CVE intelligence and bounded remediation

CVE-2022-43501 — Elwsc Kasago Ipv4 security vulnerability

Critical CVSS 9.1

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.

Severity
Critical
CVSS
9.1 (3.1)
Published
2023-02-10
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-330

Affected products

  • elwsc / kasago_ipv4
  • elwsc / kasago_ipv4_light
  • elwsc / kasago_ipv6/v4_dual
  • elwsc / kasago_mobile_ipv6

Matched remediation archetype

Cryptography, certificate, signature, and channel validation

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Check exposure

  • Inventory affected algorithms, key uses, trust stores, certificate validation settings, random sources, and plaintext channels across clients and services.
  • Determine which secrets, identities, signatures, or data protections depend on the affected primitive or validation path.
  • Check debug, compatibility, fallback, and hostname or audience override settings in build and runtime configuration.

Remediate safely

  • Use a maintained platform cryptographic API with approved algorithms, modes, parameters, randomness, and full peer identity validation.
  • Remove insecure fallback and validation bypasses; separate keys by purpose and load them from managed secret storage.
  • Plan rotation or reissuance for affected keys, certificates, tokens, hashes, or ciphertext and document compatibility sequencing.

Authoritative sources

Complete CVE record and remediation plan

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