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Fencer Vulns
high 7.5

CVE-2003-0487 in the critical feed json

Multiple buffer overflows in Kerio MailServer 5.6.3 allow remote authenticated users to cause a denial of service and possibly execute arbi…

published 2003-06-28 23 y ago modified 2026-06-16 4 mo ago also EUVD-2003-0481

cvss
7.5
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
11.4%
EPSS 11.4% chance of exploitation in 30 days, percentile 96%
public exploits
5
Exploit-DB

Summary

Multiple buffer overflows in Kerio MailServer 5.6.3 allow remote authenticated users to cause a denial of service and possibly execute arbitrary code via (1) a long showuser parameter in the do_subscribe module, (2) a long folder parameter in the add_acl module, (3) a long folder parameter in the list module, and (4) a long user parameter in the do_map module.

Patch / fix

Timeline

  1. First public exploit (EDB-22803)
  2. Published

Exploit prediction

11.37% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-22803 Kerio MailServer 5.6.3 do_map Module - Overflow dos, 2003-06-18
  • EDB-22802 Kerio MailServer 5.6.3 list Module - Overflow dos, 2003-06-18
  • EDB-22801 Kerio MailServer 5.6.3 add_acl Module - Overflow dos, 2003-06-18
  • EDB-22800 Kerio MailServer 5.6.3 subscribe Module - Overflow dos, 2003-06-18
  • EDB-46 Kerio MailServer 5.6.3 - Remote Buffer Overflow remote, 2003-06-27
  • securityfocus.com http://www.securityfocus.com/bid/7967 referenced PoC, tagged "exploit" by a source, unverified
  • nautopia.org http://nautopia.org/vulnerabilidades/kerio_mailserver.htm referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.