HOME VULNERABILITIESCVE-2015-3405

HIGH

CVE-2015-3405

CWE-331Published: August 9, 2017· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official 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.

Technical Analysis

CVE-2015-3405 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Affected Vendors & Products

Debian1 product(s)

debian linux

Fedora1 product(s)

fedora

ntp1 product(s)

ntp

openSUSE1 product(s)

suse linux enterprise server

opensuse_project1 product(s)

suse linux enterprise desktop

Red Hat7 product(s)

enterprise linux desktopenterprise linux for ibm z systemsenterprise linux for power big endianenterprise linux for scientific computingenterprise linux serverenterprise linux server from rhui 6enterprise linux workstation

SUSE1 product(s)

suse linux enterprise server

Source: NVD CPE · 26 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=1210324

PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=1210324

ADVISORYhttp://bk1.ntp.org/ntp-stable/?PAGE=patch&REV=55199296N2gFqH1Hm5GOnhrk9Ypygg

ADVISORYhttp://lists.fedoraproject.org/pipermail/package-announce/2015-April/156248.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2015-07/msg00000.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2015-1459.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2015-2231.html

ADVISORYhttp://www.debian.org/security/2015/dsa-3223

ADVISORYhttp://www.debian.org/security/2015/dsa-3388

ADVISORYhttp://www.openwall.com/lists/oss-security/2015/04/23/14

ADVISORYhttp://www.securityfocus.com/bid/74045

ADVISORYhttps://bugs.ntp.org/show_bug.cgi?id=2797

ADVISORYhttp://bk1.ntp.org/ntp-stable/?PAGE=patch&REV=55199296N2gFqH1Hm5GOnhrk9Ypygg

ADVISORYhttp://lists.fedoraproject.org/pipermail/package-announce/2015-April/156248.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2015-07/msg00000.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2015-1459.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2015-2231.html

ADVISORYhttp://www.debian.org/security/2015/dsa-3223

ADVISORYhttp://www.debian.org/security/2015/dsa-3388

ADVISORYhttp://www.openwall.com/lists/oss-security/2015/04/23/14

ADVISORYhttp://www.securityfocus.com/bid/74045

ADVISORYhttps://bugs.ntp.org/show_bug.cgi?id=2797

All References (28)

→

http://bk1.ntp.org/ntp-stable/?PAGE=patch&REV=55199296N2gFqH1Hm5GOnhrk9YpyggThird Party Advisory · Vendor Advisory

→

http://lists.fedoraproject.org/pipermail/package-announce/2015-April/156248.htmlThird Party Advisory

→

http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00000.htmlThird Party Advisory

→

http://rhn.redhat.com/errata/RHSA-2015-1459.htmlThird Party Advisory · VDB Entry

→

http://rhn.redhat.com/errata/RHSA-2015-2231.htmlThird Party Advisory · VDB Entry

→

http://www.debian.org/security/2015/dsa-3223Third Party Advisory

→

http://www.debian.org/security/2015/dsa-3388Third Party Advisory

→

http://www.openwall.com/lists/oss-security/2015/04/23/14Mailing List · Third 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/74045Third Party Advisory · VDB Entry

→

https://bugs.ntp.org/show_bug.cgi?id=2797Issue Tracking · Third Party Advisory · Vendor Advisory

→

https://bugzilla.redhat.com/show_bug.cgi?id=1210324Issue Tracking · Patch · Third Party Advisory · VDB 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=55199296N2gFqH1Hm5GOnhrk9YpyggThird Party Advisory · Vendor Advisory

Quick Facts

CVE IDCVE-2015-3405

CVSS Score7.5 / 10

SeverityHIGH

WeaknessCWE-331

CISA KEVNo

Affected7 vendor(s)

PublishedAug 9, 2017

Related CVEs (CWE-331)

CVE-2018-1000620

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2015-3405 in threat intel feeds
→Review IDS/IPS signatures for exploitation attempts

Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.

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