ntp: saveconfig directory traversal vulnerability
Published Jan 28, 2020
6.5
MEDIUMCVSS 3.1
EPSS 3.94%
Description
Directory traversal vulnerability in the save_config function in ntpd in ntp_control.c in NTP before 4.2.8p4, when used on systems that do not use '\' or '/' characters for directory separation such as OpenVMS, allows remote authenticated users to overwrite arbitrary files.
Affected products
No data.
- ≥ 4.2.0 · < 4.2.8
- ≥ 4.3.0 · < 4.3.77
- 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
No data.
Red Hat Enterprise Linux 5
ntp
Not affected
Red Hat Enterprise Linux 6
ntp
Not affected
Red Hat Enterprise Linux 7
ntp
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | ntp | Not affected | n/a |
| Red Hat Enterprise Linux 6 | ntp | Not affected | n/a |
| Red Hat Enterprise Linux 7 | ntp | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect the versions of ntp as shipped with Red Hat Enterprise Linux 5, 6, and 7. This issue only affected OpenVMS operating systems, which use characters other than "/" and "\" for directory separation, allowing exploitation of this flaw.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:S/C:N/I:P/A:N
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 (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.94% (0.03942) | 90.07th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.94% (0.03942) | 89.02th | v5 (v2026.06.15) |
| Mar 17, 2025 | 1.06% (0.01065) | 76.15th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.18% (0.00184) | 57.02th | v3 (v2023.03.01) |
| Jun 27, 2024 | 0.18% (0.00184) | 55.93th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.18% (0.00184) | 53.92th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.06% (0.01061) | 52.82th | v2 (v2022.01.01) |
| Sep 19, 2022 | 1.06% (0.01061) | 51.19th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.06% (0.01061) | 49.19th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.06% (0.01061) | 28.23th | v2 (v2022.01.01) |
References (9)
- http://support.ntp.org/bin/view/Main/NtpBug2918 x_refsource_MISCVendor Advisory
- http://support.ntp.org/bin/view/Main/SecurityNotice x_refsource_MISCRelease NotesVendor Advisory
- http://support.ntp.org/bin/view/Main/SecurityNotice#October_2015_NTP_Security_Vulner
- http://talosintel.com/reports/TALOS-2015-0062/
- http://www.talosintel.com/reports/TALOS-2015-0062/ x_refsource_MISCExploitThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2015-7851 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1274260 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2015-7851
- https://www.cve.org/CVERecord?id=CVE-2015-7851
| Link | Providers | Tags |
|---|---|---|
| http://support.ntp.org/bin/view/Main/NtpBug2918 | x_refsource_MISCVendor Advisory | |
| http://support.ntp.org/bin/view/Main/SecurityNotice | x_refsource_MISCRelease NotesVendor Advisory | |
| http://support.ntp.org/bin/view/Main/SecurityNotice#October_2015_NTP_Security_Vulner | ||
| http://talosintel.com/reports/TALOS-2015-0062/ | ||
| http://www.talosintel.com/reports/TALOS-2015-0062/ | x_refsource_MISCExploitThird Party Advisory | |
| https://access.redhat.com/security/cve/CVE-2015-7851 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1274260 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2015-7851 | ||
| https://www.cve.org/CVERecord?id=CVE-2015-7851 |
Change history (0)
No recorded changes yet.