CVE-2021-30666: Apple iOS WebKit Buffer Overflow Vulnerability
CVE-2021-30666 · Severity: critical · CVSS 8.8 · Exploited in the wild · Published 2021-11-03
Apple iOS WebKit contains a buffer overflow vulnerability due to improper memory handling when processing maliciously crafted web content. Successful exploitation allows for arbitrary code execution on the affected device. Apple has acknowledged reports that this vulnerability may have been actively exploited in the wild.
Quick answers
Is CVE-2021-30666 exploited in the wild?
Yes. CVE-2021-30666 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.
How severe is CVE-2021-30666?
Critical severity, with a CVSS score of 8.8, published 3 November 2021.
Which products and versions are affected?
Apple iOS up to (excluding) 12.5.3; Apple WebKit.
Is there a fix for CVE-2021-30666?
A patch was published on 2021-05-03: Fixed in iOS 12.5.3 (based on Apple advisory HT212341) Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2021-30666 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2021-30666?
Check whether anything you run is named in the advisory. 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 up to (excluding) 12.5.3
Apple WebKit
Timeline
2021-09-08: disclosed: NVD Published Date
2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
2021-05-03: patched: Fixed in iOS 12.5.3 (based on Apple advisory HT212341)
2021-11-03: advisory: Advisory published date provided in text
exploited: Apple is aware of reports of active exploitation.