CVE-1999-0426

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: HIGH) published 2022-04-30. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Weaponized
9.8EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • Public exploit code is available (Exploit-DB (verified), epss top5pct, public exploit)
CISA-KEV: Not listedEPSS PROB: 11%CVSS: 9.8Exploit: Exploit-DB (verified) · epss top5pct · public exploitExposed: 0

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

The default permissions of /dev/kmem in Linux versions before 2.0.36 allows IP spoofing.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Track*)
EG Risk 75/100SSVC: 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
Severity98% × 45%
Exploitation65% × 40%
Automatability30% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
11%
EPSS %ILE
95%
KEV
Not listed

Published

March 1, 1999

Last Modified

June 16, 2026

Advisory Details (1)

Auto-updated Jul 26, 2026
No patch confirmed yet.
generic

IBM X-Force Exchange

https://exchange.xforce.ibmcloud.com/vulnerabilities/CVE-1999-0426

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 14× 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.

  1. 2026-07-23 00:40 UTCEG score recompute
  2. 2026-07-23 00:23 UTCEG score recompute
  3. 2026-07-22 23:45 UTCEG score recompute
  4. 2026-07-22 21:25 UTCEG score recompute
  5. 2026-07-20 17:02 UTCEPSS rescore
  6. 2026-07-18 09:59 UTCEPSS rescore
  7. 2026-07-16 16:58 UTCEPSS rescore
  8. 2026-07-15 16:53 UTCEPSS rescore
  9. 2026-07-15 01:55 UTCEPSS rescore
  10. 2026-07-11 08:22 UTCEPSS rescore
  11. 2026-07-08 15:08 UTCEPSS rescore
  12. 2026-07-04 06:26 UTCEPSS rescore
  13. 2026-07-02 14:00 UTCEPSS rescore
  14. 2026-06-28 14:02 UTCEPSS rescore
  15. 2026-06-27 03:04 UTCEPSS rescore
  16. 2026-06-24 14:01 UTCEPSS rescore
  17. 2026-06-23 21:29 UTCEPSS rescore
  18. 2026-06-22 14:22 UTCEPSS rescore
  19. 2026-06-21 01:56 UTCEPSS rescore
  20. 2026-06-19 19:22 UTCEPSS rescore
  21. 2026-06-18 17:49 UTCEPSS rescore
  22. 2026-06-18 17:49 UTCEPSS rescore
  23. 2026-06-17 17:49 UTCEPSS rescore
  24. 2026-06-16 17:49 UTCEPSS rescore
  25. 2026-06-13 22:56 UTCEPSS rescore
Show 43 more
  1. 2026-06-12 23:07 UTCEPSS rescore
  2. 2026-06-11 13:55 UTCEPSS rescore
  3. 2026-06-10 22:13 UTCEPSS rescore
  4. 2026-06-10 13:17 UTCEPSS rescore
  5. 2026-06-08 14:13 UTCEPSS rescore
  6. 2026-06-07 15:21 UTCEPSS rescore
  7. 2026-06-06 13:44 UTCEPSS rescore
  8. 2026-06-05 06:07 UTCEPSS rescore
  9. 2026-06-04 13:09 UTCEPSS rescore
  10. 2026-06-02 20:10 UTCEPSS rescore
  11. 2026-06-01 13:48 UTCEPSS rescore
  12. 2026-05-31 22:27 UTCEPSS rescore
  13. 2026-05-31 00:13 UTCEPSS rescore
  14. 2026-05-31 00:13 UTCEPSS rescore
  15. 2026-05-29 13:40 UTCEPSS rescore
  16. 2026-05-28 13:42 UTCEPSS rescore
  17. 2026-05-28 13:42 UTCEPSS rescore
  18. 2026-05-28 13:42 UTCEPSS rescore
  19. 2026-05-28 13:42 UTCEPSS rescore
  20. 2026-05-27 13:37 UTCEPSS rescore
  21. 2026-05-27 13:37 UTCEPSS rescore
  22. 2026-05-26 13:41 UTCEPSS rescore
  23. 2026-05-26 13:41 UTCEPSS rescore
  24. 2026-05-26 13:41 UTCEPSS rescore
  25. 2026-05-26 07:16 UTCEPSS rescore
  26. 2026-05-26 07:16 UTCEPSS rescore
  27. 2026-05-24 16:42 UTCEPSS rescore
  28. 2026-05-22 21:15 UTCEPSS rescore
  29. 2026-05-21 22:38 UTCEPSS rescore
  30. 2026-05-20 22:36 UTCEPSS rescore
  31. 2026-05-20 11:20 UTCEPSS rescore
  32. 2026-05-20 11:20 UTCEPSS rescore
  33. 2026-05-20 07:34 UTCGHSA enrichment
  34. 2026-05-20 03:34 UTCGHSA enrichment
  35. 2026-05-19 23:10 UTCGHSA enrichment
  36. 2026-05-19 19:09 UTCGHSA enrichment
  37. 2026-05-19 14:47 UTCGHSA enrichment
  38. 2026-05-19 10:17 UTCGHSA enrichment
  39. 2026-05-19 05:58 UTCGHSA enrichment
  40. 2026-05-19 02:01 UTCEG score recompute
  41. 2026-05-19 02:01 UTCGHSA enrichment
  42. 2026-05-18 21:29 UTCEPSS rescore
  43. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-19458✓ verified
    First seen Jul 31, 1999

    Linux Kernel 2.0.30/2.0.35/2.0.36/2.0.37 - Blind TCP Spoofing

    Open source ↗

Frequently asked(5)

What is CVE-1999-0426?
CVE-1999-0426 is a critical vulnerability published on March 1, 1999. The default permissions of /dev/kmem in Linux versions before 2.0.36 allows IP spoofing.
When was CVE-1999-0426 disclosed?
CVE-1999-0426 was first published in the National Vulnerability Database on March 1, 1999, with the most recent update on June 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-1999-0426 actively exploited?
CVE-1999-0426 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 11% probability of exploitation in the next 30 days, which ranks it in the top 4.7% of all scored CVEs.
What is the CVSS score of CVE-1999-0426?
CVE-1999-0426 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-1999-0426?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-1999-0426, 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.

Dependency Blast Radius

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