CVE-2021-34535 is a vulnerability tracked by ThreatCluster, appearing in 1 threat cluster built from 2 intelligence report mentions.
CVE-2021-34535 is a vulnerability tracked across 1 threat cluster and 2 intelligence report mentions on ThreatCluster. First observed August 6, 2026; most recent activity August 6, 2026.
At Black Hat USA 2026, researcher Malcolm Stagg disclosed NatJack, a new attack class exploiting design flaws in Network Address Translation (NAT) systems. All 32 tested NAT products across Windows, Linux, and macOS…
CVE-2021-34535 is a vulnerability tracked by ThreatCluster, appearing in 1 threat cluster built from 2 intelligence report mentions.
The most recent intelligence report mentioning CVE-2021-34535 on ThreatCluster is dated August 6, 2026.
Across ThreatCluster reporting, CVE-2021-34535 most frequently co-occurs with DDoS, CVE-2024-0333, CVE-2026-56181, CVE-2026-63913, Hyper-V, among 8 tracked related entities.
The most significant recent cluster is “NatJack Attack Class Exposes Vulnerabilities in NAT Implementations” (10 articles · Updated August 6, 2026). CVE-2021-34535 appears across 1 threat cluster in total, listed above with sources.
CVE-2021-34535 appears in 2 intelligence report mentions across 1 deduplicated threat cluster, aggregated from 17,000+ monitored sources.