How severe is CVE-2003-1263?

CVE-2003-1263 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2003-1263 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2003-1263?

CVE-2003-1263 affects Brown Bear Software Ical. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2003-1263?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2003-1263 published?

CVE-2003-1263 was published on 2003-12-31 and last updated on 2026-06-16.

CVE-2003-1263

CVE-2003-1263 is a medium-severity vulnerability in Brown Bear Software Ical with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 8% (94th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Brown Bear Software Ical
Published: 2003-12-31
Last modified: 2026-06-16

Description

ICAL.EXE in iCal 3.7 allows remote attackers to cause a denial of service (crash) via a malformed HTTP request, possibly due to an invalid method name.

Frequently asked questions

What is CVE-2003-1263?: ICAL.EXE in iCal 3.7 allows remote attackers to cause a denial of service (crash) via a malformed HTTP request, possibly due to an invalid method name.
How severe is CVE-2003-1263?: CVE-2003-1263 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2003-1263 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2003-1263?: CVE-2003-1263 affects Brown Bear Software Ical. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2003-1263?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2003-1263 published?: CVE-2003-1263 was published on 2003-12-31 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:brown_bear_software:ical:3.7:*:*:*:*:*:*:*

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