How severe is CVE-2018-1000117?

CVE-2018-1000117 has a CVSS 3.x base score of 6.7, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-1000117 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-1000117?

CVE-2018-1000117 primarily affects Python. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-1000117?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-1000117 published?

CVE-2018-1000117 was published on 2018-03-07 and last updated on 2026-06-17.

CVE-2018-1000117

CVE-2018-1000117 is a medium-severity vulnerability in Python with a CVSS 3.x base score of 6.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-120.

Key facts

Severity: Medium (CVSS 3.x base score 6.7)
CVSS v2: 7.2
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Python
Published: 2018-03-07
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2018-1000117?: 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.
How severe is CVE-2018-1000117?: CVE-2018-1000117 has a CVSS 3.x base score of 6.7, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-1000117 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-1000117?: CVE-2018-1000117 primarily affects Python. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-1000117?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-1000117 published?: CVE-2018-1000117 was published on 2018-03-07 and last updated on 2026-06-17.

References

Affected products (6)

cpe:2.3:a:python:python:*:*:*:*:*:*:*:*
cpe:2.3:a:python:python:3.7.0:beta1:*:*:*:*:*:*
cpe:2.3:a:python:python:3.7.0:beta2:*:*:*:*:*:*
cpe:2.3:a:python:python:3.7.0:beta3:*:*:*:*:*:*
cpe:2.3:a:python:python:3.7.0:beta4:*:*:*:*:*:*
cpe:2.3:a:python:python:3.7.0:beta5:*:*:*:*:*:*

More vulnerabilities in Python

CVE-2008-5031 — Critical (CVSS 10.0): Multiple integer overflows in Python 2.2.3 through 2.5.1, and 2.6, allow context-dependent attackers to have an unknown…
CVE-2022-48565 — Critical (CVSS 9.8): An XML External Entity (XXE) issue was discovered in Python through 3.9.1. The plistlib module no longer accepts entity…
CVE-2022-37454 — Critical (CVSS 9.8): The Keccak XKCP SHA-3 reference implementation before fdc6fef has an integer overflow and resultant buffer overflow…
CVE-2021-29921 — Critical (CVSS 9.8): In Python before 3,9,5, the ipaddress library mishandles leading zero characters in the octets of an IP address string.…
CVE-2021-3177 — Critical (CVSS 9.8): Python 3.x through 3.9.1 has a buffer overflow in PyCArg_repr in _ctypes/callproc.c, which may lead to remote code…
CVE-2020-27619 — Critical (CVSS 9.8): In Python 3 through 3.9.0, the Lib/test/multibytecodec_support.py CJK codec tests call eval() on content retrieved via…

All CVEs affecting Python →

Other CWE-120 (Classic Buffer Overflow) vulnerabilities

CVE-2025-48611 — Critical (CVSS 10.0): In DeviceId of DeviceId.java, there is a possible desync in persistence due to a missing bounds check. This could lead…
CVE-2026-24823 — Critical (CVSS 10.0): Out-of-bounds Write, Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in FASTSHIFT…
CVE-2026-24810 — Critical (CVSS 10.0): Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in rethinkdb (src/cjson modules).…
CVE-2026-24800 — Critical (CVSS 10.0): Out-of-bounds Write, Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in tildearrow…
CVE-2025-9962 — Critical (CVSS 10.0): A buffer overflow vulnerability in Novakon P series allows attackers to gain root permission without prior…
CVE-2010-10016 — Critical (CVSS 10.0): BS.Player version 2.57 (build 1051) contains a vulnerability in its playlist import functionality. When processing .m3u…

Browse all CWE-120 (Classic Buffer Overflow) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

222.88.237.152 (ipv4-addr)
120.224.15.67 (ipv4-addr)