CVE-2020-5556: Shihonkanri Plus GOOUT Ver1.5.8 and Ver2.2.10 allows remote attackers to execute arbitrary OS commands via uns

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2020-5556 is a critical-severity flaw (CVSS 9.8) affecting shihonkanri plus goout. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Shihonkanri Plus GOOUT Ver1.5.8 and Ver2.2.10 allows remote attackers to execute arbitrary OS commands via unspecified vectors.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.3% (top 17%)
CISA exploited list	No
Weakness	CWE-78
Published	2020-03-25
Last modified	2026-06-17

Publisher (CNA): JPCERT/CC · Vendor: shihonkanri plus goout project

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

Am I affected?

Timeline

2020-03-25 02:15 UTCPublished CVE record published
2026-06-17 03:21 UTCUpdated Record last modified

shihonkanri plus goout project shihonkanri plus goout DOWNGRADE

Affected: 1.5.8 · 2.2.10

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.5.8

1. Check installed version

apt-cache policy shihonkanri-plus-goout || rpm -q shihonkanri-plus-goout || shihonkanri-plus-goout --version

2. No fixed release: DOWNGRADE to a release before 1.5.8 (Debian / Ubuntu)

apt-cache madison shihonkanri-plus-goout sudo apt install shihonkanri-plus-goout=<VERSION_BEFORE_1.5.8> sudo apt-mark hold shihonkanri-plus-goout

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

dnf --showduplicates list shihonkanri-plus-goout sudo dnf downgrade shihonkanri-plus-goout-<VERSION_BEFORE_1.5.8> sudo dnf versionlock add shihonkanri-plus-goout

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-2020-5556?

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

Is CVE-2020-5556 being exploited?

CVE-2020-5556 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-2020-5556 affect?

CVE-2020-5556 affects shihonkanri plus goout. Severity is critical (CVSS 9.8). Shihonkanri Plus GOOUT Ver1.5.8 and Ver2.2.10 allows remote attackers to execute arbitrary OS commands via unspecified vectors.

How urgent is CVE-2020-5556?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2020-5555 CRITICAL 9.1 DOWNGRADE Shihonkanri Plus GOOUT Ver1.5.8 and Ver2.2.10 allows remote attackers to read and write data of the files plac
CVE-2020-5554 CRITICAL 9.1 DOWNGRADE Directory traversal vulnerability in Shihonkanri Plus GOOUT Ver1.5.8 and Ver2.2.10 allows remote attackers to

References

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