How severe is CVE-2007-0039?

CVE-2007-0039 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2007-0039 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 45% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2007-0039?

CVE-2007-0039 primarily affects Microsoft Exchange Server. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2007-0039?

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-2007-0039 published?

CVE-2007-0039 was published on 2007-05-08 and last updated on 2026-06-16.

CVE-2007-0039

CVE-2007-0039 is a high-severity vulnerability in Microsoft Exchange Server with a CVSS 2.0 base score of 7.8. Its EPSS exploit-prediction score of 45% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-476.

Key facts

Severity: High (CVSS 2.0 base score 7.8)
EPSS exploit prediction: 45% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Microsoft Exchange Server
Published: 2007-05-08
Last modified: 2026-06-16

Description

The Exchange Collaboration Data Objects (EXCDO) functionality in Microsoft Exchange Server 2000 SP3, 2003 SP1 and SP2, and 2007 allows remote attackers to cause a denial of service (crash) via an Internet Calendar (iCal) file containing multiple X-MICROSOFT-CDO-MODPROPS (MODPROPS) properties in which the second MODPROPS is longer than the first, which triggers a NULL pointer dereference and an unhandled exception.

Frequently asked questions

What is CVE-2007-0039?: The Exchange Collaboration Data Objects (EXCDO) functionality in Microsoft Exchange Server 2000 SP3, 2003 SP1 and SP2, and 2007 allows remote attackers to cause a denial of service (crash) via an Internet Calendar (iCal) file containing multiple X-MICROSOFT-CDO-MODPROPS (MODPROPS) properties in which the second MODPROPS is longer than the first, which triggers a NULL pointer dereference and an unhandled exception.
How severe is CVE-2007-0039?: CVE-2007-0039 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-2007-0039 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 45% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2007-0039?: CVE-2007-0039 primarily affects Microsoft Exchange Server. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2007-0039?: 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-2007-0039 published?: CVE-2007-0039 was published on 2007-05-08 and last updated on 2026-06-16.

References

Affected products (4)

cpe:2.3:a:microsoft:exchange_server:2000:sp3:*:*:*:*:*:*
cpe:2.3:a:microsoft:exchange_server:2003:sp1:*:*:*:*:*:*
cpe:2.3:a:microsoft:exchange_server:2003:sp2:*:*:*:*:*:*
cpe:2.3:a:microsoft:exchange_server:2007:-:*:*:*:*:*:*

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