CVE-2020-6638: Grin through 2.1.1 has Insufficient Validation.

Q: How do I fix CVE-2020-6638?

grin: upgrade to newer than 2.1.1. Exact commands for each OS are on this page.

Q: Is CVE-2020-6638 being exploited?

CVE-2020-6638 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-2020-6638 affect?

CVE-2020-6638 affects grin. Severity is high (CVSS 7.5). Grin through 2.1.1 has Insufficient Validation.

Q: How urgent is CVE-2020-6638?

Priority 54/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2020-6638 is a high-severity flaw (CVSS 7.5) affecting grin. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Grin through 2.1.1 has Insufficient Validation.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-20
Published	2020-01-21
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

2020-01-21 20:15 UTCPublished CVE record published
2026-06-17 03:23 UTCUpdated Record last modified

grin grin UPGRADE

Affected: <= 2.1.1

Fixed in: newer than 2.1.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 2.1.1 (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-2020-6638?

grin: upgrade to newer than 2.1.1. Exact commands for each OS are on this page.

Is CVE-2020-6638 being exploited?

CVE-2020-6638 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-2020-6638 affect?

CVE-2020-6638 affects grin. Severity is high (CVSS 7.5). Grin through 2.1.1 has Insufficient Validation.

How urgent is CVE-2020-6638?

Priority 54/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2020-15899 HIGH 7.5 UPGRADE Grin 3.0.0 before 4.0.0 has insufficient validation of data related to Mimblewimble.
CVE-2020-12439 MEDIUM 5.3 UPGRADE Grin before 3.1.0 allows attackers to adversely affect availability of data on a Mimblewimble blockchain.
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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