Python: SMTP proxy RFC 2821 module DoS (uncaught exception) (Issue #9129)
Published Oct 19, 2010
4.3
MEDIUMCVSS 2.0
EPSS 2.80%
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
No data.
No data.
Red Hat Enterprise Linux 4
python-0:2.3.4-14.10.el4
Fixed · RHSA-2011:0491
Red Hat Enterprise Linux 5
python-0:2.4.3-44.el5
Fixed · RHSA-2011:0492
Red Hat Enterprise Linux 6
python-0:2.6.6-20.el6
Fixed · RHSA-2011:0554
Red Hat Enterprise Linux 6
python-docs-0:2.6.6-2.el6
Fixed · RHSA-2011:0554
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 4 | python-0:2.3.4-14.10.el4 | Fixed | RHSA-2011:0491 |
| Red Hat Enterprise Linux 5 | python-0:2.4.3-44.el5 | Fixed | RHSA-2011:0492 |
| Red Hat Enterprise Linux 6 | python-0:2.6.6-20.el6 | Fixed | RHSA-2011:0554 |
| Red Hat Enterprise Linux 6 | python-docs-0:2.6.6-2.el6 | Fixed | RHSA-2011:0554 |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 2.80% (0.02798) | 85.97th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.77% (0.02774) | 84.42th | v5 (v2026.06.15) |
| Dec 9, 2025 | 2.08% (0.02077) | 83.43th | v4 (v2025.03.14) |
| Mar 30, 2025 | 0.79% (0.00789) | 71.64th | v4 (v2025.03.14) |
| Mar 29, 2025 | 2.54% (0.02537) | 75.71th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.36% (0.01357) | 78.82th | v4 (v2025.03.14) |
| Dec 17, 2024 | 10.41% (0.10406) | 94.98th | v3 (v2023.03.01) |
| Mar 7, 2023 | 11.55% (0.11549) | 94.31th | v3 (v2023.03.01) |
| Mar 6, 2023 | 4.36% (0.04358) | 88.02th | v2 (v2022.01.01) |
| Apr 1, 2022 | 4.36% (0.04358) | 86.83th | v2 (v2022.01.01) |
| Feb 4, 2022 | 4.36% (0.04358) | 70.59th | v2 (v2022.01.01) |
References (27)
- http://bugs.python.org/issue6706 x_refsource_MISCPatchVendor Advisory
- http://bugs.python.org/issue9129 x_refsource_CONFIRMPatchVendor Advisory
- http://lists.opensuse.org/opensuse-security-announce/2010-12/msg00006.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00006.html vendor-advisoryx_refsource_SUSE
- http://secunia.com/advisories/43068 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/50858 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/51024 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/51040 third-party-advisoryx_refsource_SECUNIA
- http://svn.python.org/view/python/branches/py3k/Lib/smtpd.py?r1=84289&r2=84288&pathrev=84289 x_refsource_CONFIRMPatch
- http://svn.python.org/view?view=rev&revision=84289 x_refsource_CONFIRM
- http://www.mandriva.com/security/advisories?name=MDVSA-2010:215 vendor-advisoryx_refsource_MANDRIVA
- http://www.mandriva.com/security/advisories?name=MDVSA-2010:216 vendor-advisoryx_refsource_MANDRIVA
- http://www.openwall.com/lists/oss-security/2010/09/09/6 mailing-listx_refsource_MLIST
- http://www.openwall.com/lists/oss-security/2010/09/11/2 mailing-listx_refsource_MLIST
- http://www.openwall.com/lists/oss-security/2010/09/22/3 mailing-listx_refsource_MLIST
- http://www.openwall.com/lists/oss-security/2010/09/24/3 mailing-listx_refsource_MLIST
- http://www.securityfocus.com/bid/44533 vdb-entryx_refsource_BID
- http://www.ubuntu.com/usn/USN-1596-1 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/USN-1613-1 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/USN-1613-2 vendor-advisoryx_refsource_UBUNTU
- http://www.vupen.com/english/advisories/2011/0212 vdb-entryx_refsource_VUPEN
- https://access.redhat.com/security/cve/CVE-2010-3493 Vendor Advisory
- https://bugs.launchpad.net/zodb/+bug/135108 x_refsource_MISC
- https://bugzilla.redhat.com/show_bug.cgi?id=632200 x_refsource_CONFIRMIssue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2010-3493
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12210 vdb-entrysignaturex_refsource_OVAL
- https://www.cve.org/CVERecord?id=CVE-2010-3493
Change history (0)
No recorded changes yet.