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CVE-2022-43501
KASAGO TCP/IP stack provided by Zuken Elmic generates ISNs(Initial Sequence Number) for TCP connections from an insufficiently random…
Critical9.1EPSS 0.56%
- Published
- Updated
- Reserved
- Assigned by
- jpcert
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | Critical9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
| NVDNVD · Modified | 3.1 | Critical9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.56% · top 53% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.1.
Weakness
Affected products
ZUKEN Elmic · Kasago IPv6/v4 Dual
- affected prior to Ver6.0.1.34
- affected prior to Ver6.0.1.34
ZUKEN Elmic · Kasago IPv4 Light
- affected prior to Ver6.0.1.34
ZUKEN Elmic · Kasago mobile IPv6
- affected prior to Ver6.0.1.34
References (2)
- https://www.elwsc.co.jp/news/6352 (opens in a new tab)x_transferred
- Zuken Elmic KASAGO uses insufficient random values for TCP Initial Sequence Numbers (opens in a new tab)third-party-advisoryx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2022-43501)Record last updated .