CVE-2021-30761KEV · OVERDUE

Apple iOS WebKit Memory Corruption 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 95.8th percentile for exploit probability.

1803
days past CISA
deadline
CVSS v3.1
8.8
EPSS
11%
Percentile
95.8
In the wild
Confirmed
What it is

🚨 A crafty memory corruption issue could let attackers run code on your iPhone! ⚡ This vulnerability, CVE-2021-30761, has been actively exploited, which makes it super urgent to address! Think of it like a restaurant that forgot to check the IDs of all its patrons. If someone slips in with a fake ID, they can order anything from the kitchen without raising suspicion—potentially ruining the dining experience for everyone! This vulnerability allows an attacker to exploit a flaw in memory management, leading to arbitrary code execution. It's absolutely devastating: an attacker could take control of your device, steal sensitive information, or run malicious applications without your consent. Yikes!

Put simply

Think of it like a restaurant that forgot to check the IDs of all its patrons. If someone slips in with a fake ID, they can order anything from the kitchen without raising suspicion—potentially ruining the dining experience for everyone! This memory corruption issue arises from improper state management when processing maliciously crafted web content, allowing unauthorized code execution. Apple has provided a fix in iOS version 12.5.4, but older systems remain vulnerable.

What to do

This vulnerability allows an attacker to exploit a flaw in memory management, leading to arbitrary code execution. It's absolutely devastating: an attacker could take control of your device, steal sensitive information, or run malicious applications without your consent. Yikes! To protect yourself, update your device to iOS 12.5.4 immediately. Regularly check for updates, and encourage others to do the same! Staying current is key to keeping your data safe! You've got this! By following these steps, you can defend your device like the security hero you are! 🛡️

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
0.10545 · 95.8th percentile
Published
2021-09-08T13:45Z
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 13:45Z
    A memory corruption issue was addressed with improved state management
    cvelistv5