CVE-2013-1633 — setuptools
HIGHCVE-2013-1633 is a high-severity (CVSS 8.3) Improper Input Validation vulnerability in setuptools. A fix is available for setuptools — see the affected versions and patch details below.
Setuptools vulnerable to Man-in-the-middle attacks
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
setuptoolsReal-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
easy_install in setuptools before 0.7 uses HTTP to retrieve packages from the PyPI repository, and does not perform integrity checks on package contents, which allows man-in-the-middle attackers to execute arbitrary code via a crafted response to the default use of the product.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | setuptools | all versions | 0.7pip install --upgrade 'setuptools==0.7' |
Affected Products
setuptoolspythonDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for setuptools, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update setuptools to 0.7 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2013-1633 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
Frequently Asked Questions
Is CVE-2013-1633 in your dependencies?
Find it across PyPI, including transitive dependencies.