CVE-2018-1000117

Name: CVE-2018-1000117
Creator: NVD / NIST
Published: 2018-03-07T14:29:00.28+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.7/10EPSS 1.11%

Last modified Jun 17, 2026

CVE-2018-1000117 is a medium-severity vulnerability rated 6.7/10 on the CVSS scale. Python Software Foundation CPython version From 3.2 until 3.6.4 on Windows contains a Buffer Overflow vulnerability in os.symlink() function on Windows that can result in Arbitrary code execution, likely escalation of privilege. This attack appears to be exploitable via a python script that creates a symlink with an attacker controlled name or location. EPSS estimates a 1.11% chance of exploitation in the next 30 days.

Description

Python Software Foundation CPython version From 3.2 until 3.6.4 on Windows contains a Buffer Overflow vulnerability in os.symlink() function on Windows that can result in Arbitrary code execution, likely escalation of privilege. This attack appears to be exploitable via a python script that creates a symlink with an attacker controlled name or location. This vulnerability appears to have been fixed in 3.7.0 and 3.6.5.

Metrics

CVSS 3.1

6.7/10

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.11%

61.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-120

Affected Software

Vendor	Product	Versions	Update
Python	Python	>= 3.2.0, < 3.4.9	—
Python	Python	>= 3.5.0, < 3.5.6	—
Python	Python	>= 3.6.0, < 3.6.5	—
Python	Python	3.7.0	Beta1

References

https://bugs.python.org/issue33001Issue Tracking, Patch, Third Party Advisory
https://github.com/python/cpython/pull/5989Issue Tracking, Patch, Vendor Advisory
https://bugs.python.org/issue33001Issue Tracking, Patch, Third Party Advisory
https://github.com/python/cpython/pull/5989Issue Tracking, Patch, Vendor Advisory

Timeline

Published: Mar 7, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-1000117?

How severe is CVE-2018-1000117?

CVE-2018-1000117 has a CVSS score of 6.7/10 (MEDIUM severity). The EPSS model estimates a 1.11% probability of exploitation in the next 30 days.

How do I fix CVE-2018-1000117?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-1000117?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST