CVE-2021-30556
✓ Confirmed 0-Day
Triaged: March 20, 2026
1 article
EPSS Score
Source: FIRST.org · 2026-05-24
0.78%
probability
This CVE has a 0.78% probability
of being exploited in the next 30 days.
0%
Top 73.9th percentile of all CVEs
100%
CVSS score unavailable
Neither CIRCL nor NVD returned a CVSS score for this CVE.
View on VulnerabilityLookup ↗
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 fixes seventh Chrome zero-day exploited in the wild this year
BleepingComputer
Jun 17, 2021
Signal Intelligence
Confidence
85%
EPSS
0.78%
Mentions
1
Last Seen
Jun 17, 2021
CNA Information
Analyst Note
CVE-2021-30556 is explicitly named as a Chrome zero-day exploited in the wild in 2021 per BleepingComputer's headline. The article title directly confirms active exploitation before patch, meeting zero-day criteria despite minimal metadata availability.
Triage Info
Decided atMar 20, 2026