MEDIUM
ntp: out-of-bounds references on crafted packet
Published Jan 30, 2017
5.3
MEDIUMCVSS 3.1
EPSS 15.08%
Description
The MATCH_ASSOC function in NTP before version 4.2.8p9 and 4.3.x before 4.3.92 allows remote attackers to cause an out-of-bounds reference via an addpeer request with a large hmode value.
Affected products
No data.
Configuration 1
OR
- < 4.2.8
- ≥ 4.3.0 · < 4.3.92
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
Configuration 2
OR
- 8.0
- 9.0
- 10.0
Configuration 3
OR
- n/a
- n/a
- n/a
- n/a
- n/a
Configuration 4
OR
- 10.0.0
- 10.0.1
- 12.0.0
- 6
- 7
Configuration 5
OR
- 7.0
- 6.0
- 7.0
- 7.2
- 7.4
- 7.6
- 7.2
- 7.3
- 7.4
- 7.5
- 7.6
- 7.7
- 7.2
- 7.3
- 7.6
- 7.7
- 6.0
Configuration 6
OR
- 9.3
- 9.3
- 9.3
- 9.3
- 9.3
- 9.3
- 9.3
- 9.3
- 9.3
- 9.3
- 9.3
- 9.3
- 9.3
- 9.3
- 9.3
- 9.3
- 9.3
- 9.3
- 9.3
- 9.3
- 9.3
- 9.3
- 9.3
- 9.3
- 9.3
- 9.3
- 9.3
- 9.3
- 9.3
- 9.3
- 10.1
- 10.1
- 10.1
- 10.1
- 10.1
- 10.1
- 10.1
- 10.1
- 10.1
- 10.1
- 10.1
- 10.1
- 10.1
- 10.1
- 10.1
- 10.1
- 10.1
- 10.1
- 10.1
- 10.1
- 10.1
- 10.1
- 10.1
- 10.1
- 10.1
- 10.1
- 10.2
- 10.2
- 10.2
- 10.2
- 10.2
- 10.2
- 10.2
- 10.2
- 10.2
- 10.2
- 10.2
- 10.2
- 10.3
Configuration 7
AND
Running on/with
- n/a
No data.
Red Hat Enterprise Linux 6
ntp-0:4.2.6p5-10.el6.1
Fixed · RHSA-2016:1141
Red Hat Enterprise Linux 6.7 Extended Update Support
ntp-0:4.2.6p5-5.el6_7.5
Fixed · RHSA-2016:1552
Red Hat Enterprise Linux 7
ntp-0:4.2.6p5-22.el7_2.2
Fixed · RHSA-2016:1141
Red Hat Enterprise Linux 5
ntp
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | ntp-0:4.2.6p5-10.el6.1 | Fixed | RHSA-2016:1141 |
| Red Hat Enterprise Linux 6.7 Extended Update Support | ntp-0:4.2.6p5-5.el6_7.5 | Fixed | RHSA-2016:1552 |
| Red Hat Enterprise Linux 7 | ntp-0:4.2.6p5-22.el7_2.2 | Fixed | RHSA-2016:1141 |
| Red Hat Enterprise Linux 5 | ntp | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
5.3 MEDIUM NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact None
Availability Impact Low
No CVSS v3.0 score for this CVE.
5.0 MEDIUM NVD
AV:N/AC:L/Au:N/C:N/I:N/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
15.08% 0.15081
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.15081
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 (14 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 15.08% (0.15081) | 96.63th | v5 (v2026.06.15) |
| Jun 15, 2026 | 15.20% (0.15201) | 96.32th | v5 (v2026.06.15) |
| May 3, 2026 | 3.48% (0.03480) | 87.62th | v4 (v2025.03.14) |
| Mar 29, 2026 | 2.04% (0.02043) | 83.76th | v4 (v2025.03.14) |
| Mar 30, 2025 | 1.01% (0.01006) | 75.03th | v4 (v2025.03.14) |
| Mar 29, 2025 | 3.03% (0.03027) | 77.67th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.06% (0.01063) | 76.14th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.41% (0.00407) | 74.61th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.31% (0.00306) | 68.99th | v3 (v2023.03.01) |
| Jan 31, 2024 | 0.31% (0.00306) | 66.77th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.30% (0.00301) | 64.74th | 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) |
Weaknesses (1)
References (38)
- http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183647.html vendor-advisoryx_refsource_FEDORA
- http://lists.fedoraproject.org/pipermail/package-announce/2016-May/184669.html vendor-advisoryx_refsource_FEDORA
- http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00034.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00037.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00052.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00001.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00020.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00026.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00042.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-updates/2016-05/msg00114.html vendor-advisoryx_refsource_SUSE
- http://packetstormsecurity.com/files/136864/Slackware-Security-Advisory-ntp-Updates.html x_refsource_MISC
- http://rhn.redhat.com/errata/RHSA-2016-1552.html vendor-advisoryx_refsource_REDHATBroken Link
- http://support.ntp.org/bin/view/Main/NtpBug3009 x_refsource_CONFIRMVendor Advisory
- http://support.ntp.org/bin/view/Main/SecurityNotice#April_2016_NTP_4_2_8p7_Security
- http://support.ntp.org/bin/view/Main/SecurityNotice#April_2016_ntp_4_2_8p7_Security x_refsource_CONFIRMVendor Advisory
- http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160428-ntpd vendor-advisoryx_refsource_CISCO
- http://www.debian.org/security/2016/dsa-3629 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html x_refsource_CONFIRMPatchThird Party Advisory
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html x_refsource_CONFIRMThird Party Advisory
- http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html x_refsource_CONFIRMThird Party Advisory
- http://www.securityfocus.com/archive/1/538233/100/0/threaded mailing-listx_refsource_BUGTRAQ
- http://www.securityfocus.com/archive/1/archive/1/538233/100/0/threaded mailing-listx_refsource_BUGTRAQ
- http://www.securityfocus.com/bid/88226 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1035705 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- http://www.ubuntu.com/usn/USN-3096-1 vendor-advisoryx_refsource_UBUNTU
- https://access.redhat.com/errata/RHSA-2016:1141 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2016-2518 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1331468 Issue Tracking
- https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf x_refsource_CONFIRMThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2016-2518
- https://security.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.asc vendor-advisoryx_refsource_FREEBSDThird Party Advisory
- https://security.gentoo.org/glsa/201607-15 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://security.netapp.com/advisory/ntap-20171004-0002/ x_refsource_CONFIRMThird Party Advisory
- https://support.f5.com/csp/article/K20804323 x_refsource_CONFIRM
- https://us-cert.cisa.gov/ics/advisories/icsa-21-159-11 x_refsource_MISC
- https://www.cve.org/CVERecord?id=CVE-2016-2518
- https://www.debian.org/security/2016/dsa-3629 vendor-advisoryx_refsource_DEBIAN
- https://www.kb.cert.org/vuls/id/718152 third-party-advisoryx_refsource_CERT-VNThird Party AdvisoryUS Government Resource
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Jan 30, 2017
Updated Aug 5, 2024
Reserved Feb 20, 2016
Link CVE-2016-2518
CISA Vulnrichment
Updated n/a