CVE-2014-5323: The Yuko Yuko (aka jp.co.yukoyuko.android.yukoyuko_android) application 1.0.5 and earlier for Android does not

Routine

MEDIUM 5.4DOWNGRADE

CVE-2014-5323 is a medium-severity flaw (CVSS 5.4) affecting yuko yuko. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Yuko Yuko (aka jp.co.yukoyuko.android.yukoyuko_android) application 1.0.5 and earlier for Android does not verify X.509 certificates from SSL servers, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	5.4 (Medium)
EPSS exploit chance	0.2% (top 84%)
CISA exploited list	No
Weakness	CWE-310
Published	2014-09-24
Last modified	2026-06-17

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

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

Am I affected?

Timeline

2014-09-24 00:55 UTCPublished CVE record published
2026-06-17 00:11 UTCUpdated Record last modified

yukoyuko yuko yuko DOWNGRADE

Affected: 1.0.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.5

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0.5 (Debian / Ubuntu)

apt-cache madison -yuko-yuko sudo apt install -yuko-yuko=<VERSION_BEFORE_1.0.5> sudo apt-mark hold -yuko-yuko

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

dnf --showduplicates list -yuko-yuko sudo dnf downgrade -yuko-yuko-<VERSION_BEFORE_1.0.5> sudo dnf versionlock add -yuko-yuko

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-2014-5323?

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

Is CVE-2014-5323 being exploited?

CVE-2014-5323 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-2014-5323 affect?

CVE-2014-5323 affects yuko yuko. Severity is medium (CVSS 5.4). The Yuko Yuko (aka jp.co.yukoyuko.android.yukoyuko_android) application 1.0.5 and earlier for Android does not verify X.509 certificates from SSL servers, which allows man-in-the-middle attackers to spoof servers and obtain sensitive inform

How urgent is CVE-2014-5323?

Priority 23/100. No elevated risk signals yet.

Software pages

Android vulnerabilities

References

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