit Cross-Site Scripting (XSS) Vulnerability↗2021
▶
Project0
Project Zero RCA: CVE-2021-1879: Use-After-Free in QuickTimePluginReplacement↗
▶

📋Vendor Advisories

1
CISA
Apple iOS, iPadOS, and watchOS WebKit Cross-Site Scripting (XSS) Vulnerability↗2021-11-03
▶
CVE-2021-1879 — Cross-site Scripting in Apple IOS | cvebase