CVE-2021-30661
Exploited in the Wild
✓ Confirmed 0-Day
★ Google Project Zero
Triaged: March 5, 2026
12 articles
EPSS Score
Source: FIRST.org · 2026-05-24
0.11%
probability
This CVE has a 0.11% probability
of being exploited in the next 30 days.
0%
Top 29.6th percentile of all CVEs
100%
CVSS score unavailable
Neither CIRCL nor NVD returned a CVSS score for this CVE.
View on VulnerabilityLookup ↗
Description
Project ZeroUse-after-free in WebKit
Attack Intelligence
CWE-118
· Incorrect Access of Indexable Resource ('Range Error')
CWE-119
· Buffer Overflow
CWE-416
· Use After Free
CWE-664
· Improper Control of a Resource Through its Lifetime
CWE-666
· Operation on Resource in Wrong Phase of Lifetime
CWE-672
· Operation on a Resource after Expiration or Release
CWE-825
· Expired Pointer Dereference
Google Project Zero
Patched
April 26, 2021
Reported by
yangkang(@dnpushme) of 360 ATA
Root Cause Analysis
???
Apple fixes zero-day in iOS and iPadOS 15.0.2 emergency release: Detect and Prioritize Vulnerabilities using VMDR for Mobile Devices
Qualys
Oct 18, 2021
Emergency Apple iOS 15.0.2 update fixes zero-day used in attacks
BleepingComputer
Oct 11, 2021
Apple fixes iOS zero-day used to deploy NSO iPhone spyware
BleepingComputer
Sep 13, 2021
Apple fixes zero-day affecting iPhones and Macs, exploited in the wild
BleepingComputer
Jul 26, 2021
Apple patches new zero-day bug used to hack iPhones and Macs
BleepingComputer
Sep 23, 2021
Apple fixes ninth zero-day bug exploited in the wild this year
BleepingComputer
Jun 15, 2021
Apple fixes bug that breaks iPhone WiFi when joining rogue hotspots
BleepingComputer
Jul 23, 2021
Apple fixes macOS zero-day bug exploited by Shlayer malware
BleepingComputer
Apr 26, 2021
Qualys Response to CISA Alert: Binding Operational Directive 22-01
Qualys
Nov 09, 2021
Signal Intelligence
Confidence
95%
EPSS
0.11%
Mentions
12
Last Seen
Nov 09, 2021
CNA Information
Analyst Note
Auto-imported from Google Project Zero — confirmed zero-day by definition.
Triage Info
Decided atMar 05, 2026