CVE-2021-30633
Exploited in the Wild
✓ Confirmed 0-Day
★ Google Project Zero
Triaged: March 5, 2026
10 articles
EPSS Score
Source: FIRST.org · 2026-05-24
33.07%
probability
This CVE has a 33.07% probability
of being exploited in the next 30 days.
0%
Top 97.0th 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
Discovered
Sept. 8, 2021
Patched
Sept. 13, 2021
Reported by
???
Root Cause Analysis
???
Google pushes emergency Chrome update to fix zero-day used in attacks
BleepingComputer
Dec 13, 2021
Emergency Google Chrome update fixes zero-days used in attacks
BleepingComputer
Oct 28, 2021
Google pushes emergency Chrome update to fix two zero-days
BleepingComputer
Sep 30, 2021
Google Chrome emergency update fixes zero-day exploited in attacks
BleepingComputer
Feb 14, 2022
Emergency Google Chrome update fixes zero-day exploited in the wild
BleepingComputer
Sep 24, 2021
Google patches 10th Chrome zero-day exploited in the wild this year
BleepingComputer
Sep 13, 2021
Qualys Response to CISA Alert: Binding Operational Directive 22-01
Qualys
Nov 09, 2021
Signal Intelligence
Confidence
95%
EPSS
33.07%
Mentions
10
Last Seen
Feb 14, 2022
CNA Information
Analyst Note
Auto-imported from Google Project Zero — confirmed zero-day by definition.
Triage Info
Decided atMar 05, 2026