CVE-2022-43501

Severity: critical (CVSS 9.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-02-10 · updated 2026-06-17
Weakness: CWE-330

Description

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

How to fix

Upgrade to a fixed version: Elwsc Kasago Ipv4 6.0.1.34; Elwsc Kasago Ipv4 Light 6.0.1.34; Elwsc Kasago Ipv6/V4 Dual 6.0.1.34; Elwsc Kasago Mobile Ipv6 6.0.1.34. Check the vendor advisory for mitigations.

References

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