CVE-2021-21191
✓ Confirmed 0-Day
Triaged: March 20, 2026
1 article
EPSS Score
Source: FIRST.org · 2026-05-24
0.99%
probability
This CVE has a 0.99% probability
of being exploited in the next 30 days.
0%
Top 77.1th 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 second actively exploited Chrome zero-day this month
BleepingComputer
Mar 12, 2021
Signal Intelligence
Confidence
85%
EPSS
0.99%
Mentions
1
Last Seen
Mar 12, 2021
CNA Information
Analyst Note
CVE-2021-21191 is explicitly named as an actively exploited Chrome zero-day patched by Google in 2021. The source (BleepingComputer) directly identifies it as a zero-day with active exploitation, meeting the core criteria of in-the-wild exploitation and vendor patching.
Triage Info
Decided atMar 20, 2026