CVE-2003-0301

Outlook Express vulnerability

CVSS

5.0

EPSS

6.0%

EPSS pct

93th

Exploited

No known

The IMAP Client for Outlook Express 6.00.2800.1106 allows remote malicious IMAP servers to cause a denial of service (crash) via certain large literal size values that cause either integer signedness errors or integer overflow errors.

Affected vendor

Microsoft

Affected product

Outlook Express

CVSS vector

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

Published

2003-06-16

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 6.0% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 93% of all scored CVEs.

Check your external exposure to CVE-2003-0301

Confirm whether Microsoft Outlook Express is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2003-0301.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2003-0301

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2003-0301 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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