CVE-1999-1033

NONECVSS 0.0Weaponized

0.0

Microsoft Outlook Express before 4.72.3612.1700 allows a malicious user to send a message that contains a .., which can inadvertently cause Outlook to re-enter POP3 command mode and cause the POP3 session to hang.

CVSS v3: —
EG Score: —
EPSS: 92.1%
KEV: Not listed

Published

May 11, 1999

Last Modified

April 16, 2026

References (6)

cve@mitrehttp://marc.info/?l=bugtraq&m=92647407427342&w=2
cve@mitrehttp://marc.info/?l=bugtraq&m=92663402004275&w=2
cve@mitrehttp://www.securityfocus.com/bid/252
af854a3a-2127-422b-91ae-364da2661108http://marc.info/?l=bugtraq&m=92647407427342&w=2
af854a3a-2127-422b-91ae-364da2661108http://marc.info/?l=bugtraq&m=92663402004275&w=2
af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/252

Data Freshness Timeline

(refreshed 11× in last 7d / 18× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-29 13:40 UTCepss_batch
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2026-05-24 16:42 UTCepss_batch
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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-19207✓ verified
First seen May 11, 1999
Microsoft Outlook Express 4.27.3110/4.72.3120 - POP Denial of Service
Open source ↗

Frequently asked(4)

What is CVE-1999-1033?

CVE-1999-1033 is a none vulnerability published on May 11, 1999. Microsoft Outlook Express before 4.72.3612.1700 allows a malicious user to send a message that contains a .., which can inadvertently cause Outlook to re-enter POP3 command mode and cause the POP3 session to hang.

When was CVE-1999-1033 disclosed?

CVE-1999-1033 was first published in the National Vulnerability Database on May 11, 1999, with the most recent update on April 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-1999-1033 actively exploited?

CVE-1999-1033 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 92.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

How do I remediate CVE-1999-1033?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-1999-1033, 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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CVE-1999-1033

📅 Published

🔄 Last Modified

🔗 References (6)