PatchTheCVECVE-2021-27025: A flaw was discovered in Puppet Agent where the agent may silently ignore Augeas settings or may be vulnerable
39
Routine
MEDIUM 6.5UPGRADEUPGRADEUPGRADE
CVE-2021-27025 is a medium-severity flaw (CVSS 6.5) affecting puppet, puppet agent, puppet enterprise. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
A flaw was discovered in Puppet Agent where the agent may silently ignore Augeas settings or may be vulnerable to a Denial of Service condition prior to the first 'pluginsync'.
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.5 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 1.1% (top 34%) |
| CISA exploited list | No |
| Published | 2021-11-18 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
puppet puppet UPGRADE
Affected: >= 2021.0.0 and < 2021.4.0
Fixed in: 2021.4.0
Safe to downgrade to: a release before 2021.0.0
1. Check installed version
apt-cache policy puppet || rpm -q puppet || puppet --version
2. UPGRADE to 2021.4.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade puppet
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade puppet
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 2021.0.0 (Debian / Ubuntu)
apt-cache madison puppet
sudo apt install puppet=<VERSION_BEFORE_2021.0.0>
sudo apt-mark hold puppet
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list puppet
sudo dnf downgrade puppet-<VERSION_BEFORE_2021.0.0>
sudo dnf versionlock add puppet
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.
puppet puppet agent UPGRADE
Affected: < 6.25.1 · >= 5.5.0 and <= 5.5.22 · >= 7.0.0 and < 7.12.1
Fixed in: 6.25.1, 7.12.1
Safe to downgrade to: a release before 5.5.0
1. Check installed version
apt-cache policy puppet-agent || rpm -q puppet-agent || puppet-agent --version
2. UPGRADE to 6.25.1 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade puppet-agent
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade puppet-agent
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 5.5.0 (Debian / Ubuntu)
apt-cache madison puppet-agent
sudo apt install puppet-agent=<VERSION_BEFORE_5.5.0>
sudo apt-mark hold puppet-agent
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list puppet-agent
sudo dnf downgrade puppet-agent-<VERSION_BEFORE_5.5.0>
sudo dnf versionlock add puppet-agent
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.
puppet puppet enterprise UPGRADE
Affected: < 2019.8.9
Fixed in: 2019.8.9
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy puppet-enterprise || rpm -q puppet-enterprise || puppet-enterprise --version
2. UPGRADE to 2019.8.9 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade puppet-enterprise
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade puppet-enterprise
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
fedoraproject fedora MITIGATE
Affected: 35
Fixed in: no fixed release known
Safe to downgrade to: a release before 35
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
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.
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-2021-27025?
puppet: upgrade to 2021.4.0; puppet agent: upgrade to 6.25.1, 7.12.1; puppet enterprise: upgrade to 2019.8.9. Exact commands for each OS are on this page.
Is CVE-2021-27025 being exploited?
CVE-2021-27025 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-2021-27025 affect?
CVE-2021-27025 affects puppet, puppet agent, puppet enterprise. Severity is medium (CVSS 6.5). A flaw was discovered in Puppet Agent where the agent may silently ignore Augeas settings or may be vulnerable to a Denial of Service condition prior to the first 'pluginsync'.
How urgent is CVE-2021-27025?
Priority 39/100. No elevated risk signals yet.
Related CVEs
- CVE-2021-27026 MEDIUM 4.4 UPGRADE UPGRADE A flaw was divered in Puppet Enterprise and other Puppet products where sensitive plan parameters may be logge
- CVE-2021-27022 MEDIUM 4.9 UPGRADE UPGRADE A flaw was discovered in bolt-server and ace where running a task with sensitive parameters results in those s
- CVE-2021-27021 HIGH 8.8 UPGRADE UPGRADE A flaw was discovered in Puppet DB, this flaw results in an escalation of privileges which allows the user to
- CVE-2020-7942 MEDIUM 6.5 UPGRADE UPGRADE Previously, Puppet operated on a model that a node with a valid certificate was entitled to all information in
- CVE-2018-6515 HIGH 7.8 UPGRADE Puppet Agent 1.10.x prior to 1.10.13, Puppet Agent 5.3.x prior to 5.3.7, and Puppet Agent 5.5.x prior to 5.5.2