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Fencer Intel
high 8.3

CVE-2013-1633 json

Setuptools vulnerable to Man-in-the-middle attacks

published 13y ago modified 4mo ago also GHSA-27x4-j476-jp5f , PYSEC-2013-22 , EUVD-2013-0040

cvss
8.3
version 3.1, GitHub
cisa kev
Not listed
not in CISA's catalog
epss
2.0%
EPSS 2.0% chance of exploitation in 30 days, percentile 80%
public exploits
0
none known

Summary

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.

Patch / fix

  • pypi setuptools 0.7

Is CVE-2013-1633 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2013-1633 updated cvss 4.4

python-setuptools: easy_install insecure installation mechanism

  • Red Hat OpenShift Enterprise 1 python-virtualenv
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux 5 python-setuptools Red Hat Enterprise Linux 6 python-setuptools
    affected: no fix available
  • Red Hat Enterprise MRG 1 python-setuptools
    affected: no fix planned “Will not fix”
  • Red Hat Software Collections python27-python-setuptools, python27-python-virtualenv, python33-python-setuptools, python33-python-virtualenv
    affected: no fix available
  • Red Hat Enterprise Linux 7 python-setuptools, python-virtualenv
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.96% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P
GitHub 3.1 8.3 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
pypi setuptools
<0.7
0.7

Classification

Weakness
  • CWE-20 Improper Input Validation
  • CWE-319 Cleartext Transmission of Sensitive Information

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.