CVE-2021-1879: Apple iOS, iPadOS, and watchOS WebKit Cross-Site Scripting (XSS) Vulnerability

CVE-2021-1879 · Severity: critical · CVSS 6.1 · Exploited in the wild · Published 2021-11-03

Apple WebKit contains a universal cross-site scripting (XSS) vulnerability due to improper management of object lifetimes. Processing maliciously crafted web content can allow an attacker to execute scripts across different domains, impacting various HTML parsers and browsers that rely on WebKit.

Technologies: Apple iPadOS, Apple watchOS. Vendors: Apple.

Quick answers

Is CVE-2021-1879 exploited in the wild?
Yes. CVE-2021-1879 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.
How severe is CVE-2021-1879?
Critical severity, with a CVSS score of 6.1, published 3 November 2021.
Which products and versions are affected?
Apple iOS Before 12.5.2, 13.0 to 14.4.2; Apple iPadOS Before 14.4.2; Apple watchOS Before 7.3.3; Apple WebKit.
Is there a fix for CVE-2021-1879?
A patch was published on 2021-04-09: Initial NIST analysis and patch information recorded Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2021-1879 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2021-1879?
Check whether you run Apple iPadOS or Apple watchOS. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Apple iOS Before 12.5.2, 13.0 to 14.4.2
  • Apple iPadOS Before 14.4.2
  • Apple watchOS Before 7.3.3
  • Apple WebKit

Timeline

  • 2021-04-02: disclosed: NVD Published Date
  • 2021-04-09: patched: Initial NIST analysis and patch information recorded
  • 2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
  • 2021-11-03: exploited: Apple is aware of reports that this issue may have been actively exploited.

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