ntp: ntp-keygen may generate non-random symmetric keys on big-endian systems
Published Aug 9, 2017
7.5
HIGHCVSS 3.0
EPSS 5.29%
Description
ntp-keygen in ntp 4.2.8px before 4.2.8p2-RC2 and 4.3.x before 4.3.12 does not generate MD5 keys with sufficient entropy on big endian machines when the lowest order byte of the temp variable is between 0x20 and 0x7f and not #, which might allow remote attackers to obtain the value of generated MD5 keys via a brute force attack with the 93 possible keys.
Affected products
No data.
Configuration 1
- 4.2.8
- 4.2.8
- 4.2.8
- 4.3.0
- 4.3.1
- 4.3.2
- 4.3.3
- 4.3.4
- 4.3.5
- 4.3.6
- 4.3.7
- 4.3.8
- 4.3.9
- 4.3.10
- 4.3.11
Configuration 2
- 7.0
- 8.0
Configuration 3
- 11.0
- 11.0
- 11.0
Configuration 4
- 21
Configuration 5
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
- 6.0
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/.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
AV:N/AC:L/Au:N/C:P/I:N/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 (19 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 5.29% (0.05292) | 92.32th | v5 (v2026.06.15) |
| Jun 15, 2026 | 5.29% (0.05292) | 91.50th | v5 (v2026.06.15) |
| Dec 28, 2025 | 16.56% (0.16556) | 94.69th | v4 (v2025.03.14) |
| Dec 27, 2025 | 6.21% (0.06205) | 90.60th | v4 (v2025.03.14) |
| Dec 15, 2025 | 16.56% (0.16556) | 94.67th | v4 (v2025.03.14) |
| Dec 14, 2025 | 18.17% (0.18171) | 94.95th | v4 (v2025.03.14) |
| Dec 13, 2025 | 15.48% (0.15479) | 94.41th | v4 (v2025.03.14) |
| Mar 30, 2025 | 6.21% (0.06205) | 89.92th | v4 (v2025.03.14) |
| Mar 29, 2025 | 5.16% (0.05160) | 82.76th | v4 (v2025.03.14) |
| Mar 17, 2025 | 6.21% (0.06205) | 90.16th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.29% (0.00295) | 70.09th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.29% (0.00295) | 68.40th | v3 (v2023.03.01) |
| Nov 13, 2023 | 0.29% (0.00295) | 65.84th | v3 (v2023.03.01) |
| May 8, 2023 | 0.41% (0.00412) | 70.08th | v3 (v2023.03.01) |
| Mar 29, 2023 | 0.76% (0.00762) | 78.43th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.70% (0.00701) | 77.22th | v3 (v2023.03.01) |
| Mar 6, 2023 | 3.78% (0.03779) | 85.48th | v2 (v2022.01.01) |
| Apr 1, 2022 | 3.78% (0.03779) | 84.01th | v2 (v2022.01.01) |
| Feb 4, 2022 | 3.78% (0.03779) | 67.21th | v2 (v2022.01.01) |
References (17)
- http://bk1.ntp.org/ntp-stable/?PAGE=patch&REV=55199296N2gFqH1Hm5GOnhrk9Ypygg x_refsource_CONFIRMThird Party AdvisoryVendor Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2015-April/156248.html vendor-advisoryx_refsource_FEDORAThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00000.html vendor-advisoryx_refsource_SUSEThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2015-1459.html vendor-advisoryx_refsource_REDHATThird Party AdvisoryVDB Entry
- http://rhn.redhat.com/errata/RHSA-2015-2231.html vendor-advisoryx_refsource_REDHATThird Party AdvisoryVDB Entry
- http://www.debian.org/security/2015/dsa-3223 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- http://www.debian.org/security/2015/dsa-3388 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- http://www.openwall.com/lists/oss-security/2015/04/23/14 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://www.oracle.com/technetwork/topics/security/bulletinapr2015-2511959.html x_refsource_CONFIRM
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html x_refsource_CONFIRM
- http://www.securityfocus.com/bid/74045 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2015-3405 Vendor Advisory
- https://bugs.ntp.org/show_bug.cgi?id=2797 x_refsource_CONFIRMIssue TrackingThird Party AdvisoryVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1210324 x_refsource_CONFIRMIssue TrackingPatchThird Party AdvisoryVDB Entry
- https://nvd.nist.gov/vuln/detail/CVE-2015-3405
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03886en_us x_refsource_CONFIRM
- https://www.cve.org/CVERecord?id=CVE-2015-3405
Change history (0)
No recorded changes yet.