CVE-2010-3493

Severity: medium (CVSS 4.3 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2010-10-19 · updated 2026-06-16
Weakness: CWE-362

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.

Affected products

Python: 3.1, 3.2-alpha

References

http://bugs.python.org/issue6706
http://bugs.python.org/issue9129
http://lists.opensuse.org/opensuse-security-announce/2010-12/msg00006.html
http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00006.html
http://secunia.com/advisories/43068
http://secunia.com/advisories/50858
http://secunia.com/advisories/51024
http://secunia.com/advisories/51040
http://svn.python.org/view/python/branches/py3k/Lib/smtpd.py?r1=84289&r2=84288&pathrev=84289
http://svn.python.org/view?view=rev&revision=84289
http://www.mandriva.com/security/advisories?name=MDVSA-2010:215
http://www.mandriva.com/security/advisories?name=MDVSA-2010:216

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