CVE-2021-30666KEV · OVERDUE

Apple iOS WebKit Buffer Overflow Vulnerability

High · published September 8, 2021

Patch now

Confirmed exploited, and the score agrees

CVSS calls it high at 8.8. It is confirmed in active exploitation. It sits in the 87.3th percentile for exploit probability.

1802
days past CISA
deadline
CVSS v3.1
8.8
EPSS
3%
Percentile
87.3
In the wild
Confirmed
What it is

🚨 A crafty piece of malicious web content can trigger a buffer overflow in older iOS versions, potentially leading to total chaos! 🔥 Think of it like a crowded concert where a stampede occurs because there's no proper crowd control. When the buffer overflows, it’s as if the venue can’t handle the influx, allowing unwanted guests to run wild! An attacker could execute arbitrary code on your device, gaining full control to read your data, install malware, or even make unauthorized changes. This could lead to devastating impacts on your privacy and security—imagine losing control over your own phone!

Put simply

Think of it like a crowded concert where a stampede occurs because there's no proper crowd control. When the buffer overflows, it’s as if the venue can’t handle the influx, allowing unwanted guests to run wild! This vulnerability stems from improper memory handling during the processing of crafted web content, which can cause a buffer overflow, allowing execution of arbitrary code.

What to do

An attacker could execute arbitrary code on your device, gaining full control to read your data, install malware, or even make unauthorized changes. This could lead to devastating impacts on your privacy and security—imagine losing control over your own phone! Immediate action is crucial! Update your iOS to version 12.5.3 or higher to patch this vulnerability. Don't forget to regularly check for system updates to keep your devices secure! You've got this! By acting swiftly, you can safeguard your device and enjoy a more secure digital experience! 🛡️

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.02998 · 87.3th percentile
Published
2021-09-08T14:25Z
KEV added
2021-11-03 · due 2021-11-17
EPSS history
Timeline
  • 03 NOV 00:00Z
    Added to CISA KEV — remediate by Nov 17
    kev
  • 08 SEP 14:25Z
    A buffer overflow issue was addressed with improved memory handling
    cvelistv5