Is CVE-2004-0740 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2004-0740, but active exploitation has not been confirmed.

Can CVE-2004-0740 be exploited remotely?

Yes. CVE-2004-0740 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2004-0740?

CVE-2004-0740 has a CVSS score of 5.0 (MEDIUM).

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MEDIUMPOC

CVE-2004-0740

NVD-CWE-OtherPublished: July 27, 2004· Updated: Jun 16, 2026

5.0

CVSS v3.1

Official Description

The HTTP server in Lexmark T522 and possibly other models allows remote attackers to cause a denial of service (server crash, reload, or hang) via an HTTP header with a long Host field, possibly triggering a buffer overflow.

NVD Source

Technical Analysis

CVE-2004-0740 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A proof-of-concept (PoC) exploit exists for CVE-2004-0740. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.