CVE-2021-37973 is a vulnerability tracked by ThreatCluster, appearing in 1 threat cluster built from 1 intelligence report mention.
CVE-2021-37973 is a vulnerability tracked across 1 threat cluster and 1 intelligence report mention on ThreatCluster. First observed March 5, 2026; most recent activity March 5, 2026.
Google's Threat Intelligence Group tracked 90 zero-day vulnerabilities exploited in 2025, a rise from 78 in 2024. Less than half of these vulnerabilities were attributed to specific threat actors, with spyware vendors…
CVE-2021-37973 is a vulnerability tracked by ThreatCluster, appearing in 1 threat cluster built from 1 intelligence report mention.
The most recent intelligence report mentioning CVE-2021-37973 on ThreatCluster is dated March 5, 2026.
Across ThreatCluster reporting, CVE-2021-37973 most frequently co-occurs with PRC-nexus, Unc3886, Unc5221, Malware, Cisco, among 12 tracked related entities.
The most significant recent cluster is “Google Reports 90 Exploited Zero-Day Vulnerabilities in 2025” (35 articles · Updated March 5, 2026). CVE-2021-37973 appears across 1 threat cluster in total, listed above with sources.
CVE-2021-37973 appears in 1 intelligence report mention across 1 deduplicated threat cluster, aggregated from 17,000+ monitored sources.