CVE-2022-43501

CriticalCVSS 9.1/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 9.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-330

Affected software

Vendor	Product	Versions
ZUKEN Elmic	Kasago IPv6/v4 Dual	prior to Ver6.0.1.34
ZUKEN Elmic	Kasago IPv4	prior to Ver6.0.1.34
ZUKEN Elmic	Kasago IPv4 Light	prior to Ver6.0.1.34
ZUKEN Elmic	Kasago mobile IPv6	prior to Ver6.0.1.34

References

https://jvn.jp/en/vu/JVNVU99551468/Third Party Advisory
https://www.elwsc.co.jp/news/6352Vendor Advisory
https://jvn.jp/en/vu/JVNVU99551468/Third Party Advisory
https://www.elwsc.co.jp/news/6352Vendor Advisory

Timeline

Published: Feb 10, 2023
Last modified: Jun 17, 2026
NVD status: Modified

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