CVE-2021-30219: samurai 1.2 has a NULL pointer dereference in printstatus() function in build.c via a crafted build file.

Routine

MEDIUM 5.5DOWNGRADE

CVE-2021-30219 is a medium-severity flaw (CVSS 5.5) affecting samurai. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

samurai 1.2 has a NULL pointer dereference in printstatus() function in build.c via a crafted build file.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.7% (top 45%)
CISA exploited list	No
Weakness	CWE-476
Published	2021-04-29
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: samurai project

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

Am I affected?

Timeline

2021-04-29 15:15 UTCPublished CVE record published
2026-06-17 03:49 UTCUpdated Record last modified

samurai project samurai DOWNGRADE

Affected: 1.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.2 (Debian / Ubuntu)

apt-cache madison samurai sudo apt install samurai=<VERSION_BEFORE_1.2> sudo apt-mark hold samurai

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

dnf --showduplicates list samurai sudo dnf downgrade samurai-<VERSION_BEFORE_1.2> sudo dnf versionlock add samurai

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-2021-30219?

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

Is CVE-2021-30219 being exploited?

CVE-2021-30219 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-2021-30219 affect?

CVE-2021-30219 affects samurai. Severity is medium (CVSS 5.5). samurai 1.2 has a NULL pointer dereference in printstatus() function in build.c via a crafted build file.

How urgent is CVE-2021-30219?

Priority 38/100. Public exploit reference

Related CVEs

CVE-2021-30218 MEDIUM 5.5 DOWNGRADE samurai 1.2 has a NULL pointer dereference in writefile() in util.c via a crafted build file.
CVE-2019-19795 HIGH 7.8 DOWNGRADE samurai 0.7 has a heap-based buffer overflow in canonpath in util.c via a crafted build file.

References

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