CVE-2009-0099

Exchange Server vulnerability

CVSS

5.0

EPSS

26.2%

EPSS pct

98th

Exploited

No known

The Electronic Messaging System Microsoft Data Base (EMSMDB32) provider in Microsoft Exchange 2000 Server SP3 and Exchange Server 2003 SP2, as used in Exchange System Attendant, allows remote attackers to cause a denial of service (application outage) via a malformed MAPI command, aka "Literal Processing Vulnerability."

Affected vendor

Microsoft

Affected product

Exchange Server

CVSS vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

Weakness type (CWE)

CWE-20 — Improper Input Validation

Published

2009-02-10

Risk analysis

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

Its EPSS score of 26.2% 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-2009-0099

Confirm whether Microsoft Exchange Server is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2009-0099.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2009-0099

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2009-0099 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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