CVE-2021-37592: Oisf Suricata

Critical severity, CVSS 9.8. EPSS: 1.6% chance of exploitation in the next 30 days.

Suricata before 5.0.8 and 6.x before 6.0.4 allows TCP evasion via a client with a crafted TCP/IP stack that can send a certain sequence of segments.

Affected products

• Oisf Suricata: before 5.0.8 (fixed in 5.0.8); from 6.0.0, before 6.0.4 (fixed in 6.0.4)

Published 2021-11-19. Last modified 2026-06-17.