CVE-2021-30657KEV · OVERDUE

Apple macOS Unspecified Vulnerability

Medium · published September 8, 2021

Patch now

The score understates this — it's already being exploited

CVSS calls it medium at 5.5. It is confirmed in active exploitation. It sits in the 99.3th percentile for exploit probability.

1803
days past CISA
deadline
CVSS v3.1
5.5
EPSS
69%
Percentile
99.3
In the wild
Confirmed
What it is

⚠️ A crafty application can sneak past Gatekeeper checks due to a logic issue in macOS! 🚀 Think of Gatekeeper as a bouncer checking IDs at a club. If the bouncer doesn't spot a fake ID due to a mistake in the guest list, anyone could waltz in, causing chaos inside! An attacker could install malicious software without any checks, potentially leading to data theft or unauthorized access to your system. This vulnerability could be your digital front door left wide open, inviting trouble right into your home!

Put simply

Think of Gatekeeper as a bouncer checking IDs at a club. If the bouncer doesn't spot a fake ID due to a mistake in the guest list, anyone could waltz in, causing chaos inside! This vulnerability arises from a logic issue in state management, allowing malicious applications to bypass Gatekeeper's security measures when checking app signatures.

What to do

An attacker could install malicious software without any checks, potentially leading to data theft or unauthorized access to your system. This vulnerability could be your digital front door left wide open, inviting trouble right into your home! Update to macOS Big Sur 11.3 or Security Update 2021-002 for Catalina immediately to close this security gap. Run regular security checks and ensure your Gatekeeper settings are appropriately configured for added caution. You’ve got this! Follow these steps and you’ll keep your Mac safe and sound! 🛡️

The record
Technical detail
CVSS v3.1
5.5 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.68531 · 99.3th percentile
Published
2021-09-08T14:49Z
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 14:49Z
    A logic issue was addressed with improved state management
    cvelistv5