ntp: vallen in extension fields are not validated
Published Oct 4, 2015
5.8
MEDIUMCVSS 2.0
EPSS 6.13%
Description
ntp_crypto.c in ntpd in NTP 4.x before 4.2.8p1, when Autokey Authentication is enabled, allows remote attackers to obtain sensitive information from process memory or cause a denial of service (daemon crash) via a packet containing an extension field with an invalid value for the length of its value field.
Affected products
No data.
Configuration 2
- 6.0
- 6.0
- 6.0
Configuration 3
- 7.0
- 8.0
- 9.0
No data.
Red Hat Enterprise Linux 6
ntp-0:4.2.6p5-5.el6
Fixed · RHSA-2015:1459
Red Hat Enterprise Linux 7
ntp-0:4.2.6p5-22.el7
Fixed · RHSA-2015:2231
Red Hat Enterprise Linux 5
ntp
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | ntp-0:4.2.6p5-5.el6 | Fixed | RHSA-2015:1459 |
| Red Hat Enterprise Linux 7 | ntp-0:4.2.6p5-22.el7 | Fixed | RHSA-2015:2231 |
| Red Hat Enterprise Linux 5 | ntp | Will not fix | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue affects the versions of ntp as shipped with Red Hat Enterprise Linux 5. 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/. A mitigation for Red Hat Enterprise Linux 6 and 7 is available at: https://bugzilla.redhat.com/show_bug.cgi?id=1184573#c16
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:P/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 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 (18 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 6.13% (0.06135) | 93.23th | v5 (v2026.06.15) |
| Jun 15, 2026 | 6.16% (0.06158) | 92.54th | v5 (v2026.06.15) |
| Jan 10, 2026 | 4.43% (0.04426) | 88.68th | v4 (v2025.03.14) |
| Dec 28, 2025 | 7.26% (0.07260) | 91.33th | v4 (v2025.03.14) |
| Dec 27, 2025 | 10.16% (0.10156) | 92.90th | v4 (v2025.03.14) |
| Dec 13, 2025 | 7.24% (0.07238) | 91.27th | v4 (v2025.03.14) |
| Aug 10, 2025 | 10.16% (0.10156) | 92.79th | v4 (v2025.03.14) |
| Jun 21, 2025 | 11.50% (0.11502) | 93.27th | v4 (v2025.03.14) |
| Mar 30, 2025 | 15.71% (0.15705) | 94.14th | v4 (v2025.03.14) |
| Mar 29, 2025 | 25.06% (0.25063) | 93.82th | v4 (v2025.03.14) |
| Mar 17, 2025 | 15.71% (0.15705) | 94.21th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.97% (0.00966) | 83.99th | v3 (v2023.03.01) |
| May 22, 2024 | 0.97% (0.00966) | 83.31th | v3 (v2023.03.01) |
| Jul 27, 2023 | 0.97% (0.00966) | 81.29th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.83% (0.00835) | 79.43th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.97% (0.01974) | 78.97th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.97% (0.01974) | 77.12th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.97% (0.01974) | 56.20th | v2 (v2022.01.01) |
References (13)
- http://bugs.ntp.org/show_bug.cgi?id=2671 x_refsource_CONFIRMIssue TrackingPatchVendor Advisory
- http://rhn.redhat.com/errata/RHSA-2015-1459.html vendor-advisoryx_refsource_REDHATThird Party Advisory
- http://support.ntp.org/bin/view/Main/SecurityNotice#December_2014_NTP_Security_Vulne x_refsource_CONFIRMRelease NotesVendor Advisory
- http://support.ntp.org/bin/view/Main/SecurityNotice#vallen_is_not_validated_in_sever
- http://www.debian.org/security/2015/dsa-3388 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- http://www.kb.cert.org/vuls/id/852879 third-party-advisoryx_refsource_CERT-VNThird Party AdvisoryUS Government Resource
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html x_refsource_CONFIRMThird Party Advisory
- http://www.securityfocus.com/bid/72583 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2014-9750 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1184573 x_refsource_CONFIRMIssue TrackingPatchThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2014-9750
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03886en_us x_refsource_CONFIRMThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2014-9750
Change history (0)
No recorded changes yet.