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Servers and applications

CVE-2010-3493

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…

Severity
Medium 4.3
Published
19 Oct 2010
Last changed
16 Jun 2026
Added to UpHeron
21 Oct 2026
Exploit chance
2.8% in the next 30 daysHigher than 86% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
Race condition (CWE-362)
Attack
Over the network · No login needed
Attacker can
Slow it down
CVSS vector
AV:N/AC:M/Au:N/C:N/I:N/A:P
Sources
NVD

Description

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.

From NVD.

Affected software

SoftwareAffected versions
PythonServers and applications · cpe:a:python:python
  • Version 3.1
  • Version 3.2-alpha

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2010-3493
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2010-3493