CVE-2003-1177

CVE-2003-1177 is a high-severity vulnerability in Atrium Software Mercur Mailserver with a CVSS 2.0 base score of 7.5. Its EPSS exploit-prediction score of 13% places it in the 96th percentile, indicating an elevated likelihood of exploitation.

Key facts

Description

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.

Frequently asked questions

What is CVE-2003-1177?
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.
How severe is CVE-2003-1177?
CVE-2003-1177 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2003-1177 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 13% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2003-1177?
CVE-2003-1177 primarily affects Atrium Software Mercur Mailserver. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2003-1177?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2003-1177 published?
CVE-2003-1177 was published on 2003-12-31 and last updated on 2026-06-16.

References

Affected products (8)

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