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CVE-2021-3779

23
FAUCET Score

CVE-2021-3779 describes a vulnerability in ruby-mysql versions prior to 2.10.0, where a malicious MySQL server could request and retrieve local file content from a connecting client without explicit user authorization. This medium-severity vulnerability (CVSS 6.5) has a network attack vector and low complexity, potentially leading to high confidentiality impact by allowing unauthorized data exfiltration. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.10.0CPE matchmatch criteria
cpe:2.3:a:ruby-mysql_project:ruby-mysql:*:*:*:*:*:ruby:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.13%
Probability of exploitation in next 30 days
EPSS Percentile
63.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0113 is in the 76th percentile among its peer group of 26,219 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 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 (1)

rubygemspatch availablevia ghsa
Product: ruby-mysqlFixed in: 2.10.0

Vendor Advisories (1)

rubygemsGHSA-73pr-g6jj-5hc9medium

Externally Controlled Reference to a Resource in Another Sphere in ruby-mysql

Jun 29, 2022

References

rapid7.com / blog/post/2022/06/28/cve-2021-3779-ruby-mysql-gem-client-file-read-fixed
ExploitMitigationThird Party Advisory