CVE-1999-0006

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 7.7%, top 8% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Weaponized
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 12%CVSS: 9.8Exploit: NoneExposed: 0

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

Buffer overflow in POP servers based on BSD/Qualcomm's qpopper allows remote attackers to gain root access using a long PASS command.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
95.6%
KEV
Not listed

Published

July 14, 1998

Last Modified

June 16, 2026

Advisory Details (1)

Auto-updated Jun 20, 2026
No patch confirmed yet.
generic
http://www.securityfocus.com/bid/133

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 3× in last 7d / 15× 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. 2026-07-13 06:07 UTCEPSS rescore
  2. 2026-07-11 08:22 UTCEPSS rescore
  3. 2026-07-08 15:08 UTCEPSS rescore
  4. 2026-07-02 14:00 UTCEPSS rescore
  5. 2026-06-28 14:02 UTCEPSS rescore
  6. 2026-06-27 03:04 UTCEPSS rescore
  7. 2026-06-24 14:01 UTCEPSS rescore
  8. 2026-06-23 21:29 UTCEPSS rescore
  9. 2026-06-22 14:22 UTCEPSS rescore
  10. 2026-06-21 01:56 UTCEPSS rescore
  11. 2026-06-18 17:49 UTCEPSS rescore
  12. 2026-06-18 17:49 UTCEPSS rescore
  13. 2026-06-17 17:49 UTCEPSS rescore
  14. 2026-06-16 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. 2026-06-11 13:55 UTCEPSS rescore
  19. 2026-06-10 22:13 UTCEPSS rescore
  20. 2026-06-10 13:17 UTCEPSS rescore
  21. 2026-06-08 14:13 UTCEPSS rescore
  22. 2026-06-07 15:21 UTCEPSS rescore
  23. 2026-06-06 13:44 UTCEPSS rescore
  24. 2026-06-05 06:07 UTCEPSS rescore
  25. 2026-06-04 13:09 UTCEPSS rescore
Show 42 more
  1. 2026-06-02 20:10 UTCEPSS rescore
  2. 2026-06-01 13:48 UTCEPSS rescore
  3. 2026-05-31 22:27 UTCEPSS rescore
  4. 2026-05-31 00:13 UTCEPSS rescore
  5. 2026-05-31 00:13 UTCEPSS rescore
  6. 2026-05-29 13:40 UTCEPSS rescore
  7. 2026-05-28 13:42 UTCEPSS rescore
  8. 2026-05-28 13:42 UTCEPSS rescore
  9. 2026-05-28 13:42 UTCEPSS rescore
  10. 2026-05-28 13:42 UTCEPSS rescore
  11. 2026-05-27 13:37 UTCEPSS rescore
  12. 2026-05-27 13:37 UTCEPSS rescore
  13. 2026-05-26 13:41 UTCEPSS rescore
  14. 2026-05-26 13:41 UTCEPSS rescore
  15. 2026-05-26 13:41 UTCEPSS rescore
  16. 2026-05-26 07:16 UTCEPSS rescore
  17. 2026-05-26 07:16 UTCEPSS rescore
  18. 2026-05-24 16:42 UTCEPSS rescore
  19. 2026-05-23 00:10 UTCEG score recompute
  20. 2026-05-22 21:15 UTCEPSS rescore
  21. 2026-05-21 22:38 UTCEPSS rescore
  22. 2026-05-20 22:36 UTCEPSS rescore
  23. 2026-05-20 11:20 UTCEPSS rescore
  24. 2026-05-20 11:20 UTCEPSS rescore
  25. 2026-05-20 08:10 UTCEG score recompute
  26. 2026-05-20 08:10 UTCGHSA enrichment
  27. 2026-05-20 03:52 UTCEG score recompute
  28. 2026-05-20 03:52 UTCGHSA enrichment
  29. 2026-05-19 23:34 UTCEG score recompute
  30. 2026-05-19 23:34 UTCGHSA enrichment
  31. 2026-05-19 19:16 UTCEG score recompute
  32. 2026-05-19 19:16 UTCGHSA enrichment
  33. 2026-05-19 14:59 UTCEG score recompute
  34. 2026-05-19 14:59 UTCGHSA enrichment
  35. 2026-05-19 10:37 UTCEG score recompute
  36. 2026-05-19 10:37 UTCGHSA enrichment
  37. 2026-05-19 06:18 UTCEG score recompute
  38. 2026-05-19 06:18 UTCGHSA enrichment
  39. 2026-05-19 02:00 UTCEG score recompute
  40. 2026-05-19 02:00 UTCGHSA enrichment
  41. 2026-05-18 21:29 UTCEPSS rescore
  42. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(2 references)

Working exploit code is in the public domain (2 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-19109✓ verified
    First seen Jun 27, 1998

    Qualcomm qpopper 2.4 - POP Server Buffer Overflow (1)

    Open source ↗
  • Exploit-DBEDB-19110✓ verified
    First seen Jun 27, 1998

    Qualcomm qpopper 2.4 - POP Server Buffer Overflow (2)

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-1999-0006?
CVE-1999-0006 is a critical vulnerability published on July 14, 1998. Buffer overflow in POP servers based on BSD/Qualcomm's qpopper allows remote attackers to gain root access using a long PASS command.
When was CVE-1999-0006 disclosed?
CVE-1999-0006 was first published in the National Vulnerability Database on July 14, 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-1999-0006 actively exploited?
CVE-1999-0006 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 95.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-1999-0006?
CVE-1999-0006 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-1999-0006?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-1999-0006, 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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