CVE-2004-0224: Multiple buffer overflows in (1) iso2022jp.c or (2) shiftjis.c for Courier-IMAP before 3.0.0, Courier before 0

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HIGH 7.5WATCHLISTDOWNGRADEDOWNGRADEDOWNGRADE

CVE-2004-0224 is a high-severity flaw (CVSS 7.5) affecting courier mta, sqwebmail, courier-imap. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple buffer overflows in (1) iso2022jp.c or (2) shiftjis.c for Courier-IMAP before 3.0.0, Courier before 0.45, and SqWebMail before 4.0.0 may allow remote attackers to execute arbitrary code "when Unicode character is out of BMP range."

Why this priority

High severity
On your watchlist

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	3.3% (top 12%)
CISA exploited list	No
Published	2004-04-15
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: double precision incorporated · gentoo · inter7

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

Am I affected?

Timeline

2004-04-15 04:00 UTCPublished CVE record published
2026-06-16 22:05 UTCUpdated Record last modified

double precision incorporated courier mta DOWNGRADE

Affected: 0.43 · 0.43.1 · 0.43.2 · 0.44 · 0.44.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.43

1. Check installed version

apt-cache policy courier-mta || rpm -q courier-mta || courier-mta --version

2. No fixed release: DOWNGRADE to a release before 0.43 (Debian / Ubuntu)

apt-cache madison courier-mta sudo apt install courier-mta=<VERSION_BEFORE_0.43> sudo apt-mark hold courier-mta

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

dnf --showduplicates list courier-mta sudo dnf downgrade courier-mta-<VERSION_BEFORE_0.43> sudo dnf versionlock add courier-mta

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.

double precision incorporated sqwebmail DOWNGRADE

Affected: 3.5.2 · 3.5.3 · 3.6.1 · 3.6.2 · 3.6_.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.5.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.5.2 (Debian / Ubuntu)

apt-cache madison sqwebmail sudo apt install sqwebmail=<VERSION_BEFORE_3.5.2> sudo apt-mark hold sqwebmail

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

dnf --showduplicates list sqwebmail sudo dnf downgrade sqwebmail-<VERSION_BEFORE_3.5.2> sudo dnf versionlock add sqwebmail

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.

inter7 courier-imap DOWNGRADE

Affected: 1.6 · 1.7 · 2.0.0 · 2.1 · 2.1.1 · 2.1.2 · 2.2.0 · 2.2.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.6

1. Check installed version

apt-cache policy courier-imap || rpm -q courier-imap || courier-imap --version

2. No fixed release: DOWNGRADE to a release before 1.6 (Debian / Ubuntu)

apt-cache madison courier-imap sudo apt install courier-imap=<VERSION_BEFORE_1.6> sudo apt-mark hold courier-imap

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

dnf --showduplicates list courier-imap sudo dnf downgrade courier-imap-<VERSION_BEFORE_1.6> sudo dnf versionlock add courier-imap

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.

gentoo linux MITIGATE

Affected: 1.4 · 1.4 rc1 · 1.4 rc2 · 1.4 rc3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.4

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2004-0224?

courier mta: downgrade or apply the listed mitigation; sqwebmail: downgrade or apply the listed mitigation; courier-imap: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2004-0224 being exploited?

CVE-2004-0224 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-2004-0224 affect?

CVE-2004-0224 affects courier mta, sqwebmail, courier-imap. Severity is high (CVSS 7.5). Multiple buffer overflows in (1) iso2022jp.c or (2) shiftjis.c for Courier-IMAP before 3.0.0, Courier before 0.45, and SqWebMail before 4.0.0 may allow remote attackers to execute arbitrary code "when Unicode character is out of BMP range."

How urgent is CVE-2004-0224?

Priority 53/100. High severity; On your watchlist

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References

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