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Not in CISA KEV
HIGH severity

CVE-2021-40324 — cobbler

HIGHFix: cobbler/cobbler@d8f60bb

CVE-2021-40324 is a high-severity (CVSS 7.5) Unrestricted File Upload vulnerability in cobbler. EPSS puts its 30-day exploitation probability at 68.6% (99th percentile). A fix is available for cobbler — see the affected versions and patch details below.

Cobbler before 3.3.0 allows arbitrary file write operations via upload_log_data.

Also known asGHSA-4cfr-gjfx-fj3xPYSEC-2021-374
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
68.6%probability of exploitation in next 30 days
High Risk0.00%
Lower risk than most CVEs99th percentile — riskier than 99% of all scored CVEsHighest risk
0.00%29.5%59.0%88.5%2.4%68.6%Apr 26Aug 26Oct 26

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

How urgent is this, really

CVE-2021-40324 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 arbitrary file write operations via upload_log_data.

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 CVE-2021-40324 is resolved across your whole dependency graph.

  3. Workarounds

    Treat uploaded files as untrusted until proven otherwise: validate the actual content type rather than the supplied extension, store uploads outside the web root on a volume mounted without execute permission, and rename them to server-generated identifiers so an attacker cannot choose the path a request will later resolve.

Frequently Asked Questions

Cobbler before 3.3.0 allows arbitrary file write operations via upload_log_data.
O3 Security · Impact-Aware SCA

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CVE-2021-40324: cobbler — Fixed in 3.3.0