How severe is CVE-2021-3779?

CVE-2021-3779 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-3779 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3779?

CVE-2021-3779 affects Ruby-mysql Project Ruby-mysql. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-3779?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-3779 published?

CVE-2021-3779 was published on 2022-06-28 and last updated on 2026-06-17.

CVE-2021-3779

CVE-2021-3779 is a medium-severity vulnerability in Ruby-mysql Project Ruby-mysql with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-610.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.3
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-610
Affected product: Ruby-mysql Project Ruby-mysql
Published: 2022-06-28
Last modified: 2026-06-17

Description

A malicious MySQL server can request local file content from a client using ruby-mysql prior to version 2.10.0 without explicit authorization from the user. This issue was resolved in version 2.10.0 and later.

Frequently asked questions

What is CVE-2021-3779?: A malicious MySQL server can request local file content from a client using ruby-mysql prior to version 2.10.0 without explicit authorization from the user. This issue was resolved in version 2.10.0 and later.
How severe is CVE-2021-3779?: CVE-2021-3779 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-3779 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3779?: CVE-2021-3779 affects Ruby-mysql Project Ruby-mysql. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-3779?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-3779 published?: CVE-2021-3779 was published on 2022-06-28 and last updated on 2026-06-17.

References

https://www.rapid7.com/blog/post/2022/06/28/cve-2021-3779-ruby-mysql-gem-client-file-read-fixed/

Affected products (1)

cpe:2.3:a:ruby-mysql_project:ruby-mysql:*:*:*:*:*:ruby:*:*

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