CVE-2021-3779Network attack vector

Arbitrary file disclosure via unsolicited local-file request

Published Jun 28, 2022 · Updated Sep 17, 2024

Arbitrary file disclosure in ruby-mysql before 2.10.0 allows remote attackers controlling a MySQL server to read client files. Protocol#get_result treats any response packet with a nil field count as a LOAD DATA LOCAL INFILE request and opens the server-supplied filename without checking that local-file transfer was enabled or initiated. The client must connect to the malicious server and issue a query; disclosed content is limited to files readable by the client process.

CVSS severity6.5
Medium
EPSS probability1.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file disclosure in ruby-mysql before 2.10.0 allows remote attackers controlling a MySQL server to read client files. Protocol#get_result treats any response packet with a nil field count as a LOAD DATA LOCAL INFILE request and opens the server-supplied filename without checking that local-file transfer was enabled or initiated. The client must connect to the malicious server and issue a query; disclosed content is limited to files readable by the client process.

The record

CVE
CVE-2021-3779
Published
Jun 28, 2022
Updated
Sep 17, 2024
Vendor
Tomita Masahiro
Product
ruby-mysql
Classifications
CWE-610, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 28, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.9.14 <=2.9.14

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Tomita Masahiro · ruby-mysqlversion=2.9.14 <=2.9.14

Published CVSS scores

6.5GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:P/I:N/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-610Externally Controlled Reference to a Resource in Another Sphere
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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