ALPINE-CVE-2021-31810

Advisory lineage Upstream: 1 Downstream: 0
Upstream
CVE-2021-31810
Published: 13 Jul 2021, 13:15
Last modified:03 Dec 2025, 22:48

Vulnerability Summary

Overall Risk (default)
low
23/100
CVSS Score
5.8 MEDIUM
3.1 (osv_alpine)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

13 Jul 2021, 13:15
Published
Vulnerability first disclosed
03 Dec 2025, 22:48
Last Modified
Vulnerability information updated

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).

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

Affected Systems

  • alpine•ruby

    < 2.6.8-r0 | < 2.7.4-r0 | < 2.7.4-r0 | < 2.7.4-r0 | < 2.7.4-r0 | < 2.7.4-r0 | < 2.7.4-r0 | < 2.7.4-r0 | < 2.7.4-r0 | < 2.7.4-r0 | < 2.7.4-r0 | < 2.7.4-r0 | < 2.7.4-r0

References (1)