Is CVE-2003-1177 in the CISA KEV catalog?

No. CVE-2003-1177 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2003-1177?

CVE-2003-1177 has a CVSS v2 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2003-1177?

CVE-2003-1177 has an EPSS score of 12.93% (96th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2003-1177

HIGHEPSS 96th pctl

7.5

CVSS v2

NVD

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.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

12.93%probability of exploitation in 30 days

96thpercentile

Very high risk: more likely to be exploited than 96% of all known CVEs.

References

http://archives.neohapsis.com/archives/fulldisclosure/2003-q4/1459.html
http://secunia.com/advisories/10038
http://www.atrium-software.com/mail%20server/pub/mcr42sp3a.html
http://www.osvdb.org/2688
http://www.securiteam.com/windowsntfocus/6U00N1P8KC.html
http://www.securityfocus.com/bid/8861
http://www.securityfocus.com/bid/8889
https://exchange.xforce.ibmcloud.com/vulnerabilities/13468

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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.