CVE-1999-1551
MEDIUMEPSS 99th pctlDescription
Buffer overflow in Ipswitch IMail Service 5.0 allows an attacker to cause a denial of service (crash) and possibly execute arbitrary commands via a long URL.
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 99% of all known CVEs.
References
Common questions
How do I fix CVE-1999-1551?
No published fix for CVE-1999-1551 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-1999-1551 being actively exploited?
Not that we know of. CVE-1999-1551 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 71.8% is the estimated probability that it will be exploited in the next 30 days. That is higher than 99% of all scored CVEs.
How severe is CVE-1999-1551?
CVE-1999-1551 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.