CVE-1999-1199

HIGHCVSS v2 · 10.010.0—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 10.0 — v2 rates that HIGH (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has no CRITICAL band). Vector AV:N/AC:L/Au:N/C:C/I:C/A:C. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 6.8% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.

Sources: epss, nvd_v2
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 7%CVSS v2: 10.0Exploit: None knownExposed: 0

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

Apache WWW server 1.3.1 and earlier allows remote attackers to cause a denial of service (resource exhaustion) via a large number of MIME headers with the same name, aka the "sioux" vulnerability.

CVSS v2.0 (legacy)
10.0HIGHNVD never assigned a CVSS v3 rating to this CVE
EG Score
10.0(low)
EG Risk
52(Track)
EG Risk 52/100SSVC: 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
Severity100% × 45%
Exploitation7% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
7%
EPSS %ILE
93%
KEV
Not listed

Published

August 7, 1998

Last Modified

June 16, 2026

References (18)

Data Freshness Timeline

(refreshed 5× in last 7d / 17× 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. 2026-07-26 13:20 UTCEG score recompute▲ 10.00
  2. 2026-07-23 00:41 UTCEG score recompute
  3. 2026-07-23 00:23 UTCEG score recompute
  4. 2026-07-22 23:46 UTCEG score recompute
  5. 2026-07-22 21:26 UTCEG score recompute
  6. 2026-07-20 17:02 UTCEPSS rescore
  7. 2026-07-18 09:59 UTCEPSS rescore
  8. 2026-07-16 16:58 UTCEPSS rescore
  9. 2026-07-15 16:53 UTCEPSS rescore
  10. 2026-07-15 01:55 UTCEPSS rescore
  11. 2026-07-13 06:07 UTCEPSS rescore
  12. 2026-07-11 08:22 UTCEPSS rescore
  13. 2026-07-08 15:08 UTCEPSS rescore
  14. 2026-07-04 06:26 UTCEPSS rescore
  15. 2026-07-02 14:00 UTCEPSS rescore
  16. 2026-06-29 14:02 UTCEPSS rescore
  17. 2026-06-28 14:02 UTCEPSS rescore
  18. 2026-06-27 03:04 UTCEPSS rescore
  19. 2026-06-24 14:01 UTCEPSS rescore
  20. 2026-06-23 21:29 UTCEPSS rescore
  21. 2026-06-22 14:22 UTCEPSS rescore
  22. 2026-06-19 19:22 UTCEPSS rescore
  23. 2026-06-18 17:49 UTCEPSS rescore
  24. 2026-06-18 17:49 UTCEPSS rescore
  25. 2026-06-17 17:49 UTCEPSS rescore
Show 37 more
  1. 2026-06-16 17:49 UTCEPSS rescore
  2. 2026-06-14 23:13 UTCEPSS rescore
  3. 2026-06-13 22:56 UTCEPSS rescore
  4. 2026-06-12 23:07 UTCEPSS rescore
  5. 2026-06-11 13:55 UTCEPSS rescore
  6. 2026-06-10 22:13 UTCEPSS rescore
  7. 2026-06-10 13:17 UTCEPSS rescore
  8. 2026-06-08 14:13 UTCEPSS rescore
  9. 2026-06-07 15:21 UTCEPSS rescore
  10. 2026-06-05 06:07 UTCEPSS rescore
  11. 2026-06-04 13:09 UTCEPSS rescore
  12. 2026-06-02 20:10 UTCEPSS rescore
  13. 2026-06-01 13:48 UTCEPSS rescore
  14. 2026-05-31 22:49 UTCEG score recompute
  15. 2026-05-31 22:49 UTCGHSA enrichment
  16. 2026-05-31 22:27 UTCEPSS rescore
  17. 2026-05-31 00:13 UTCEPSS rescore
  18. 2026-05-31 00:13 UTCEPSS rescore
  19. 2026-05-29 13:40 UTCEPSS rescore
  20. 2026-05-28 13:42 UTCEPSS rescore
  21. 2026-05-28 13:42 UTCEPSS rescore
  22. 2026-05-28 13:42 UTCEPSS rescore
  23. 2026-05-28 13:42 UTCEPSS rescore
  24. 2026-05-27 13:37 UTCEPSS rescore
  25. 2026-05-27 13:37 UTCEPSS rescore
  26. 2026-05-26 13:41 UTCEPSS rescore
  27. 2026-05-26 13:41 UTCEPSS rescore
  28. 2026-05-26 13:41 UTCEPSS rescore
  29. 2026-05-26 07:16 UTCEPSS rescore
  30. 2026-05-26 07:16 UTCEPSS rescore
  31. 2026-05-24 16:42 UTCEPSS rescore
  32. 2026-05-21 22:38 UTCEPSS rescore
  33. 2026-05-20 22:36 UTCEPSS rescore
  34. 2026-05-20 11:20 UTCEPSS rescore
  35. 2026-05-20 11:20 UTCEPSS rescore
  36. 2026-05-18 21:29 UTCEPSS rescore
  37. 2026-05-18 21:29 UTCEPSS rescore

Frequently asked(4)

What is CVE-1999-1199?
CVE-1999-1199 is a high vulnerability published on August 7, 1998. Apache WWW server 1.3.1 and earlier allows remote attackers to cause a denial of service (resource exhaustion) via a large number of MIME headers with the same name, aka the "sioux" vulnerability.
When was CVE-1999-1199 disclosed?
CVE-1999-1199 was first published in the National Vulnerability Database on August 7, 1998, 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-1999-1199 actively exploited?
CVE-1999-1199 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 7% probability of exploitation in the next 30 days, which ranks it in the top 6.7% of all scored CVEs.
How do I remediate CVE-1999-1199?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-1999-1199, 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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