CVE-2021-21172
✓ Confirmed 0-Day
Triaged: March 20, 2026
2 articles
EPSS Score
Source: FIRST.org · 2026-05-24
0.57%
probability
This CVE has a 0.57% probability
of being exploited in the next 30 days.
0%
Top 68.8th percentile of all CVEs
100%
CVSS score unavailable
Neither CIRCL nor NVD returned a CVSS score for this CVE.
View on VulnerabilityLookup ↗
Google fixes second actively exploited Chrome zero-day bug this year
BleepingComputer
Mar 02, 2021
Microsoft March 2021 Patch Tuesday fixes 82 flaws, 2 zero-days
BleepingComputer
Mar 09, 2021
Signal Intelligence
Confidence
85%
EPSS
0.57%
Mentions
2
Last Seen
Mar 09, 2021
CNA Information
Analyst Note
Article [1] explicitly names this CVE as an 'actively exploited Chrome zero-day bug' fixed by Google in 2021, establishing both in-the-wild exploitation and vendor patching. The CVE year (2021) and article timing are consistent with zero-day disclosure patterns.
Triage Info
Decided atMar 20, 2026