THREATPORT/VULNERABILITY/CVE-2003-1177
HIGH SEVERITY

CVE-2003-1177

Mercur Mailserver vulnerability

CVSS
7.5
EPSS
12.9%
EPSS pct
96th
Exploited
No known
Buffer overflow in the base64 decoder in MERCUR Mailserver 4.2 before SP3a allows remote attackers to cause a denial of service and possibly execute arbitrary code via a long (1) AUTH command to the POP3 server or (2) AUTHENTICATE command to the IMAP server.
Affected vendor
Atrium Software
Affected product
Mercur Mailserver
CVSS vector
AV:N/AC:L/Au:N/C:P/I:P/A:P
Published
2003-12-31

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no authentication. Successful exploitation leads to partial impact to confidentiality, partial impact to integrity, partial impact to availability.

Its EPSS score of 12.9% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 96% of all scored CVEs.

Check your external exposure to CVE-2003-1177

  • Confirm whether Atrium Software Mercur Mailserver is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2003-1177.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2003-1177

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2003-1177 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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