CVE-2009-1054: Unspecified vulnerability in JustSystems Ichitaro 13, 2004 through 2008, Lite2, and Ichitaro viewer 5.1.5.0 an

Q: How do I fix CVE-2009-1054?

ichitaro: downgrade or apply the listed mitigation; ichitaro viewer: upgrade to newer than 5.1.5.0. Exact commands for each OS are on this page.

Q: Is CVE-2009-1054 being exploited?

CVE-2009-1054 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2009-1054 affect?

CVE-2009-1054 affects ichitaro, ichitaro viewer. Severity is high (CVSS 9.3). Unspecified vulnerability in JustSystems Ichitaro 13, 2004 through 2008, Lite2, and Ichitaro viewer 5.1.5.0 and earlier allows remote attackers to execute arbitrary code via a crafted file, as exploited in the wild by Trojan.Tarodrop.H in M

Q: How urgent is CVE-2009-1054?

Priority 55/100. Critical severity; EPSS top 10%: very likely to be exploited

This month

HIGH 9.3DOWNGRADEUPGRADE

CVE-2009-1054 is a high-severity flaw (CVSS 9.3) affecting ichitaro, ichitaro viewer. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Unspecified vulnerability in JustSystems Ichitaro 13, 2004 through 2008, Lite2, and Ichitaro viewer 5.1.5.0 and earlier allows remote attackers to execute arbitrary code via a crafted file, as exploited in the wild by Trojan.Tarodrop.H in March 2009.

Why this priority

Critical severity
EPSS top 10%: very likely to be exploited

A fixed release or distro patch exists.

Risk facts

CVSS score	9.3 (High)
EPSS exploit chance	3.9% (top 10%)
CISA exploited list	No
Published	2009-03-24
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: ichitaro

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

Am I affected?

Timeline

2009-03-24 14:30 UTCPublished CVE record published
2026-06-16 23:06 UTCUpdated Record last modified

ichitaro ichitaro DOWNGRADE

Affected: 13 · 2004 · 2005 · 2006 · 2007 · 2008 · lite2

Fixed in: no fixed release known

Safe to downgrade to: a release before 13

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 13 (Debian / Ubuntu)

apt-cache madison ichitaro sudo apt install ichitaro=<VERSION_BEFORE_13> sudo apt-mark hold ichitaro

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

dnf --showduplicates list ichitaro sudo dnf downgrade ichitaro-<VERSION_BEFORE_13> sudo dnf versionlock add ichitaro

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.

ichitaro ichitaro viewer UPGRADE

Affected: <= 5.1.5.0

Fixed in: newer than 5.1.5.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ichitaro-viewer || rpm -q ichitaro-viewer || ichitaro-viewer --version

2. UPGRADE to newer than 5.1.5.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ichitaro-viewer

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ichitaro-viewer

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2009-1054?

ichitaro: downgrade or apply the listed mitigation; ichitaro viewer: upgrade to newer than 5.1.5.0. Exact commands for each OS are on this page.

Is CVE-2009-1054 being exploited?

CVE-2009-1054 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-2009-1054 affect?

CVE-2009-1054 affects ichitaro, ichitaro viewer. Severity is high (CVSS 9.3). Unspecified vulnerability in JustSystems Ichitaro 13, 2004 through 2008, Lite2, and Ichitaro viewer 5.1.5.0 and earlier allows remote attackers to execute arbitrary code via a crafted file, as exploited in the wild by Trojan.Tarodrop.H in M

How urgent is CVE-2009-1054?

Priority 55/100. Critical severity; EPSS top 10%: very likely to be exploited

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References

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