openssh: Prevent connection slot exhaustion attacks
Published Mar 7, 2013
7.5
HIGHCVSS 3.1
EPSS 16.51%
Description
The default configuration of OpenSSH through 6.1 enforces a fixed time limit between establishing a TCP connection and completing a login, which makes it easier for remote attackers to cause a denial of service (connection-slot exhaustion) by periodically making many new TCP connections.
Affected products
No data.
- ≤ 6.1
- 1.2
- 1.2.1
- 1.2.2
- 1.2.3
- 1.2.27
- 1.3
- 1.5
- 1.5.7
- 1.5.8
- 2.1
- 2.1.1
- 2.2
- 2.3
- 2.3.1
- 2.5
- 2.5.1
- 2.5.2
- 2.9
- 2.9.9
- 2.9.9p2
- 2.9p1
- 2.9p2
- 3.0
- 3.0.1
- 3.0.1p1
- 3.0.2
- 3.0.2p1
- 3.0p1
- 3.1
- 3.1p1
- 3.2
- 3.2.2
- 3.2.2p1
- 3.2.3p1
- 3.3
- 3.3p1
- 3.4
- 3.4p1
- 3.5
- 3.5p1
- 3.6
- 3.6.1
- 3.6.1p1
- 3.6.1p2
- 3.7
- 3.7.1
- 3.7.1p1
- 3.7.1p2
- 3.8
- 3.8.1
- 3.8.1p1
- 3.9
- 3.9.1
- 3.9.1p1
- 4.0
- 4.0p1
- 4.1
- 4.1p1
- 4.2
- 4.2p1
- 4.3
- 4.3p1
- 4.3p2
- 4.4
- 4.4p1
- 4.5
- 4.6
- 4.7
- 4.8
- 4.9
- 5.0
- 5.1
- 5.2
- 5.3
- 5.4
- 5.5
- 5.6
- 5.7
- 5.8
- 5.8p2
- 5.9
- 6.0
No data.
RHEV 3.X Hypervisor and Agents for RHEL-6
rhev-hypervisor6-0:6.5-20131115.0.3.2.el6_5
Fixed · RHSA-2013:1527
Red Hat Enterprise Linux 6
openssh-0:5.3p1-94.el6
Fixed · RHSA-2013:1591
Red Hat Enterprise Linux 5
openssh
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| RHEV 3.X Hypervisor and Agents for RHEL-6 | rhev-hypervisor6-0:6.5-20131115.0.3.2.el6_5 | Fixed | RHSA-2013:1527 |
| Red Hat Enterprise Linux 6 | openssh-0:5.3p1-94.el6 | Fixed | RHSA-2013:1591 |
| Red Hat Enterprise Linux 5 | openssh | Will not fix | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Red Hat Enterprise Linux 5 is now in Production 3 Phase of the support and maintenance life cycle. This has been rated as having Low security impact and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed May 29, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 4, 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 (18 key points)
Flat stretches are collapsed. Showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 4, 2026 | 16.51% (0.16510) | 96.91th | v5 (v2026.06.15) |
| Jun 15, 2026 | 16.51% (0.16510) | 96.58th | v5 (v2026.06.15) |
| Oct 1, 2025 | 1.36% (0.01364) | 79.61th | v4 (v2025.03.14) |
| Sep 4, 2025 | 3.19% (0.03186) | 86.48th | v4 (v2025.03.14) |
| Sep 1, 2025 | 1.39% (0.01394) | 79.72th | v4 (v2025.03.14) |
| Aug 4, 2025 | 3.19% (0.03186) | 86.49th | v4 (v2025.03.14) |
| Aug 1, 2025 | 1.39% (0.01394) | 79.68th | v4 (v2025.03.14) |
| Jul 30, 2025 | 3.19% (0.03186) | 86.48th | v4 (v2025.03.14) |
| Jun 19, 2025 | 1.79% (0.01794) | 81.91th | v4 (v2025.03.14) |
| May 1, 2025 | 0.56% (0.00562) | 67.18th | v4 (v2025.03.14) |
| Mar 30, 2025 | 1.79% (0.01794) | 81.13th | v4 (v2025.03.14) |
| Mar 29, 2025 | 3.58% (0.03583) | 79.34th | v4 (v2025.03.14) |
| Mar 17, 2025 | 0.80% (0.00803) | 72.43th | v4 (v2025.03.14) |
| Dec 12, 2024 | 7.87% (0.07870) | 94.51th | v3 (v2023.03.01) |
| Mar 7, 2023 | 7.87% (0.07870) | 93.17th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.17% (0.02172) | 80.77th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.17% (0.02172) | 78.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.17% (0.02172) | 57.73th | v2 (v2022.01.01) |
References (15)
- http://marc.info/?l=bugtraq&m=144050155601375&w=2 vendor-advisoryx_refsource_HP
- http://rhn.redhat.com/errata/RHSA-2013-1591.html vendor-advisoryx_refsource_REDHAT
- http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/servconf.c?r1=1.234#rev1.234 x_refsource_CONFIRM
- http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshd_config.5?r1=1.156#rev1.156 x_refsource_CONFIRM
- http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshd_config?r1=1.89#rev1.89 x_refsource_CONFIRM
- http://www.openwall.com/lists/oss-security/2013/02/07/3 mailing-listx_refsource_MLIST
- http://www.oracle.com/technetwork/topics/security/cpujan2015-1972971.html x_refsource_CONFIRM
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html x_refsource_CONFIRM
- http://www.securityfocus.com/bid/58162 vdb-entryx_refsource_BID
- https://access.redhat.com/security/cve/CVE-2010-5107 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=908707 x_refsource_CONFIRMIssue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2010-5107
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A19515 vdb-entrysignaturex_refsource_OVAL
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A19595 vdb-entrysignaturex_refsource_OVAL
- https://www.cve.org/CVERecord?id=CVE-2010-5107
Change history (0)
No recorded changes yet.