CVE intelligence and bounded remediation

CVE-2014-4650 — Python Python security vulnerability

Critical CVSS 9.8

The CGIHTTPServer module in Python 2.7.5 and 3.3.4 does not properly handle URLs in which URL encoding is used for path separators, which allows remote attackers to read script source code or conduct directory traversal attacks and execute unintended code via a crafted character sequence, as demonstrated by a %2f separator.

Severity
Critical
CVSS
9.8 (3.1)
Published
2020-02-20
CISA KEV
Not currently listed
Ecosystem
python/pypi
Weaknesses
CWE-22

Affected products

  • python / python
  • redhat / software_collections
  • redhat / enterprise_linux / 5.0
  • redhat / enterprise_linux / 6.0
  • redhat / enterprise_linux / 7.0

Showing 5 representative product identities from 8 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Path traversal, unsafe upload, and file handling

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Check exposure

  • Trace untrusted filenames, archive entries, URLs, and path segments into read, write, include, extraction, and upload operations.
  • Identify filesystem roots, mount permissions, symbolic-link behavior, archive handling, and whether uploaded content is web-accessible or executable.
  • Review canonicalization and containment checks across supported operating systems and storage backends.

Remediate safely

  • Generate server-side storage identifiers and resolve paths beneath a fixed root using filesystem-aware containment checks.
  • Reject absolute, parent-relative, alternate-separator, device, link, and archive entries that escape the intended root.
  • Store uploads outside executable or served paths, validate type and size, and use private atomic temporary files.

Authoritative sources

Complete CVE record and remediation plan

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