CVE-2021-43809
medium
CVSS v3
—
CVSS v2
—
VIR risk
5.5
Description
Moderate: ruby:2.5 security update
Predictions
Exploit likelihood
20%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: alma — https://errata.almalinux.org/8/ALSA-2025-7539.html
Vendor advisory: alma — https://bugzilla.redhat.com/2035260
Vendor advisory: alma — https://bugzilla.redhat.com/1802051
Vendor advisory: alma — https://access.redhat.com/errata/RHSA-2025:7539
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2021-43809
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2021-43809.html
Vendor advisory: rocky — https://errata.rockylinux.org/RLSA-2025:7539
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| arch | affected | | |
| rocky | 8 | fixed | |
| sles | affected | | |
| debian | bookworm | fixed | 3.3.5-1 |
| debian | bullseye | fixed | 3.2.5-2+deb11u1 |
| debian | forky | fixed | 3.3.5-1 |
| debian | sid | fixed | 3.3.5-1 |
| debian | trixie | fixed | 3.3.5-1 |
References
- https://github.com/rubygems/rubygems/security/advisories/GHSA-fj7f-vq84-fh43
- https://errata.rockylinux.org/RLSA-2025:7539
- https://www.suse.com/security/cve/CVE-2021-43809.html
- https://nvd.nist.gov/vuln/detail/CVE-2021-43809
- https://github.com/rubygems/rubygems/pull/5142
- https://github.com/rubygems/rubygems/commit/0fad1ccfe9dd7a3c5b82c1496df3c2b4842870d3
- https://github.com/rubygems/rubygems/commit/a4f2f8ac17e6ce81c689527a8b6f14381060d95f
- https://github.com/rubygems/rubygems
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/bundler/CVE-2021-43809.yml
- https://lists.debian.org/debian-lts-announce/2025/05/msg00015.html
- https://www.sonarsource.com/blog/securing-developer-tools-package-managers
- https://security-tracker.debian.org/tracker/CVE-2021-43809
- https://access.redhat.com/errata/RHSA-2025:7539
- https://bugzilla.redhat.com/1802051
- https://bugzilla.redhat.com/2035260
- https://errata.almalinux.org/8/ALSA-2025-7539.html
Verify integrity in audit chain (admin only). AS-IS.