CVE-1999-0874

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 74.7% 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
10.0EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 75%
  • Public exploit code is available (Metasploit, Exploit-DB (verified), epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 75%CVSS v2: 10.0Exploit: Metasploit · 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.

Buffer overflow in IIS 4.0 allows remote attackers to cause a denial of service via a malformed request for files with .HTR, .IDC, or .STM extensions.

CVSS v2.0 (legacy)
10.0HIGHNVD never assigned a CVSS v3 rating to this CVE
EG Score
10.0(low)
EG Risk
79(Track)
EG Risk 79/100SSVC: 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%
Exploitation75% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
75%
EPSS %ILE
99%
KEV
Not listed

Published

June 16, 1999

Last Modified

June 16, 2026

References (10)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 10× 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 13:19 UTCEG score recompute▲ 10.00
  2. 2026-07-23 00:41 UTCEG score recompute
  3. 2026-07-23 00:23 UTCEG score recompute▼ 7.30
  4. 2026-07-22 23:46 UTCEG score recompute▲ 7.30
  5. 2026-07-22 21:25 UTCEG score recompute
  6. 2026-07-20 17:02 UTCEPSS rescore
  7. 2026-07-18 09:59 UTCEPSS rescore
  8. 2026-07-15 16:53 UTCEPSS rescore
  9. 2026-07-15 01:55 UTCEPSS rescore
  10. 2026-07-02 14:00 UTCEPSS rescore
  11. 2026-06-27 03:04 UTCEPSS rescore
  12. 2026-06-23 21:29 UTCEPSS rescore
  13. 2026-06-21 01:56 UTCEPSS rescore
  14. 2026-06-17 17:49 UTCEPSS rescore
  15. 2026-06-14 23:13 UTCEPSS rescore
  16. 2026-06-13 22:56 UTCEPSS rescore
  17. 2026-06-12 23:07 UTCEPSS rescore
  18. 2026-06-10 22:13 UTCEPSS rescore
  19. 2026-06-10 13:17 UTCEPSS rescore
  20. 2026-06-08 14:13 UTCEPSS rescore
  21. 2026-06-06 13:44 UTCEPSS rescore
  22. 2026-06-04 13:09 UTCEPSS rescore
  23. 2026-06-01 13:48 UTCEPSS rescore
  24. 2026-05-31 22:27 UTCEPSS rescore
  25. 2026-05-31 22:25 UTCEG score recompute
Show 12 more
  1. 2026-05-31 22:25 UTCGHSA enrichment
  2. 2026-05-28 13:42 UTCEPSS rescore
  3. 2026-05-28 13:42 UTCEPSS rescore
  4. 2026-05-28 13:42 UTCEPSS rescore
  5. 2026-05-28 13:42 UTCEPSS rescore
  6. 2026-05-27 13:37 UTCEPSS rescore
  7. 2026-05-27 13:37 UTCEPSS rescore
  8. 2026-05-24 16:42 UTCEPSS rescore
  9. 2026-05-22 21:15 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

(6 references)

Working exploit code is in the public domain (1 Metasploit module) (5 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-16468✓ verified
    First seen Apr 30, 2010

    Microsoft IIS 4.0 - '.htr' Path Overflow (MS02-018) (Metasploit)

    Open source ↗
  • Metasploitexploit/windows/iis/ms02_018_htr✓ verified
    First seen Apr 10, 2002

    MS02-018 Microsoft IIS 4.0 .HTR Path Overflow

    Open source ↗
  • Exploit-DBEDB-19247✓ verified
    First seen Jun 15, 1999

    Microsoft IIS 4.0 - Remote Buffer Overflow (3)

    Open source ↗
  • Exploit-DBEDB-19245✓ verified
    First seen Jun 15, 1999

    Microsoft IIS 4.0 - Remote Buffer Overflow (1)

    Open source ↗
  • Exploit-DBEDB-19246✓ verified
    First seen Jun 15, 1999

    Microsoft IIS 4.0 - Remote Buffer Overflow (2)

    Open source ↗
  • Exploit-DBEDB-19248✓ verified
    First seen Jun 15, 1999

    Microsoft IIS 4.0 - Remote Buffer Overflow (4)

    Open source ↗

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-1999-0874?
CVE-1999-0874 is a high vulnerability published on June 16, 1999. Buffer overflow in IIS 4.0 allows remote attackers to cause a denial of service via a malformed request for files with .HTR, .IDC, or .STM extensions.
When was CVE-1999-0874 disclosed?
CVE-1999-0874 was first published in the National Vulnerability Database on June 16, 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-1999-0874 actively exploited?
CVE-1999-0874 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 75% probability of exploitation in the next 30 days, which ranks it in the top 0.6% of all scored CVEs.
How do I remediate CVE-1999-0874?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-1999-0874, 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

Explore the affected products and dependency analysis for CVE-1999-0874

Explore →

Is Your Infrastructure Affected by CVE-1999-0874?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs