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Vulnerability record · CVE-2015-3405 · published 9 August 2017

CVE-2015-3405: Ntp vulnerability

Ntp · Ntp

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.

7.5 CVSS 3.0 High EPSS 5.3% · top 7.7% CWE-331 · CWE-331
7.5CVSS 3.0 base score, v2 5.0
5.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
13Affected product versions listed by NVD
28References
17 Jun 2026Last modified by NVD

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.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

13 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://bk1.ntp.org/ntp-stable/?PAGE=patch&REV=55199296N2gFqH1Hm5GOnhrk9Ypygg Third Party AdvisoryVendor Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2015-April/156248.html Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00000.html Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2015-1459.html Third Party AdvisoryVDB Entry
http://rhn.redhat.com/errata/RHSA-2015-2231.html Third Party AdvisoryVDB Entry
http://www.debian.org/security/2015/dsa-3223 Third Party Advisory
http://www.debian.org/security/2015/dsa-3388 Third Party Advisory
http://www.openwall.com/lists/oss-security/2015/04/23/14 Mailing ListThird Party Advisory
http://www.oracle.com/technetwork/topics/security/bulletinapr2015-2511959.html
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
http://www.securityfocus.com/bid/74045 Third Party AdvisoryVDB Entry
https://bugs.ntp.org/show_bug.cgi?id=2797 Issue TrackingThird Party AdvisoryVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1210324 Issue TrackingPatchThird Party AdvisoryVDB Entry
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03886en_us
http://bk1.ntp.org/ntp-stable/?PAGE=patch&REV=55199296N2gFqH1Hm5GOnhrk9Ypygg Third Party AdvisoryVendor Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2015-April/156248.html Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00000.html Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2015-1459.html Third Party AdvisoryVDB Entry
http://rhn.redhat.com/errata/RHSA-2015-2231.html Third Party AdvisoryVDB Entry
http://www.debian.org/security/2015/dsa-3223 Third Party Advisory
http://www.debian.org/security/2015/dsa-3388 Third Party Advisory
http://www.openwall.com/lists/oss-security/2015/04/23/14 Mailing ListThird Party Advisory
http://www.oracle.com/technetwork/topics/security/bulletinapr2015-2511959.html
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
http://www.securityfocus.com/bid/74045 Third Party AdvisoryVDB Entry
https://bugs.ntp.org/show_bug.cgi?id=2797 Issue TrackingThird Party AdvisoryVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1210324 Issue TrackingPatchThird Party AdvisoryVDB Entry
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03886en_us

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Source: NIST National Vulnerability Database (record CVE-2015-3405), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.