CVE-2014-2003: JustSystems JUST Online Update, as used in Ichitaro through 2014 and other products, does not properly validat

Q: How do I fix CVE-2014-2003?

ichitaro: upgrade to newer than 2014; just online update: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2014-2003 being exploited?

CVE-2014-2003 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-2014-2003 affect?

CVE-2014-2003 affects ichitaro, just online update. Severity is high (CVSS 7.6). JustSystems JUST Online Update, as used in Ichitaro through 2014 and other products, does not properly validate signatures of update modules, which allows remote attackers to spoof modules and execute arbitrary code via a crafted signature.

This month

HIGH 7.6UPGRADEMITIGATE

CVE-2014-2003 is a high-severity flaw (CVSS 7.6) affecting ichitaro, just online update. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

JustSystems JUST Online Update, as used in Ichitaro through 2014 and other products, does not properly validate signatures of update modules, which allows remote attackers to spoof modules and execute arbitrary code via a crafted signature.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.6 (High)
EPSS exploit chance	3.6% (top 11%)
CISA exploited list	No
Weakness	CWE-20
Published	2014-06-16
Last modified	2026-06-17

Publisher (CNA): JPCERT/CC · Vendor: justsystems

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2014-06-16 14:55 UTCPublished CVE record published
2026-06-17 00:05 UTCUpdated Record last modified

justsystems ichitaro UPGRADE

Affected: <= 2014 · 10 · 11 · 12 · 13 · 2004 · 2005 · 2006

Fixed in: newer than 2014

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 2014 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ichitaro

Note

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

justsystems just online update MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy just-online-update || rpm -q just-online-update || just-online-update --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

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-2014-2003?

ichitaro: upgrade to newer than 2014; just online update: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2014-2003 being exploited?

CVE-2014-2003 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-2014-2003 affect?

CVE-2014-2003 affects ichitaro, just online update. Severity is high (CVSS 7.6). JustSystems JUST Online Update, as used in Ichitaro through 2014 and other products, does not properly validate signatures of update modules, which allows remote attackers to spoof modules and execute arbitrary code via a crafted signature.

How urgent is CVE-2014-2003?

Priority 49/100. High severity

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References

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