CVE-1999-1033
MEDIUMEPSS 97th pctlDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v2 Vector
No CVSS vector data available.
Exploit Intelligence
Very high risk: more likely to be exploited than 97% of all known CVEs.
References
Common questions
How do I fix CVE-1999-1033?
No published fix for CVE-1999-1033 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-1999-1033 being actively exploited?
Not that we know of. CVE-1999-1033 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 17.5% is the estimated probability that it will be exploited in the next 30 days. That is higher than 97% of all scored CVEs.
How severe is CVE-1999-1033?
CVE-1999-1033 has a CVSS v2 base score of 5.0, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-16.