CVE-2010-3915: Unspecified vulnerability in JustSystems Ichitaro and Ichitaro Government allows remote attackers to execute a

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HIGH 9.3DOWNGRADE

CVE-2010-3915 is a high-severity flaw (CVSS 9.3) affecting ichitaro. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Unspecified vulnerability in JustSystems Ichitaro and Ichitaro Government allows remote attackers to execute arbitrary code via a crafted document, a different vulnerability than CVE-2010-3916.

Why this priority

Critical severity
EPSS top 7%: 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	6.1% (top 7%)
CISA exploited list	No
Published	2010-11-06
Last modified	2026-06-16

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

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

Am I affected?

Timeline

2010-11-06 00:00 UTCPublished CVE record published
2026-06-16 23:23 UTCUpdated Record last modified

justsystems ichitaro DOWNGRADE

Affected: all versions · 2007 · 2008 · 2009

Fixed in: no fixed release known

Safe to downgrade to: a release before 2007

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2007 (Debian / Ubuntu)

apt-cache madison ichitaro sudo apt install ichitaro=<VERSION_BEFORE_2007> sudo apt-mark hold ichitaro

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

dnf --showduplicates list ichitaro sudo dnf downgrade ichitaro-<VERSION_BEFORE_2007> 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.

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-2010-3915?

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

Is CVE-2010-3915 being exploited?

CVE-2010-3915 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-2010-3915 affect?

CVE-2010-3915 affects ichitaro. Severity is high (CVSS 9.3). Unspecified vulnerability in JustSystems Ichitaro and Ichitaro Government allows remote attackers to execute arbitrary code via a crafted document, a different vulnerability than CVE-2010-3916.

How urgent is CVE-2010-3915?

Priority 56/100. Critical severity; EPSS top 7%: very likely to be exploited

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References

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