CVE catalog
CVE-2021-31810
jruby: CVE-2021-31810
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 3.05% · Oct 25, 2026
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).
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | jruby | sid | 10.1.2.0+ds-1 | fixed |
| Debian | jruby | forky | 10.1.2.0+ds-1 | fixed |
| Debian | jruby | trixie | 9.4.8.0+ds-3 | fixed |
| Debian | jruby | bookworm | 9.3.9.0+ds-8 | fixed |
| Alpine | ruby | 3.11 | 2.6.8-r0 | fixed |
| Alpine | ruby | 3.12 | 2.7.4-r0 | fixed |
| Alpine | ruby | 3.13 | 2.7.4-r0 | fixed |
| Alpine | ruby | 3.14 | 2.7.4-r0 | fixed |
| Alpine | ruby | 3.15 | 2.7.4-r0 | fixed |
| Alpine | ruby | 3.16 | 2.7.4-r0 | fixed |
| Alpine | ruby | 3.17 | 2.7.4-r0 | fixed |
| Alpine | ruby | 3.18 | 2.7.4-r0 | fixed |
| Alpine | ruby | 3.19 | 2.7.4-r0 | fixed |
| Alpine | ruby | 3.20 | 2.7.4-r0 | fixed |
| Alpine | ruby | 3.21 | 2.7.4-r0 | fixed |
| Alpine | ruby | 3.22 | 2.7.4-r0 | fixed |
| Alpine | ruby | 3.23 | 2.7.4-r0 | fixed |
| Alpine | ruby | 3.24 | 2.7.4-r0 | fixed |
| Ubuntu | ruby2.3 | pro | 2.3.0-1 | vulnerable |
| Ubuntu | ruby2.3 | pro | 2.3.0-2 | vulnerable |
| Ubuntu | ruby2.3 | pro | 2.3.0-4ubuntu2 | vulnerable |
| Ubuntu | ruby2.3 | pro | 2.3.0-4ubuntu3 | vulnerable |
| Ubuntu | ruby2.3 | pro | 2.3.0-5ubuntu1 | vulnerable |
| Ubuntu | ruby2.3 | pro | 2.3.1-2~16.04 | vulnerable |
| Ubuntu | ruby2.3 | pro | 2.3.1-2~16.04.2 | vulnerable |
| Ubuntu | ruby2.3 | pro | 2.3.1-2~16.04.4 | vulnerable |
| Ubuntu | ruby2.3 | pro | 2.3.1-2~16.04.5 | vulnerable |
| Ubuntu | ruby2.3 | pro | 2.3.1-2~16.04.6 | vulnerable |
| Ubuntu | ruby2.3 | pro | 2.3.1-2~16.04.7 | vulnerable |
| Ubuntu | ruby2.3 | pro | 2.3.1-2~16.04.9 | vulnerable |
| Ubuntu | ruby2.3 | pro | 2.3.1-2~16.04.10 | vulnerable |
| Ubuntu | ruby2.3 | pro | 2.3.1-2~16.04.11 | vulnerable |
| Ubuntu | ruby2.3 | pro | 2.3.1-2~16.04.12 | vulnerable |
| Ubuntu | ruby2.3 | pro | 2.3.1-2~ubuntu16.04.13 | vulnerable |
| Ubuntu | ruby2.3 | pro | 2.3.1-2~ubuntu16.04.14 | vulnerable |
| Ubuntu | ruby2.3 | pro | 2.3.1-2~ubuntu16.04.15 | vulnerable |
| Ubuntu | ruby2.3 | pro | 2.3.1-2~ubuntu16.04.16 | vulnerable |
| Ubuntu | ruby2.3 | pro | 2.3.1-2~ubuntu16.04.16+esm1 | fixed |
| Ubuntu | ruby2.5 | 18.04 | 2.5.0~preview1-1ubuntu2 | vulnerable |
| Ubuntu | ruby2.5 | 18.04 | 2.5.0-4ubuntu1 | vulnerable |
| Ubuntu | ruby2.5 | 18.04 | 2.5.0-4ubuntu4 | vulnerable |
| Ubuntu | ruby2.5 | 18.04 | 2.5.0-5ubuntu1 | vulnerable |
| Ubuntu | ruby2.5 | 18.04 | 2.5.0-6ubuntu1 | vulnerable |
| Ubuntu | ruby2.5 | 18.04 | 2.5.1-1ubuntu1 | vulnerable |
| Ubuntu | ruby2.5 | 18.04 | 2.5.1-1ubuntu1.1 | vulnerable |
| Ubuntu | ruby2.5 | 18.04 | 2.5.1-1ubuntu1.2 | vulnerable |
| Ubuntu | ruby2.5 | 18.04 | 2.5.1-1ubuntu1.4 | vulnerable |
| Ubuntu | ruby2.5 | 18.04 | 2.5.1-1ubuntu1.5 | vulnerable |
| Ubuntu | ruby2.5 | 18.04 | 2.5.1-1ubuntu1.6 | vulnerable |
| Ubuntu | ruby2.5 | 18.04 | 2.5.1-1ubuntu1.7 | vulnerable |
| Ubuntu | ruby2.5 | 18.04 | 2.5.1-1ubuntu1.8 | vulnerable |
| Ubuntu | ruby2.5 | 18.04 | 2.5.1-1ubuntu1.9 | vulnerable |
| Ubuntu | ruby2.5 | 18.04 | 2.5.1-1ubuntu1.10 | fixed |
| Ubuntu | ruby2.7 | 20.04 | 2.7.0-1 | vulnerable |
| Ubuntu | ruby2.7 | 20.04 | 2.7.0-2 | vulnerable |
| Ubuntu | ruby2.7 | 20.04 | 2.7.0-3 | vulnerable |
| Ubuntu | ruby2.7 | 20.04 | 2.7.0-4 | vulnerable |
| Ubuntu | ruby2.7 | 20.04 | 2.7.0-4ubuntu1 | vulnerable |
| Ubuntu | ruby2.7 | 20.04 | 2.7.0-5ubuntu1 | vulnerable |
