CVE-2020-12439: Grin before 3.1.0 allows attackers to adversely affect availability of data on a Mimblewimble blockchain.

Q: How do I fix CVE-2020-12439?

grin: upgrade to 3.1.0. Exact commands for each OS are on this page.

Q: Is CVE-2020-12439 being exploited?

CVE-2020-12439 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-12439 affect?

CVE-2020-12439 affects grin. Severity is medium (CVSS 5.3). Grin before 3.1.0 allows attackers to adversely affect availability of data on a Mimblewimble blockchain.

Q: How urgent is CVE-2020-12439?

Priority 42/100. Remotely exploitable, no login, no user action

This month

MEDIUM 5.3REMOTEUPGRADE

CVE-2020-12439 is a medium-severity flaw (CVSS 5.3) affecting grin. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Grin before 3.1.0 allows attackers to adversely affect availability of data on a Mimblewimble blockchain.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.6% (top 25%)
CISA exploited list	No
Weakness	CWE-404
Published	2020-05-05
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: grin

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

Am I affected?

Timeline

2020-05-05 22:15 UTCPublished CVE record published
2026-06-17 02:51 UTCUpdated Record last modified

grin grin UPGRADE

Affected: < 3.1.0

Fixed in: 3.1.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 3.1.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade grin

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade grin

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2020-12439?

grin: upgrade to 3.1.0. Exact commands for each OS are on this page.

Is CVE-2020-12439 being exploited?

CVE-2020-12439 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-2020-12439 affect?

CVE-2020-12439 affects grin. Severity is medium (CVSS 5.3). Grin before 3.1.0 allows attackers to adversely affect availability of data on a Mimblewimble blockchain.

How urgent is CVE-2020-12439?

Priority 42/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2020-6638 HIGH 7.5 UPGRADE Grin through 2.1.1 has Insufficient Validation.
CVE-2020-15899 HIGH 7.5 UPGRADE Grin 3.0.0 before 4.0.0 has insufficient validation of data related to Mimblewimble.
CVE-2019-9195 CRITICAL 9.8 UPGRADE util/src/zip.rs in Grin before 1.0.2 mishandles suspicious files

References

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