CVE-2012-0269: Buffer overflow in JustSystems Ichitaro 2011 Sou, Ichitaro 2006 through 2011, Ichitaro Government 2006 through

This month

HIGH 9.3DOWNGRADEMITIGATEMITIGATE

CVE-2012-0269 is a high-severity flaw (CVSS 9.3) affecting ichitaro, ichitaro portable with oreplug, ichitaro viewer. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in JustSystems Ichitaro 2011 Sou, Ichitaro 2006 through 2011, Ichitaro Government 2006 through 2010, Ichitaro Portable with oreplug, Ichitaro Viewer, JUST School, JUST School 2009 and 2010, JUST Jump 4, JUST Frontier, oreplug, Shuriken Pro4, Shuriken 2007 through 2010, Shuriken Pro4 Corporate Edition, Shuriken CE/2007 through CE/2009 Corporate Edition, Shuriken 2010 Corporate Edition, Rekishimail Sengokubusho no missho, and Bakuma

Why this priority

Critical severity
EPSS top 9%: very likely to be exploited

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

Risk facts

CVSS score	9.3 (High)
EPSS exploit chance	4.2% (top 9%)
CISA exploited list	No
Weakness	CWE-119
Published	2012-04-27
Last modified	2026-06-16

Publisher (CNA): Flexera Software LLC · Vendor: justsystems

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

Am I affected?

Timeline

2012-04-27 18:55 UTCPublished CVE record published
2026-06-16 23:37 UTCUpdated Record last modified

justsystems ichitaro DOWNGRADE

Affected: 2006 · 2007 · 2008 · 2009 · 2010 · 2011

Fixed in: no fixed release known

Safe to downgrade to: a release before 2006

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2006 (Debian / Ubuntu)

apt-cache madison ichitaro sudo apt install ichitaro=<VERSION_BEFORE_2006> sudo apt-mark hold ichitaro

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

dnf --showduplicates list ichitaro sudo dnf downgrade ichitaro-<VERSION_BEFORE_2006> 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.

justsystems ichitaro portable with oreplug 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 ichitaro-portable-with-oreplug || rpm -q ichitaro-portable-with-oreplug || ichitaro-portable-with-oreplug --version

No fixed or unaffected release known

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

justsystems ichitaro viewer 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 ichitaro-viewer || rpm -q ichitaro-viewer || ichitaro-viewer --version

No fixed or unaffected release known

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

justsystems just frontier 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-frontier || rpm -q just-frontier || just-frontier --version

No fixed or unaffected release known

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

justsystems just jump DOWNGRADE

Affected: 4

Fixed in: no fixed release known

Safe to downgrade to: a release before 4

1. Check installed version

apt-cache policy just-jump || rpm -q just-jump || just-jump --version

2. No fixed release: DOWNGRADE to a release before 4 (Debian / Ubuntu)

apt-cache madison just-jump sudo apt install just-jump=<VERSION_BEFORE_4> sudo apt-mark hold just-jump

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

dnf --showduplicates list just-jump sudo dnf downgrade just-jump-<VERSION_BEFORE_4> sudo dnf versionlock add just-jump

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.

justsystems just school DOWNGRADE

Affected: all versions · 2009 · 2010

Fixed in: no fixed release known

Safe to downgrade to: a release before 2009

1. Check installed version

apt-cache policy just-school || rpm -q just-school || just-school --version

2. No fixed release: DOWNGRADE to a release before 2009 (Debian / Ubuntu)

apt-cache madison just-school sudo apt install just-school=<VERSION_BEFORE_2009> sudo apt-mark hold just-school

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

dnf --showduplicates list just-school sudo dnf downgrade just-school-<VERSION_BEFORE_2009> sudo dnf versionlock add just-school

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.

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-2012-0269?

ichitaro: downgrade or apply the listed mitigation; ichitaro portable with oreplug: mitigate or apply the listed mitigation; ichitaro viewer: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2012-0269 being exploited?

CVE-2012-0269 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-2012-0269 affect?

CVE-2012-0269 affects ichitaro, ichitaro portable with oreplug, ichitaro viewer. Severity is high (CVSS 9.3). Buffer overflow in JustSystems Ichitaro 2011 Sou, Ichitaro 2006 through 2011, Ichitaro Government 2006 through 2010, Ichitaro Portable with oreplug, Ichitaro Viewer, JUST School, JUST School 2009 and 2010, JUST Jump 4, JUST Frontier, oreplu

How urgent is CVE-2012-0269?

Priority 55/100. Critical severity; EPSS top 9%: very likely to be exploited

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References

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