CVE-2021-30858
Exploited in the Wild
✓ Confirmed 0-Day
★ Google Project Zero
Triaged: March 3, 2026
8 articles
EPSS Score
Source: FIRST.org · 2026-05-24
0.79%
probability
This CVE has a 0.79% probability
of being exploited in the next 30 days.
0%
Top 74.2th 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 Indexed DB
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
Sept. 13, 2021
Reported by
???
Root Cause Analysis
https://googleprojectzero.github.io/0days-in-the-wild//0day-RCAs/2021/CVE-2021-30858.html
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
NSO Pegasus iPhone Spyware Vulnerabilities Fixed by Apple – Detect & Prioritize Using VMDR for Mobile Devices
Qualys
Sep 29, 2021
Detect & Prioritize NSO Pegasus iPhone Spyware Vulnerabilities Using VMDR for Mobile Devices
Qualys
Sep 20, 2021
Apple fixes iOS zero-day used to deploy NSO iPhone spyware
BleepingComputer
Sep 13, 2021
Security Advisory 2021-049
CERT-EU
Sep 14, 2021
Qualys Response to CISA Alert: Binding Operational Directive 22-01
Qualys
Nov 09, 2021
Signal Intelligence
Confidence
92%
EPSS
0.79%
Mentions
8
Last Seen
Nov 09, 2021
CNA Information
Analyst Note
CVE-2021-30858 is confirmed as a high-severity use-after-free vulnerability in Apple products with CVSS 8.8, actively exploited in the wild and reported by Google Project Zero. Apple's official patching across iOS, iPadOS, and macOS, combined with public exploitation evidence and CERT-EU advisory coverage, provides strong confirmation of this vulnerability's authenticity and impact.
Triage Info
Decided atMar 03, 2026