CVE-2020-5561: Keijiban Tsumiki v1.15 allows remote attackers to execute arbitrary OS commands via unspecified vectors.

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2020-5561 is a critical-severity flaw (CVSS 9.8) affecting keijiban tsumiki. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Keijiban Tsumiki v1.15 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: keijiban tsumiki 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

keijiban tsumiki project keijiban tsumiki DOWNGRADE

Affected: 1.15

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.15

1. Check installed version

apt-cache policy keijiban-tsumiki || rpm -q keijiban-tsumiki || keijiban-tsumiki --version

2. No fixed release: DOWNGRADE to a release before 1.15 (Debian / Ubuntu)

apt-cache madison keijiban-tsumiki sudo apt install keijiban-tsumiki=<VERSION_BEFORE_1.15> sudo apt-mark hold keijiban-tsumiki

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

dnf --showduplicates list keijiban-tsumiki sudo dnf downgrade keijiban-tsumiki-<VERSION_BEFORE_1.15> sudo dnf versionlock add keijiban-tsumiki

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-2020-5561?

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

Is CVE-2020-5561 being exploited?

CVE-2020-5561 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-2020-5561 affect?

CVE-2020-5561 affects keijiban tsumiki. Severity is critical (CVSS 9.8). Keijiban Tsumiki v1.15 allows remote attackers to execute arbitrary OS commands via unspecified vectors.

How urgent is CVE-2020-5561?

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

References

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