CVE-2022-43501

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2023-02-10. NVD baseline CVSS 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.1Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
56(Track)
EG Risk 56/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
44%
KEV
Not listed

Published

February 10, 2023

Last Modified

March 24, 2025

Advisory Details (2)

Auto-updated Jul 23, 2026
No patch confirmed yet.
generic

ニュース | 図研エルミック

https://www.elwsc.co.jp/news/6352
generic

JVNVU#99551468: Zuken Elmic KASAGO uses insufficient random values for TCP Initial Sequence Numbers

https://jvn.jp/en/vu/JVNVU99551468/

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 40× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 101 total refreshes for this CVE.

  1. 2026-07-26 14:52 UTCEPSS rescore
  2. 2026-07-26 14:52 UTCEPSS rescore
  3. 2026-07-25 14:15 UTCEPSS rescore
  4. 2026-07-24 14:15 UTCEPSS rescore
  5. 2026-07-23 14:16 UTCEPSS rescore
  6. 2026-07-23 02:14 UTCEG score recompute
  7. 2026-07-22 23:02 UTCEG score recompute
  8. 2026-07-22 14:06 UTCEPSS rescore
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  1. 2026-07-08 15:12 UTCEPSS rescore
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  30. 2026-06-18 17:51 UTCEPSS rescore
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  42. 2026-06-10 22:17 UTCEPSS rescore
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  46. 2026-06-07 15:23 UTCEPSS rescore
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  48. 2026-06-06 13:46 UTCEPSS rescore
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  74. 2026-05-26 07:17 UTCEPSS rescore
  75. 2026-05-25 07:06 UTCEG score recompute

Frequently asked(5)

What is CVE-2022-43501?
CVE-2022-43501 is a critical vulnerability published on February 10, 2023. 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.
When was CVE-2022-43501 disclosed?
CVE-2022-43501 was first published in the National Vulnerability Database on February 10, 2023, with the most recent update on March 24, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2022-43501 actively exploited?
CVE-2022-43501 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 56.5% of all scored CVEs.
What is the CVSS score of CVE-2022-43501?
CVE-2022-43501 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2022-43501?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2022-43501, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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