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CVE-2020-6638

19
FAUCET Score

CVE-2020-6638 is a high-severity vulnerability (CVSS 7.5) affecting Grin through version 2.1.1, stemming from insufficient validation (CWE-20). This flaw allows an unauthenticated attacker to remotely cause a denial of service, requiring no user interaction. While the vulnerability has a high risk score, there is currently no evidence of active exploitation, public exploit code, or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.1.1CPE matchmatch criteria
cpe:2.3:a:grin:grin:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.32%
Probability of exploitation in next 30 days
EPSS Percentile
68.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0132 is in the 48th percentile among its peer group of 51,485 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
rustpatch availablevia ghsa
Product: grinFixed in: 3.0.0

Vendor Advisories (1)

rustGHSA-7w6p-rwhg-7h3ghigh

Grin Insufficient Validation

May 24, 2022

References

github.com / mimblewimble/grin/compare/v2.1.1...v3.0.0
Third Party Advisory
github.com / mimblewimble/grin-security/blob/master/CVEs/CVE-2020-6638.md
ExploitPatchTechnical DescriptionThird Party Advisory