Race condition in Python - CVE-2010-3493

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Main Vulnerability Database Vulnerabilities #VU110149

Race condition in Python - CVE-2010-3493

Published: October 25, 2019 / Updated: June 3, 2025


Vulnerability identifier: #VU110149
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2010-3493
CWE-ID: CWE-362
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Python.org
Affected software:
Python

Detailed vulnerability description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

Multiple race conditions in smtpd.py in the smtpd module in Python 2.6, 2.7, 3.1, and 3.2 alpha allow remote attackers to cause a denial of service (daemon outage) by establishing and then immediately closing a TCP connection, leading to the accept function having an unexpected return value of None, an unexpected value of None for the address, or an ECONNABORTED, EAGAIN, or EWOULDBLOCK error, or the getpeername function having an ENOTCONN error, a related issue to CVE-2010-3492.


How to mitigate CVE-2010-3493

Install update from vendor's website.

Sources