Security readout for executives and security teams
Plain-English summary
This issue concerns old Python MSI installers on Windows choosing C:\Python27 by default. If that directory is writable by local non-administrators, they may be able to place malicious code where Python users or applications later load it. The CVE records no CVSS score and no KEV listing.
Executive priority
Treat this as a local privilege and software integrity hygiene issue, not an internet-facing emergency. Prioritize shared Windows systems, build agents, and servers where local users or automation accounts could alter Python directories.
Technical view
CVE-2019-13404 describes a Windows installation-path risk in Python through 2.7.16, also affecting old 3.x releases before 3.5. The concern is local Trojan horse placement enabled by permissive access control on the default C:\Python27 directory. The vendor position cited by CVE places responsibility on users to secure ACLs or choose another directory.
Likely exposure
Exposure is most likely on Windows hosts with Python installed from affected MSI installers into C:\Python27, especially shared workstations, build systems, or servers where local users have write access to that directory.
Exploitation context
The cited sources support local-user abuse, not remote exploitation. There is no KEV listing and no provided evidence of active exploitation. Practical risk depends on directory permissions and whether privileged or sensitive workflows load Python code from that location.
Researcher notes
The CVE record provides limited technical detail and no CVSS vector. Validation should focus on installer version, path selection, and ACL state. Do not assume exploitability unless a local untrusted user can write to the Python install directory.
Mitigation direction
- Restrict C:\Python27 write access to administrators and trusted deployment accounts.
- Choose a secured installation directory for new or rebuilt affected installations.
- Review Python vendor guidance before changing production interpreter locations.
- Remove affected Python installs where they are no longer required.
Validation and detection
- Inventory Windows systems with Python installed under C:\Python27.
- Check filesystem ACLs for non-administrator write access to C:\Python27.
- Identify applications or scheduled tasks relying on that Python installation.
- Confirm whether any old 3.x pre-3.5 MSI installs remain.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CVE-2019-13404 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://docs.python.org/2/faq/windows.htmlCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.