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CRITICAL severity

Cobbler before 3.3.0 allows log poisoningGHSA-cpqf-3c3r-c9g2

CRITICALFix: cobbler/cobbler@d8f60bb

GHSA-cpqf-3c3r-c9g2 is a critical-severity (CVSS 9.8) Code Injection vulnerability in cobbler. EPSS puts its 30-day exploitation probability at 86.8% (100th percentile). A fix is available for cobbler — see the affected versions and patch details below.

Also known asCVE-2021-40323PYSEC-2021-373
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
86.8%probability of exploitation in next 30 days
Very High Risk0.00%
Lower risk than most CVEs100th percentile — riskier than 100% of all scored CVEsHighest risk
84.9%88.3%91.7%95.1%93.2%86.8%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

GHSA-cpqf-3c3r-c9g2 by exploitation likelihood (EPSS) against impact (CVSS). In the shaded patch-first corner (EPSS 50%+, CVSS 7.0+).

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the 50–90% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐍cobbler

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

Cobbler before 3.3.0 allows log poisoning, and resultant Remote Code Execution, via an XMLRPC method that logs to the logfile for template injection.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIcobblerall versions3.3.0pip install --upgrade 'cobbler==3.3.0'

Affected Products

1 product · 1 configurations
Application
cobblercobbler_project
≤ 3.3.0
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for cobbler, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update cobbler to 3.3.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-cpqf-3c3r-c9g2 is resolved across your whole dependency graph.

  3. Workarounds

    Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.

How to detect GHSA-cpqf-3c3r-c9g2

A community-maintained Nuclei template exists for this CVE. You can scan for it directly:

nuclei -id ghsa-cpqf-3c3r-c9g2 -u https://target
Template
Cobbler <3.3.0 - Remote Code Execution
Severity
critical
Impact
Successful exploitation of this vulnerability can lead to unauthorized remote code execution, potentially resulting in complete compromise of the affected system.
Remediation
Upgrade Cobbler to version 3.3.0 or later, which includes a fix for this vulnerability.

Template by ProjectDiscovery nuclei-templates (c-sh0), MIT licensed. View the full template. Scan only systems you are authorised to test.

Frequently Asked Questions

Cobbler before 3.3.0 allows log poisoning, and resultant Remote Code Execution, via an XMLRPC method that logs to the logfile for template injection.
O3 Security · Impact-Aware SCA

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Cobbler before 3.3.0 allows log poisoning (Critical 9.8)