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CVE-2022-43501

27
FAUCET Score

CVE-2022-43501 affects Zuken Elmic KASAGO TCP/IP stack products, including kasago_ipv4 and kasago_ipv6/v4_dual, due to insufficient randomness in Initial Sequence Number (ISN) generation. This critical vulnerability (CVSS 9.1) allows an unauthenticated attacker to remotely hijack existing TCP connections or spoof future ones, leading to high impact on confidentiality and integrity. While no public exploits or active exploitation have been observed, and community discussion is minimal, the inherent ease of exploitation (low attack complexity) warrants attention.

Impacted Technologies

VendorProductVersion(s)CPE
< 6.0.1.34CPE matchmatch criteria
cpe:2.3:a:elwsc:kasago_ipv4:*:*:*:*:*:*:*:*
< 6.0.1.34CPE matchmatch criteria
cpe:2.3:a:elwsc:kasago_ipv4_light:*:*:*:*:*:*:*:*
< 6.0.1.34CPE matchmatch criteria
cpe:2.3:a:elwsc:kasago_ipv6\/v4_dual:*:*:*:*:*:*:*:*
< 6.0.1.34CPE matchmatch criteria
cpe:2.3:a:elwsc:kasago_mobile_ipv6:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.1CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.56%
Probability of exploitation in next 30 days
EPSS Percentile
43.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0056 is in the 23rd percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

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