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CVE-2010-3493

17
FAUCET Score

CVE-2010-3493 describes multiple race conditions in the smtpd.py module within Python versions 2.6, 2.7, 3.1, and 3.2 alpha. These race conditions allow remote attackers to trigger a denial of service by rapidly establishing and closing TCP connections, leading to unexpected errors or None values during connection handling. The vulnerability has a CVSS score of 4.3, indicating a medium attack complexity and potential for partial denial of service, with no impact on confidentiality or integrity. There is no known active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
3.1CPE matchmatch criteria
cpe:2.3:a:python:python:3.1:*:*:*:*:*:*:*
3.2CPE matchmatch criteria
cpe:2.3:a:python:python:3.2:alpha:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.3MEDIUM

AV:N/AC:M/Au:N/C:N/I:N/A:P

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.77%
Probability of exploitation in next 30 days
EPSS Percentile
84.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0277 is in the 77th percentile among its peer group of 19,958 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: python-0:2.3.4-14.10.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: python-0:2.4.3-44.el5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: python-0:2.6.6-20.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: python-docs-0:2.6.6-2.el6
View patch

Vendor Advisories (1)

redhatCVE-2010-3493Low

Python: SMTP proxy RFC 2821 module DoS (uncaught exception) (Issue #9129)

Jun 30, 2010

References

bugs.python.org / issue6706
PatchVendor Advisory
bugs.python.org / issue9129
PatchVendor Advisory
lists.opensuse.org / opensuse-security-announce/2010-12/msg00006.html
lists.opensuse.org / opensuse-security-announce/2011-01/msg00006.html
bugs.launchpad.net / zodb/+bug/135108
bugzilla.redhat.com / show_bug.cgi
secunia.com / advisories/43068
secunia.com / advisories/50858
secunia.com / advisories/51024
secunia.com / advisories/51040
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12210
svn.python.org / view/python/branches/py3k/Lib/smtpd.py
Patch
svn.python.org / view
mandriva.com / security/advisories
mandriva.com / security/advisories
openwall.com / lists/oss-security/2010/09/09/6
openwall.com / lists/oss-security/2010/09/11/2
openwall.com / lists/oss-security/2010/09/22/3
openwall.com / lists/oss-security/2010/09/24/3
securityfocus.com / bid/44533
ubuntu.com / usn/USN-1596-1
ubuntu.com / usn/USN-1613-1
ubuntu.com / usn/USN-1613-2
vupen.com / english/advisories/2011/0212