CVE-1999-0016

MEDIUMCVSS v2 · 5.05.0—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 5.0 — v2 rates that MEDIUM (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:N/I:N/A:P. 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 95.7% 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
Weaponized
5.0EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 96%
  • Public exploit code is available (Exploit-DB (verified), epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 96%CVSS v2: 5.0Exploit: Exploit-DB (verified) · epss top5pct · epss high · public exploitExposed: 0

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

Land IP denial of service.

CVSS v2.0 (legacy)
5.0MEDIUMNVD never assigned a CVSS v3 rating to this CVE
EG Score
5.0(low)
EG Risk
65(Track)
EG Risk 65/100SSVC: 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
Severity50% × 45%
Exploitation96% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
96%
EPSS %ILE
100%
KEV
Not listed

Published

December 1, 1997

Last Modified

June 16, 2026

References (3)

Data Freshness Timeline

(refreshed 7× in last 7d / 9× 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 13:18 UTCEG score recompute▲ 5.00
  2. 2026-07-23 00:40 UTCEG score recompute
  3. 2026-07-23 00:26 UTCGHSA enrichment
  4. 2026-07-23 00:22 UTCEG score recompute▼ 9.00
  5. 2026-07-22 23:45 UTCEG score recompute
  6. 2026-07-22 21:21 UTCEG score recompute▲ 9.00
  7. 2026-07-22 21:21 UTCGHSA enrichment
  8. 2026-06-29 14:02 UTCEPSS rescore
  9. 2026-06-28 14:02 UTCEPSS rescore
  10. 2026-06-24 14:01 UTCEPSS rescore
  11. 2026-06-23 21:29 UTCEPSS rescore
  12. 2026-06-16 17:49 UTCEPSS rescore
  13. 2026-06-12 23:07 UTCEPSS rescore
  14. 2026-06-10 22:13 UTCEPSS rescore
  15. 2026-06-10 13:17 UTCEPSS rescore
  16. 2026-06-06 13:44 UTCEPSS rescore
  17. 2026-06-05 06:07 UTCEPSS rescore
  18. 2026-06-04 13:09 UTCEPSS rescore
  19. 2026-06-02 20:10 UTCEPSS rescore
  20. 2026-06-01 13:48 UTCEPSS rescore
  21. 2026-05-31 22:58 UTCEG score recompute
  22. 2026-05-31 22:58 UTCGHSA enrichment
  23. 2026-05-31 22:27 UTCEPSS rescore
  24. 2026-05-31 00:13 UTCEPSS rescore
  25. 2026-05-31 00:13 UTCEPSS rescore
Show 12 more
  1. 2026-05-27 13:37 UTCEPSS rescore
  2. 2026-05-27 13:37 UTCEPSS rescore
  3. 2026-05-26 13:41 UTCEPSS rescore
  4. 2026-05-26 13:41 UTCEPSS rescore
  5. 2026-05-26 13:41 UTCEPSS rescore
  6. 2026-05-26 07:16 UTCEPSS rescore
  7. 2026-05-26 07:16 UTCEPSS rescore
  8. 2026-05-22 21:15 UTCEPSS rescore
  9. 2026-05-21 22:38 UTCEPSS rescore
  10. 2026-05-20 22:36 UTCEPSS rescore
  11. 2026-05-18 21:29 UTCEPSS rescore
  12. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(5 references)

Working exploit code is in the public domain (5 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-20810✓ verified
    First seen Nov 20, 1997

    FreeBSD 2.x / HP-UX 9/10/11 / Kernel 2.0.3 / Windows NT 4.0/Server 2003 / NetBSD 1 - 'land.c' loopback Denial of Service (1)

    Open source ↗
  • Exploit-DBEDB-20811✓ verified
    First seen Nov 20, 1997

    FreeBSD 2.x / HP-UX 9/10/11 / Kernel 2.0.3 / Windows NT 4.0/Server 2003 / NetBSD 1 - 'land.c' loopback Denial of Service (2)

    Open source ↗
  • Exploit-DBEDB-20813✓ verified
    First seen Nov 20, 1997

    FreeBSD 2.x / HP-UX 9/10/11 / Kernel 2.0.3 / Windows NT 4.0/Server 2003 / NetBSD 1 - 'land.c' loopback Denial of Service (4)

    Open source ↗
  • Exploit-DBEDB-20812✓ verified
    First seen Nov 20, 1997

    FreeBSD 2.x / HP-UX 9/10/11 / Kernel 2.0.3 / Windows NT 4.0/Server 2003 / NetBSD 1 - 'land.c' loopback Denial of Service (3)

    Open source ↗
  • Exploit-DBEDB-20814✓ verified
    First seen Nov 20, 1997

    FreeBSD 2.x / HP-UX 9/10/11 / Kernel 2.0.3 / Windows NT 4.0/Server 2003 / NetBSD 1 - 'land.c' loopback Denial of Service (5)

    Open source ↗

Frequently asked(4)

What is CVE-1999-0016?
CVE-1999-0016 is a medium vulnerability published on December 1, 1997. Land IP denial of service.
When was CVE-1999-0016 disclosed?
CVE-1999-0016 was first published in the National Vulnerability Database on December 1, 1997, 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-1999-0016 actively exploited?
CVE-1999-0016 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 96% probability of exploitation in the next 30 days, which ranks it in the top 0.1% of all scored CVEs.
How do I remediate CVE-1999-0016?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-1999-0016, 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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