Is CVE-1999-1557 actively exploited?

A proof-of-concept exploit is publicly available for CVE-1999-1557, but active exploitation has not been confirmed.

Can CVE-1999-1557 be exploited remotely?

Yes. CVE-1999-1557 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-1999-1557?

CVE-1999-1557 has a CVSS score of 5.0 (MEDIUM).

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MEDIUMPOC

CVE-1999-1557

NVD-CWE-OtherPublished: May 2, 2005· Updated: Jun 16, 2026

5.0

CVSS v3.1

Official Description

Buffer overflow in the login functions in IMAP server (imapd) in Ipswitch IMail 5.0 and earlier allows remote attackers to cause a denial of service and possibly execute arbitrary code via (1) a long user name or (2) a long password.

NVD Source

Technical Analysis

CVE-1999-1557 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A proof-of-concept (PoC) exploit exists for CVE-1999-1557. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.