THREATPORT/VULNERABILITY/CVE-2007-0039
HIGH SEVERITY

CVE-2007-0039

Exchange Server vulnerability

CVSS
7.8
EPSS
44.6%
EPSS pct
99th
Exploited
No known
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 vendor
Microsoft
Affected product
Exchange Server
CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:C
Weakness type (CWE)
  • CWE-476 — NULL Pointer Dereference
Published
2007-05-08

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no authentication. Successful exploitation leads to complete impact to availability.

Its EPSS score of 44.6% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it among the most exploited CVEs currently tracked.

Check your external exposure to CVE-2007-0039

  • Confirm whether Microsoft Exchange Server is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2007-0039.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2007-0039

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2007-0039 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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