CVE-2021-37587: In Charm 0.43, any single user can decrypt DAC-MACS or MA-ABE-YJ14 data.

Routine

MEDIUM 6.5DOWNGRADE

CVE-2021-37587 is a medium-severity flaw (CVSS 6.5) affecting charm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Charm 0.43, any single user can decrypt DAC-MACS or MA-ABE-YJ14 data.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-327
Published	2021-07-30
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: jhu

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-07-30 14:15 UTCPublished CVE record published
2026-06-17 04:00 UTCUpdated Record last modified

jhu charm DOWNGRADE

Affected: 0.43

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.43

1. Check installed version

apt-cache policy charm || rpm -q charm || charm --version

2. No fixed release: DOWNGRADE to a release before 0.43 (Debian / Ubuntu)

apt-cache madison charm sudo apt install charm=<VERSION_BEFORE_0.43> sudo apt-mark hold charm

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list charm sudo dnf downgrade charm-<VERSION_BEFORE_0.43> sudo dnf versionlock add charm

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-37587?

charm: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-37587 being exploited?

CVE-2021-37587 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-37587 affect?

CVE-2021-37587 affects charm. Severity is medium (CVSS 6.5). In Charm 0.43, any single user can decrypt DAC-MACS or MA-ABE-YJ14 data.

How urgent is CVE-2021-37587?

Priority 37/100. No elevated risk signals yet.

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CVE-2022-29180 MEDIUM 5.9 UPGRADE A vulnerability in which attackers could forge HTTP requests to manipulate the `charm` data directory to acces
CVE-2021-37588 MEDIUM 5.9 DOWNGRADE In Charm 0.43, any two users can collude to achieve the ability to decrypt YCT14 data.

References

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