CVE-2009-4738: Unspecified vulnerability in JustSystems Corporation ATOK 2006 through 2009 and ATOK flat-rate service, and Ju

Routine

HIGH 7.2DOWNGRADEMITIGATEDOWNGRADE

CVE-2009-4738 is a high-severity flaw (CVSS 7.2) affecting atok, atok flat-rate service, just smile. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Unspecified vulnerability in JustSystems Corporation ATOK 2006 through 2009 and ATOK flat-rate service, and Just Smile 4 with the ATOK Smile module, allows physically proximate users to bypass the screen lock and execute commands with system privileges via unknown vectors related to "launching external applications."

Why this priority

High severity

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

Risk facts

CVSS score	7.2 (High)
EPSS exploit chance	0.4% (top 66%)
CISA exploited list	No
Published	2013-01-18
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: justsystems

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

Am I affected?

Timeline

2013-01-18 23:55 UTCPublished CVE record published
2026-06-16 23:14 UTCUpdated Record last modified

justsystems atok DOWNGRADE

Affected: 2006 · 2007 · 2008 · 2009

Fixed in: no fixed release known

Safe to downgrade to: a release before 2006

1. Check installed version

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

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

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

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

dnf --showduplicates list atok sudo dnf downgrade atok-<VERSION_BEFORE_2006> sudo dnf versionlock add atok

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 atok flat-rate service 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 atok-flat-rate-service || rpm -q atok-flat-rate-service || atok-flat-rate-service --version

No fixed or unaffected release known

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

justsystems just smile 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-smile || rpm -q just-smile || just-smile --version

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

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

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

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

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-2009-4738?

atok: downgrade or apply the listed mitigation; atok flat-rate service: mitigate or apply the listed mitigation; just smile: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2009-4738 being exploited?

CVE-2009-4738 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-2009-4738 affect?

CVE-2009-4738 affects atok, atok flat-rate service, just smile. Severity is high (CVSS 7.2). Unspecified vulnerability in JustSystems Corporation ATOK 2006 through 2009 and ATOK flat-rate service, and Just Smile 4 with the ATOK Smile module, allows physically proximate users to bypass the screen lock and execute commands with syste

How urgent is CVE-2009-4738?

Priority 34/100. High severity

Related CVEs

CVE-2012-4016 MEDIUM 4.3 UPGRADE The ATOK application before 1.0.4 for Android allows remote attackers to read the learning information file, a

References

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