CVE-1999-1431

NONECVSS 0.0Weaponized
0.0
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No confirmed exploitation signals yet
CISA-KEV: Not listedEPSS: 10%CVSS: —Exploit: NoneExposed: 0

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

ZAK in Appstation mode allows users to bypass the "Run only allowed apps" policy by starting Explorer from Office 97 applications (such as Word), installing software into the TEMP directory, and changing the name to that for an allowed application, such as Winword.exe.

CVSS v3
—
EG Score
0.0(none)
EPSS
94.9%
KEV
Not listed

Published

January 7, 2005

Last Modified

June 16, 2026

References (6)

Data Freshness Timeline

(refreshed 2× in last 7d / 16× 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. 2026-07-11 08:22 UTCEPSS rescore
  2. 2026-07-08 15:08 UTCEPSS rescore
  3. 2026-07-04 06:26 UTCEPSS rescore
  4. 2026-07-02 14:00 UTCEPSS rescore
  5. 2026-06-29 14:02 UTCEPSS rescore
  6. 2026-06-28 14:02 UTCEPSS rescore
  7. 2026-06-27 03:04 UTCEPSS rescore
  8. 2026-06-24 14:01 UTCEPSS rescore
  9. 2026-06-23 21:29 UTCEPSS rescore
  10. 2026-06-22 14:22 UTCEPSS rescore
  11. 2026-06-21 01:56 UTCEPSS rescore
  12. 2026-06-18 17:49 UTCEPSS rescore
  13. 2026-06-18 17:49 UTCEPSS rescore
  14. 2026-06-17 17:49 UTCEPSS rescore
  15. 2026-06-16 17:49 UTCEPSS rescore
  16. 2026-06-14 23:13 UTCEPSS rescore
  17. 2026-06-13 22:56 UTCEPSS rescore
  18. 2026-06-12 23:07 UTCEPSS rescore
  19. 2026-06-11 13:55 UTCEPSS rescore
  20. 2026-06-10 22:13 UTCEPSS rescore
  21. 2026-06-10 13:17 UTCEPSS rescore
  22. 2026-06-08 14:13 UTCEPSS rescore
  23. 2026-06-07 15:21 UTCEPSS rescore
  24. 2026-06-05 06:07 UTCEPSS rescore
  25. 2026-06-04 13:09 UTCEPSS rescore
Show 26 more
  1. 2026-06-02 20:10 UTCEPSS rescore
  2. 2026-05-31 22:27 UTCEPSS rescore
  3. 2026-05-31 14:38 UTCEG score recompute
  4. 2026-05-31 14:38 UTCGHSA enrichment
  5. 2026-05-31 00:13 UTCEPSS rescore
  6. 2026-05-31 00:13 UTCEPSS rescore
  7. 2026-05-29 13:40 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. 2026-05-28 13:42 UTCEPSS rescore
  12. 2026-05-27 13:37 UTCEPSS rescore
  13. 2026-05-27 13:37 UTCEPSS rescore
  14. 2026-05-26 13:41 UTCEPSS rescore
  15. 2026-05-26 13:41 UTCEPSS rescore
  16. 2026-05-26 13:41 UTCEPSS rescore
  17. 2026-05-26 07:16 UTCEPSS rescore
  18. 2026-05-26 07:16 UTCEPSS rescore
  19. 2026-05-24 16:42 UTCEPSS rescore
  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. 2026-05-18 21:29 UTCEPSS rescore
  26. 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-19144✓ verified
    First seen Jan 7, 1999

    Microsoft Zero Administration Kit (ZAK) 1.0 / Office97 - Backdoor Access

    Open source ↗

Frequently asked(4)

What is CVE-1999-1431?
CVE-1999-1431 is a none vulnerability published on January 7, 2005. ZAK in Appstation mode allows users to bypass the "Run only allowed apps" policy by starting Explorer from Office 97 applications (such as Word), installing software into the TEMP directory, and changing the name to that for an allowed application, such as Winword.exe.
When was CVE-1999-1431 disclosed?
CVE-1999-1431 was first published in the National Vulnerability Database on January 7, 2005, 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-1999-1431 actively exploited?
CVE-1999-1431 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 94.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-1999-1431?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-1999-1431, 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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