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 the getpeername function having an ENOTCONN error, a related issue to CVE-2010-3492.
Key facts
- CVSS score
- 4.3 (v2.0)
- Severity
- MEDIUM
- CVSS vector
AV:N/AC:M/Au:N/C:N/I:N/A:P- Weakness (CWE)
- CWE-362
- EPSS score
- 2.8% (87th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2010-3491)
- Published
- October 19, 2010
- NVD last modified
- June 16, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2010-3491 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.
View on the EU Vulnerability DatabaseAffected products
- python / python
- python / python
References
- http://bugs.python.org/issue6706(Patch, Vendor Advisory)
- http://bugs.python.org/issue9129(Patch, Vendor Advisory)
- 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(Patch)
- 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
- http://www.openwall.com/lists/oss-security/2010/09/09/6
- http://www.openwall.com/lists/oss-security/2010/09/11/2
- http://www.openwall.com/lists/oss-security/2010/09/22/3
- http://www.openwall.com/lists/oss-security/2010/09/24/3
- http://www.securityfocus.com/bid/44533
- http://www.ubuntu.com/usn/USN-1596-1
- http://www.ubuntu.com/usn/USN-1613-1
- http://www.ubuntu.com/usn/USN-1613-2
- http://www.vupen.com/english/advisories/2011/0212
- https://bugs.launchpad.net/zodb/+bug/135108
- https://bugzilla.redhat.com/show_bug.cgi?id=632200
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12210
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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