dhcp: unclosed TCP connections to OMAPI or failover ports can cause DoS
Published Mar 9, 2016
5.9
MEDIUMCVSS 3.1
EPSS 73.62%
Description
ISC DHCP 4.1.x before 4.1-ESV-R13 and 4.2.x and 4.3.x before 4.3.4 does not restrict the number of concurrent TCP sessions, which allows remote attackers to cause a denial of service (INSIST assertion failure or request-processing outage) by establishing many sessions.
Affected products
No data.
Configuration 1
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1.0
- 4.1.0
- 4.1.0
- 4.1.0
- 4.1.1
- 4.1.1
- 4.1.1
- 4.1.1
- 4.1.1
- 4.1.1
- 4.1.2
- 4.1.2
- 4.1.2
- 4.1.2
- 4.2.0
- 4.2.0
- 4.2.0
- 4.2.0
- 4.2.0
- 4.2.0
- 4.2.0
- 4.2.0
- 4.2.1
- 4.2.1
- 4.2.1
- 4.2.1
- 4.2.2
- 4.2.2
- 4.2.2
- 4.2.3
- 4.2.3
- 4.2.3
- 4.2.4
- 4.2.4
- 4.2.4
- 4.2.4
- 4.2.4
- 4.2.4
- 4.2.5
- 4.2.5
- 4.2.5
- 4.2.5
- 4.2.6
- 4.2.6
- 4.2.6
- 4.2.7
- 4.2.7
- 4.2.7
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.3.0
- 4.3.0
- 4.3.0
- 4.3.0
- 4.3.1
- 4.3.1
- 4.3.1
- 4.3.2
- 4.3.2
- 4.3.2
- 4.3.2
- 4.3.3
- 4.3.3
Configuration 2
- 8.0
Configuration 3
- 14.04
- 16.04
- 17.10
No data.
Red Hat Enterprise Linux 7
dhcp-12:4.2.5-47.el7
Fixed · RHSA-2016:2590
Red Hat Enterprise Linux 5
dhcp
Will not fix
Red Hat Enterprise Linux 6
dhcp
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | dhcp-12:4.2.5-47.el7 | Fixed | RHSA-2016:2590 |
| Red Hat Enterprise Linux 5 | dhcp | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | dhcp | Will not fix | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:N/I:N/A:C
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 1, 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 (17 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 73.62% (0.73622) | 99.46th | v5 (v2026.06.15) |
| Jun 15, 2026 | 73.70% (0.73703) | 99.40th | v5 (v2026.06.15) |
| Mar 26, 2026 | 65.58% (0.65582) | 98.48th | v4 (v2025.03.14) |
| Feb 20, 2026 | 56.98% (0.56982) | 98.08th | v4 (v2025.03.14) |
| Feb 18, 2026 | 63.36% (0.63360) | 98.36th | v4 (v2025.03.14) |
| Dec 1, 2025 | 65.58% (0.65582) | 98.42th | v4 (v2025.03.14) |
| Jul 13, 2025 | 69.96% (0.69959) | 98.58th | v4 (v2025.03.14) |
| Jul 10, 2025 | 63.21% (0.63212) | 98.28th | v4 (v2025.03.14) |
| Jul 9, 2025 | 58.03% (0.58026) | 98.05th | v4 (v2025.03.14) |
| Jun 12, 2025 | 63.21% (0.63212) | 98.26th | v4 (v2025.03.14) |
| Jun 8, 2025 | 53.52% (0.53519) | 97.81th | v4 (v2025.03.14) |
| Mar 17, 2025 | 46.01% (0.46006) | 97.34th | v4 (v2025.03.14) |
| Dec 17, 2024 | 20.94% (0.20938) | 96.39th | v3 (v2023.03.01) |
| Mar 7, 2023 | 92.17% (0.92174) | 98.36th | v3 (v2023.03.01) |
| Mar 6, 2023 | 4.71% (0.04711) | 89.20th | v2 (v2022.01.01) |
| Apr 1, 2022 | 4.71% (0.04711) | 88.11th | v2 (v2022.01.01) |
| Feb 4, 2022 | 4.71% (0.04711) | 74.48th | v2 (v2022.01.01) |
References (14)
- http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183458.html vendor-advisoryx_refsource_FEDORAThird Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183640.html vendor-advisoryx_refsource_FEDORAThird Party Advisory
- http://lists.opensuse.org/opensuse-updates/2016-07/msg00066.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2016-2590.html vendor-advisoryx_refsource_REDHATThird Party Advisory
- http://www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.html x_refsource_CONFIRMThird Party Advisory
- http://www.securityfocus.com/bid/84208 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1035196 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2016-2774 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1315259 Issue Tracking
- https://kb.isc.org/article/AA-01354 x_refsource_CONFIRMVendor Advisory
- https://lists.debian.org/debian-lts-announce/2019/11/msg00023.html mailing-listx_refsource_MLISTThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2016-2774
- https://usn.ubuntu.com/3586-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2016-2774
Change history (0)
No recorded changes yet.