CVE-2021-43809
medium
CVSS v3
—
CVSS v4 NEW
—
VIR risk
5.5
Description
RHSA-2025:7539: ruby:2.5 security update (Moderate)
Predictions
Exploit likelihood
20%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
Arch Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 3.3.5-1 |
| sid | Fixed | 3.3.5-1 |
| forky | Fixed | 3.3.5-1 |
| bullseye | Fixed | 3.2.5-2+deb11u1 |
| bookworm | Fixed | 3.3.5-1 |
Red Hat Fixed 1 release
| Version | Status | Fixed in |
|---|---|---|
| 8 | Fixed | — |
Rocky Linux Fixed 1 release
| Version | Status | Fixed in |
|---|---|---|
| 8 | Fixed | — |
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
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.