Name: CVE-2021-31800: Improper Limitation of a Pathname to a Restricted Directory
Creator: Rapid7
Published: 2021-05-05T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2021-31800, CWE-22, CVSS 9.8, EPSS 0.39208

Multiple path traversal vulnerabilities exist in smbserver.py in Impacket through 0.9.22. An attacker that connects to a running smbserver instance can list and write to arbitrary files via ../ directory traversal. This could potentially be abused to achieve arbitrary code execution by replacing /etc/shadow or an SSH authorized key.

CVSS Details

CVSS 3.1 Base Score: 9.8
CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Alpine Linux	—	Upgrade py3-impacket	Aug 22, 2024	May 5, 2021
Arch Linux	—	Upgrade to the latest version of Arch Linux	Jul 11, 2025	May 5, 2021
Debian	—	Upgrade impacket	Jul 30, 2024	May 5, 2021
Freebsd	—	Upgrade py39-impacketUpgrade py37-impacketUpgrade py38-impacketUpgrade py310-impacketUpgrade py311-impacket	Apr 14, 2023	Apr 9, 2023

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CVSS Details

Covered by Rapid7

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