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.
References (2)
Core 2
Core References
Vendor Advisory
https://www.elwsc.co.jp/news/6352
Third Party Advisory third-party-advisory
https://jvn.jp/en/vu/JVNVU99551468/
Scores
CVSS v3
9.1
EPSS
0.0056
EPSS Percentile
42.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
total
Details
CWE
CWE-330
Status
published
Products (4)
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
Published
Feb 10, 2023
Tracked Since
Feb 18, 2026