CVE-2004-2005: Buffer overflow in Eudora for Windows 5.2.1, 6.0.3, and 6.1 allows remote attackers to execute arbitrary code

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MEDIUM 5.1DOWNGRADE

CVE-2004-2005 is a medium-severity flaw (CVSS 5.1) affecting eudora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in Eudora for Windows 5.2.1, 6.0.3, and 6.1 allows remote attackers to execute arbitrary code via an e-mail with (1) a link to a long URL to the C drive or (2) a long attachment name.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.1 (Medium)
EPSS exploit chance	3.5% (top 11%)
CISA exploited list	No
Published	2004-05-06
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: qualcomm

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2004-05-06 04:00 UTCPublished CVE record published
2026-06-16 22:08 UTCUpdated Record last modified

qualcomm eudora DOWNGRADE

Affected: 5.2.1 · 6.0 · 6.0.1 · 6.0.3 · 6.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.2.1

1. Check installed version

apt-cache policy eudora || rpm -q eudora || eudora --version

2. No fixed release: DOWNGRADE to a release before 5.2.1 (Debian / Ubuntu)

apt-cache madison eudora sudo apt install eudora=<VERSION_BEFORE_5.2.1> sudo apt-mark hold eudora

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list eudora sudo dnf downgrade eudora-<VERSION_BEFORE_5.2.1> sudo dnf versionlock add eudora

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Qualcomm Eudora 5.2.1/6.x - Embedded Hyperlink Buffer Overrun

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2004-2005?

eudora: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2004-2005 being exploited?

CVE-2004-2005 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2004-2005 affect?

CVE-2004-2005 affects eudora. Severity is medium (CVSS 5.1). Buffer overflow in Eudora for Windows 5.2.1, 6.0.3, and 6.1 allows remote attackers to execute arbitrary code via an e-mail with (1) a link to a long URL to the C drive or (2) a long attachment name.

How urgent is CVE-2004-2005?

Priority 45/100. Public exploit reference

Software pages

Windows vulnerabilities · Qualcomm vulnerabilities

Related CVEs

CVE-2007-3166 MEDIUM 6.8 DOWNGRADE Buffer overflow in Qualcomm Eudora 7.1.0.9 allows user-assisted, remote IMAP servers to execute arbitrary code
CVE-2007-2770 HIGH 9.3 DOWNGRADE Stack-based buffer overflow in Eudora 7.1 allows user-assisted, remote SMTP servers to execute arbitrary code
CVE-2004-2649 MEDIUM 5.8 DOWNGRADE Eudora 6.1.0.6 allows remote attackers to obfuscate URLs displayed in the status bar by inserting a large numb
CVE-2004-1944 MEDIUM 5.0 DOWNGRADE Eudora 6.1 and 6.0.3 for Windows allows remote attackers to cause a denial of service (crash) via a deeply nes
CVE-2004-1521 MEDIUM 5.0 DOWNGRADE Eudora 6.2.0.14 does not issue a warning when a user forwards an e-mail message that contains base64 or quoted

References

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