ntp: trusted keys memory corruption vulnerability
Published Aug 7, 2017
8.8
HIGHCVSS 3.1
EPSS 16.85%
Description
Use-after-free vulnerability in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote authenticated users to possibly execute arbitrary code or cause a denial of service (crash) via crafted packets.
Affected products
No data.
Configuration 1
- ≥ 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
- 4.2.8
Configuration 2
- n/a
- n/a
- n/a
- n/a
- n/a
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 as these version do not include the affected code.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:S/C:P/I:P/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 | 16.85% (0.16848) | 96.96th | v5 (v2026.06.15) |
| Jun 15, 2026 | 16.85% (0.16848) | 96.64th | v5 (v2026.06.15) |
| May 13, 2026 | 4.55% (0.04548) | 89.28th | v4 (v2025.03.14) |
| Dec 13, 2025 | 3.31% (0.03311) | 86.84th | v4 (v2025.03.14) |
| Jun 25, 2025 | 4.37% (0.04365) | 88.43th | v4 (v2025.03.14) |
| Mar 30, 2025 | 2.50% (0.02497) | 83.94th | v4 (v2025.03.14) |
| Mar 29, 2025 | 9.86% (0.09858) | 88.23th | v4 (v2025.03.14) |
| Mar 17, 2025 | 3.00% (0.02998) | 85.66th | v4 (v2025.03.14) |
| Dec 17, 2024 | 5.99% (0.05985) | 93.39th | v3 (v2023.03.01) |
| Dec 12, 2024 | 1.17% (0.01166) | 85.58th | v3 (v2023.03.01) |
| Jun 6, 2024 | 1.01% (0.01014) | 83.74th | v3 (v2023.03.01) |
| Jul 18, 2023 | 1.01% (0.01014) | 81.73th | v3 (v2023.03.01) |
| Jun 17, 2023 | 1.00% (0.00995) | 81.43th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.93% (0.00928) | 80.56th | v3 (v2023.03.01) |
| Mar 6, 2023 | 4.18% (0.04180) | 86.11th | v2 (v2022.01.01) |
| May 4, 2022 | 4.18% (0.04180) | 84.83th | v2 (v2022.01.01) |
| Apr 1, 2022 | 4.07% (0.04069) | 84.57th | v2 (v2022.01.01) |
| Feb 4, 2022 | 4.07% (0.04069) | 68.02th | v2 (v2022.01.01) |
References (11)
- http://support.ntp.org/bin/view/Main/NtpBug2916 x_refsource_CONFIRMPatchVendor Advisory
- http://support.ntp.org/bin/view/Main/SecurityNotice#October_2015_NTP_Security_Vulner
- http://talosintel.com/reports/TALOS-2015-0054/
- http://www.securityfocus.com/bid/77276 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1033951 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2015-7849 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1274257 x_refsource_CONFIRMIssue TrackingThird Party AdvisoryVDB Entry
- https://nvd.nist.gov/vuln/detail/CVE-2015-7849
- https://security.gentoo.org/glsa/201607-15 vendor-advisoryx_refsource_GENTOOThird Party AdvisoryVDB Entry
- https://security.netapp.com/advisory/ntap-20171004-0001/ x_refsource_CONFIRMThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2015-7849
| Link | Providers | Tags |
|---|---|---|
| http://support.ntp.org/bin/view/Main/NtpBug2916 | x_refsource_CONFIRMPatchVendor Advisory | |
| http://support.ntp.org/bin/view/Main/SecurityNotice#October_2015_NTP_Security_Vulner | ||
| http://talosintel.com/reports/TALOS-2015-0054/ | ||
| http://www.securityfocus.com/bid/77276 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| http://www.securitytracker.com/id/1033951 | vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry | |
| https://access.redhat.com/security/cve/CVE-2015-7849 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1274257 | x_refsource_CONFIRMIssue TrackingThird Party AdvisoryVDB Entry | |
| https://nvd.nist.gov/vuln/detail/CVE-2015-7849 | ||
| https://security.gentoo.org/glsa/201607-15 | vendor-advisoryx_refsource_GENTOOThird Party AdvisoryVDB Entry | |
| https://security.netapp.com/advisory/ntap-20171004-0001/ | x_refsource_CONFIRMThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2015-7849 |
Change history (0)
No recorded changes yet.