CVE-2021-31810

Public Exploit

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).

5.8

CVSS

Severity: Medium

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.74% Top 30%

Vendor Advisory fedoraproject.org Vendor Advisory gentoo.org Vendor Advisory ruby-lang.org

Affected: n/a n/a

References

Link	Tags
https://hackerone.com/reports/1145454	exploit third party advisory patch
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MWXHK5UUHVSHF7HTHMX6JY3WXDVNIHSL/	vendor advisory
https://lists.debian.org/debian-lts-announce/2021/10/msg00009.html	third party advisory mailing list
https://www.oracle.com/security-alerts/cpuapr2022.html	third party advisory patch
https://www.ruby-lang.org/en/news/2021/07/07/trusting-pasv-responses-in-net-ftp/	vendor advisory
https://security.netapp.com/advisory/ntap-20210917-0001/	third party advisory
https://lists.debian.org/debian-lts-announce/2023/04/msg00033.html	mailing list
https://security.gentoo.org/glsa/202401-27	vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-31810?: CVE-2021-31810 has been scored as a medium severity vulnerability.
How to fix CVE-2021-31810?: To fix CVE-2021-31810, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-31810 being actively exploited in the wild?: It is possible that CVE-2021-31810 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

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