THREATPORT/VULNERABILITY/CVE-2004-0840
HIGH SEVERITY

CVE-2004-0840

Exchange Server vulnerability

CVSS
10.0
EPSS
30.3%
EPSS pct
98th
Exploited
No known
The SMTP (Simple Mail Transfer Protocol) component of Microsoft Windows XP 64-bit Edition, Windows Server 2003, Windows Server 2003 64-bit Edition, and the Exchange Routing Engine component of Exchange Server 2003, allows remote attackers to execute arbitrary code via a malicious DNS response message containing length values that are not properly validated.
Affected vendor
Microsoft
Affected product
Exchange Server
CVSS vector
AV:N/AC:L/Au:N/C:C/I:C/A:C
Weakness type (CWE)
  • CWE-20 — Improper Input Validation
Published
2004-11-03

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 confidentiality, complete impact to integrity, complete impact to availability.

Its EPSS score of 30.3% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 98% of all scored CVEs.

Check your external exposure to CVE-2004-0840

  • Confirm whether Microsoft Exchange Server is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2004-0840.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2004-0840

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2004-0840 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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