| Ubuntu | ruby2.7 | 20.04 | 2.7.0-5ubuntu1.1 | vulnerable |
| Ubuntu | ruby2.7 | 20.04 | 2.7.0-5ubuntu1.2 | vulnerable |
| Ubuntu | ruby2.7 | 20.04 | 2.7.0-5ubuntu1.3 | vulnerable |
| Ubuntu | ruby2.7 | 20.04 | 2.7.0-5ubuntu1.4 | vulnerable |
| Ubuntu | ruby2.7 | 20.04 | 2.7.0-5ubuntu1.5 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | jruby | source | sid | 9.3.9.0+ds-1 | not yet assigned | Not reported | [1014818] |
| Debian | jruby | source | forky | 9.3.9.0+ds-1 | not yet assigned | Not reported | [1014818] |
| Debian | jruby | source | trixie | 9.3.9.0+ds-1 | not yet assigned | Not reported | [1014818] |
| Debian | jruby | source | bookworm | 9.3.9.0+ds-1 | not yet assigned | Not reported | [1014818] |
| Alpine | ruby | apk | 3.11 | 2.6.8-r0 | Not reported | ALPINE-CVE-2021-31810 | Not reported |
| Alpine | ruby | apk | 3.12 | 2.7.4-r0 | Not reported | ALPINE-CVE-2021-31810 | Not reported |
| Alpine | ruby | apk | 3.13 | 2.7.4-r0 | Not reported | ALPINE-CVE-2021-31810 | Not reported |
| Alpine | ruby | apk | 3.14 | 2.7.4-r0 | Not reported | ALPINE-CVE-2021-31810 | Not reported |
| Alpine | ruby | apk | 3.15 | 2.7.4-r0 | Not reported | ALPINE-CVE-2021-31810 | Not reported |
| Alpine | ruby | apk | 3.16 | 2.7.4-r0 | Not reported | ALPINE-CVE-2021-31810 | Not reported |
| Alpine | ruby | apk | 3.17 | 2.7.4-r0 | Not reported | ALPINE-CVE-2021-31810 | Not reported |
| Alpine | ruby | apk | 3.18 | 2.7.4-r0 | Not reported | ALPINE-CVE-2021-31810 | Not reported |
| Alpine | ruby | apk | 3.19 | 2.7.4-r0 | Not reported | ALPINE-CVE-2021-31810 | Not reported |
| Alpine | ruby | apk | 3.20 | 2.7.4-r0 | Not reported | ALPINE-CVE-2021-31810 | Not reported |
| Alpine | ruby | apk | 3.21 | 2.7.4-r0 | Not reported | ALPINE-CVE-2021-31810 | Not reported |
| Alpine | ruby | apk | 3.22 | 2.7.4-r0 | Not reported | ALPINE-CVE-2021-31810 | Not reported |
| Alpine | ruby | apk | 3.23 | 2.7.4-r0 | Not reported | ALPINE-CVE-2021-31810 | Not reported |
| Alpine | ruby | apk | 3.24 | 2.7.4-r0 | Not reported | ALPINE-CVE-2021-31810 | Not reported |
| Ubuntu | ruby2.3 | deb | pro | 2.3.1-2~ubuntu16.04.16+esm1 | Not reported | UBUNTU-CVE-2021-31810 | Not reported |
| Ubuntu | ruby2.5 | deb | 18.04 | 2.5.1-1ubuntu1.10 | Not reported | UBUNTU-CVE-2021-31810 | Not reported |
| Ubuntu | ruby2.7 | deb | 20.04 | 2.7.0-5ubuntu1.5 | Not reported | UBUNTU-CVE-2021-31810 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [jruby]Fixed
Details (2)
9.3.9.0+ds-8· all · bookwormFixed · Fixed:
9.3.9.0+ds-1dsa · jruby · debian · bookworm; dsa · jruby · debian · 12
9.3.9.0+ds-8· all · bookwormFixed · Fixed:
9.3.9.0+ds-1dsa · jruby · debian · bookworm; dsa · jruby · debian · 12
[Debian 13 (Trixie)]
- [jruby]Fixed
Details (2)
9.4.8.0+ds-3· all · trixieFixed · Fixed:
9.3.9.0+ds-1dsa · jruby · debian · 13
9.4.8.0+ds-3· all · trixieFixed · Fixed:
9.3.9.0+ds-1dsa · jruby · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/rhsa-2021_3020.json]
- [https://osv.dev/vulnerability/ALPINE-CVE-2021-31810]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2021-31810]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2021-31810]
- [https://security-tracker.debian.org/tracker/CVE-2021-31810]
- [https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-31810.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2021/wid-sec-w-2022-1305.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]