CVE-2021-30661

ENISA EUVD: EUVD-2021-17578 ↗
Exploited in the Wild ✓ Confirmed 0-Day ★ Google Project Zero
Triaged: March 5, 2026 12 articles Published: 2021-09-08
VulnLookup ↗ NVD ↗ EUVD ↗ MITRE ↗ Advisory ↗ P0 Sheet ↗ CISA KEV ↗

EPSS Score

Source: FIRST.org · 2026-05-23
0.11%
probability
This CVE has a 0.11% probability of being exploited in the next 30 days.
0% Top 29.7th percentile of all CVEs 100%

CVSS v3.1

Source: VulnerabilityLookup (CIRCL)
8.8
HIGH
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v2 (legacy)

6.8
MEDIUM
Access Vector
Network
Access Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial
AV:N/AC:M/Au:N/C:P/I:P/A:P

Description

VulnerabilityLookup (CNA)
A use after free issue was addressed with improved memory management. This issue is fixed in Safari 14.1, iOS 12.5.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5, macOS Big Sur 11.3. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..

Affected Products

Apple
iOS and iPadOS
unspecified
Apple
Safari
unspecified
Apple
tvOS
unspecified
Apple
watchOS
unspecified
Apple
macOS
unspecified

Attack Intelligence

Google Project Zero

Patched
April 26, 2021
Reported by
yangkang(@dnpushme) of 360 ATA
Root Cause Analysis
???

Signal Intelligence

Confidenceⓘ
95%
EPSS 0.11%
CVSS v3.1 8.8
Mentions 12
Last Seen Nov 09, 2021

CNA Information

CNA Assigner
apple

Analyst Note

Auto-imported from Google Project Zero — confirmed zero-day by definition.

Triage Info

Decided atMar 05, 2026
Published DateSep 08, 2021