🛡️ CVE-2021-31810 — ruby

🟡 CVSS 5.0 — Medium ✅ No Known Exploit OSV
5.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

An issue was discovered in Ruby through 2.6.7, 2.7.x through 2.7.3, and 3.x through 3.0.1. A malicious FTP server can use the PASV response to trick Net::FTP into connecting back to a given IP address and port. This potentially makes curl extract information about services that are otherwise private and not disclosed (e.g., the attacker can conduct port scans and service banner extractions).

Affected software

CVE-2021-31810 is recorded against 2 packages.

  • ruby
  • ruby-min

Timeline and source

Published on 6 March 2024 and last revised on 3 April 2025. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

hackerone.com (Web)
lists.debian.org (Web)
lists.debian.org (Web)
lists.fedoraproject.org (Web)
security.gentoo.org (Web)
security.netapp.com (Web)
www.oracle.com (Web)
www.ruby-lang.org (Web)
nvd.nist.gov (Web)

CVE-2021-31810 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity MEDIUM
CVSS Score 5.0
CVSS Vector N/A
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2024-03-06
Updated 2026-06-02
Modified 2025-04-03
Fix URL N/A

Affected Packages

Software From version Fixed in
ruby — —
ruby-min — —

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