CVE-2021-21169

✓ Confirmed 0-Day

Triaged: March 20, 2026 2 articles

VulnLookup ↗ NVD ↗ MITRE ↗

EPSS Score

Source: FIRST.org · 2026-05-24

1.28%

probability

This CVE has a 1.28% probability of being exploited in the next 30 days.

0% Top 79.8th 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-664 · Improper Control of a Resource Through its Lifetime CWE-787 · Out-of-bounds Write

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 1.28%

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, with clear evidence of in-the-wild exploitation prior to patching. The timing and explicit zero-day designation in an authoritative source (BleepingComputer reporting on Google's own disclosure) supports confirmed status.

Triage Info

Decided atMar 20, 2026