How severe is CVE-2003-0487?

CVE-2003-0487 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2003-0487 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2003-0487?

CVE-2003-0487 affects Kerio Kerio Mailserver. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2003-0487?

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-2003-0487 published?

CVE-2003-0487 was published on 2003-08-07 and last updated on 2026-06-16.

CVE-2003-0487

CVE-2003-0487 is a high-severity vulnerability in Kerio Kerio Mailserver with a CVSS 2.0 base score of 7.5. Its EPSS exploit-prediction score of 11% places it in the 95th percentile, indicating an elevated likelihood of exploitation.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 11% (95th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Kerio Kerio Mailserver
Published: 2003-08-07
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is CVE-2003-0487?: 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.
How severe is CVE-2003-0487?: CVE-2003-0487 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2003-0487 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2003-0487?: CVE-2003-0487 affects Kerio Kerio Mailserver. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2003-0487?: 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-2003-0487 published?: CVE-2003-0487 was published on 2003-08-07 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:kerio:kerio_mailserver:5.6.3:*:*:*:*:*:*:*

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