CVE-2022-43501: Elwsc Kasago IPV4

Critical severity, CVSS 9.1. EPSS: 0.6% chance of exploitation in the next 30 days.

KASAGO TCP/IP stack provided by Zuken Elmic generates ISNs(Initial Sequence Number) for TCP connections from an insufficiently random source. An attacker may be able to determine the ISN of the current or future TCP connections and either hijack existing ones or spoof future ones.

Affected products

• Elwsc Kasago IPV4: before 6.0.1.34 (fixed in 6.0.1.34)
• Elwsc Kasago IPV4 Light: before 6.0.1.34 (fixed in 6.0.1.34)
• Elwsc Kasago IPV6/V4 Dual: before 6.0.1.34 (fixed in 6.0.1.34)
• Elwsc Kasago Mobile IPv6: before 6.0.1.34 (fixed in 6.0.1.34)

Published 2023-02-10. Last modified 2026-06-17.