CVE-2007-0039Exchange Server NULL Pointer Dereference
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…
Published May 8, 2007 · Updated Apr 22, 2026
Key Facts
Patch in the next maintenance window- CVE-2007-0039 is a high-severity vulnerability (CVSS 7.8 v2) affecting Exchange Server (Microsoft).
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 45% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
Scores
CVSS v2
7.8
AV:N/AC:L/Au:N/C:N/I:N/A:C
EPSS (30-day exploit likelihood)
45%
Higher than 98.7% of all scored CVEs
Exploit maturity
None known
ATLAS score
41/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
None known
Public exploit code
0
Proof-of-concept links
In-the-wild evidence
0
Reports of active use
Advisories And Exploit References
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.
Affected Products
4 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Exchange ServerMicrosoft | 2000-sp3, 2003-sp1, 2003-sp2, 2007 | n/a |
Timeline
Publicly disclosed
May 8, 2007
Last updated
Apr 22, 2026
Weakness Type
- CWE-476 NULL Pointer Dereference
References
- advisory20070509 Exchange Calendar MODPROPS Denial of Service (CVE-2007-0039)
- advisory25183
- advisoryexchange-ical-dos(33888)
- advisoryoval:org.mitre.oval:def:1593
- advisory20070508 Exchange Calendar MODPROPS Denial of Service (CVE-2007-0039)
FAQ
Common Questions.
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 MODPRO…
Affected: Exchange Server (Microsoft) versions 2000-sp3, 2003-sp1, 2003-sp2, 2007. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
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