CVE-2004-1521: Eudora 6.2.0.14 does not issue a warning when a user forwards an e-mail message that contains base64 or quoted

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MEDIUM 5.0DOWNGRADE

CVE-2004-1521 is a medium-severity flaw (CVSS 5.0) affecting eudora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Eudora 6.2.0.14 does not issue a warning when a user forwards an e-mail message that contains base64 or quoted-printable encoded attachments, which makes it easier for remote attackers to read arbitrary files via spoofed "Converted" headers.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.7% (top 22%)
CISA exploited list	No
Published	2004-12-31
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

2004-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:07 UTCUpdated Record last modified

qualcomm eudora DOWNGRADE

Affected: 6.2.0.14

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.2.0.14

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 6.2.0.14 (Debian / Ubuntu)

apt-cache madison eudora sudo apt install eudora=<VERSION_BEFORE_6.2.0.14> sudo apt-mark hold eudora

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

dnf --showduplicates list eudora sudo dnf downgrade eudora-<VERSION_BEFORE_6.2.0.14> 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: Eudora 6.0.3 (Windows) - Attachment Spoofing

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-2004-1521?

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

Is CVE-2004-1521 being exploited?

CVE-2004-1521 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-2004-1521 affect?

CVE-2004-1521 affects eudora. Severity is medium (CVSS 5.0). Eudora 6.2.0.14 does not issue a warning when a user forwards an e-mail message that contains base64 or quoted-printable encoded attachments, which makes it easier for remote attackers to read arbitrary files via spoofed "Converted" headers

How urgent is CVE-2004-1521?

Priority 42/100. Public exploit reference

Software pages

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-2004-2005 MEDIUM 5.1 DOWNGRADE Buffer overflow in Eudora for Windows 5.2.1, 6.0.3, and 6.1 allows remote attackers to execute arbitrary code
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

References

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