MEDIUM
ntp: libntp message digest disclosure
Published Jan 6, 2017
5.3
MEDIUMCVSS 3.0
EPSS 3.63%
Description
An exploitable vulnerability exists in the message authentication functionality of libntp in ntp 4.2.8p4 and NTPSec a5fb34b9cc89b92a8fef2f459004865c93bb7f92. An attacker can send a series of crafted messages to attempt to recover the message digest key.
Affected products
-
- Version 4.2.8p3StatusaffectedConstraints-
- Version 4.2.8p4StatusaffectedConstraints-
- Version
-
- Version StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| NTP Project | NTP | n/a |
| |||||||||
| NTPsec Project | NTPSec | 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
Will not fix
| 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 | 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.
No CVSS v3.1 score for this CVE.
5.3 MEDIUM NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact Low
Integrity Impact None
Availability Impact None
5.0 MEDIUM NVD
AV:N/AC:L/Au:N/C:P/I:N/A:N
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact Partial
Integrity Impact None
Availability Impact None
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
3.63% 0.03634
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.03634
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 (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.63% (0.03634) | 89.18th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.63% (0.03634) | 88.04th | v5 (v2026.06.15) |
| Dec 28, 2025 | 3.25% (0.03248) | 86.73th | v4 (v2025.03.14) |
| Dec 27, 2025 | 1.67% (0.01665) | 81.69th | v4 (v2025.03.14) |
| Dec 20, 2025 | 3.25% (0.03248) | 86.72th | v4 (v2025.03.14) |
| Mar 30, 2025 | 1.67% (0.01673) | 80.44th | v4 (v2025.03.14) |
| Mar 29, 2025 | 3.67% (0.03665) | 79.56th | v4 (v2025.03.14) |
| Mar 17, 2025 | 2.23% (0.02226) | 83.35th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.49% (0.00493) | 76.95th | v3 (v2023.03.01) |
| Feb 29, 2024 | 0.49% (0.00493) | 75.58th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.44% (0.00436) | 73.98th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.44% (0.00436) | 70.71th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.69% (0.02686) | 82.85th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.69% (0.02686) | 81.17th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.69% (0.02686) | 62.66th | v2 (v2022.01.01) |
Weaknesses (1)
References (40)
- 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_REDHAT
- http://support.ntp.org/bin/view/Main/SecurityNotice#April_2016_NTP_4_2_8p7_Security
- 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_DEBIAN
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html x_refsource_CONFIRM
- http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html x_refsource_CONFIRM
- 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/88261 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id/1035705 vdb-entryx_refsource_SECTRACK
- http://www.talosintel.com/reports/TALOS-2016-0084/
- http://www.talosintelligence.com/reports/TALOS-2016-0084/ x_refsource_MISCTechnical DescriptionThird Party Advisory
- http://www.ubuntu.com/usn/USN-3096-1 vendor-advisoryx_refsource_UBUNTU
- https://access.redhat.com/errata/RHSA-2016:1141 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2016-1550 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1331464 Issue Tracking
- https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf x_refsource_CONFIRM
- https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2016-1550
- https://security.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.asc vendor-advisoryx_refsource_FREEBSD
- https://security.gentoo.org/glsa/201607-15 vendor-advisoryx_refsource_GENTOO
- https://security.netapp.com/advisory/ntap-20171004-0002/ x_refsource_CONFIRM
- https://us-cert.cisa.gov/ics/advisories/icsa-21-103-11 x_refsource_MISC
- https://us-cert.cisa.gov/ics/advisories/icsa-21-159-11 x_refsource_MISC
- https://www.arista.com/en/support/advisories-notices/security-advisories/1332-security-advisory-19 x_refsource_MISC
- https://www.cve.org/CVERecord?id=CVE-2016-1550
- 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-VN
- https://www.talosintelligence.com/vulnerability_reports/TALOS-2016-0084 x_refsource_MISC
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner certcc
Published Jan 6, 2017
Updated Aug 5, 2024
Reserved Jan 7, 2016
Link CVE-2016-1550
CISA Vulnrichment
Updated n/a