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CVE-2015-3405

21
FAUCET Score

CVE-2015-3405 describes a weakness in the ntp-keygen utility within NTP versions 4.2.8px before 4.2.8p2-RC2 and 4.3.x before 4.3.12, specifically impacting big-endian systems. This vulnerability results in insufficient entropy when generating MD5 keys under specific conditions, affecting products like Debian, Fedora, and Red Hat. With a CVSS score of 7.5 (High), it presents a network-based attack vector with low complexity, allowing remote attackers to potentially brute-force and obtain the generated MD5 keys, leading to a high confidentiality impact. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.2.8:p1:*:*:*:*:*:*
4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.2.8:p2:*:*:*:*:*:*
4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.2.8:p2-rc1:*:*:*:*:*:*
4.3.0CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.3.0:*:*:*:*:*:*:*
4.3.1CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.3.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
5.29%
Probability of exploitation in next 30 days
EPSS Percentile
91.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0529 is in the 86th percentile among its peer group of 51,485 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

redhatpatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: ntp-0:4.2.6p5-5.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: ntp-0:4.2.6p5-22.el7
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: ntp

Vendor Advisories (1)

redhatCVE-2015-3405Low

ntp: ntp-keygen may generate non-random symmetric keys on big-endian systems

Apr 9, 2015

References

bk1.ntp.org / ntp-stable
Third Party AdvisoryVendor Advisory
lists.fedoraproject.org / pipermail/package-announce/2015-April/156248.html
Third Party Advisory
lists.opensuse.org / opensuse-security-announce/2015-07/msg00000.html
Third Party Advisory
rhn.redhat.com / errata/RHSA-2015-1459.html
Third Party AdvisoryVDB Entry
rhn.redhat.com / errata/RHSA-2015-2231.html
Third Party AdvisoryVDB Entry
bugs.ntp.org / show_bug.cgi
Issue TrackingThird Party AdvisoryVendor Advisory
bugzilla.redhat.com / show_bug.cgi
Issue TrackingPatchThird Party AdvisoryVDB Entry
support.hpe.com / hpsc/doc/public/display
debian.org / security/2015/dsa-3223
Third Party Advisory
debian.org / security/2015/dsa-3388
Third Party Advisory
openwall.com / lists/oss-security/2015/04/23/14
Mailing ListThird Party Advisory
oracle.com / technetwork/topics/security/bulletinapr2015-2511959.html
oracle.com / technetwork/topics/security/linuxbulletinoct2015-2719645.html
securityfocus.com / bid/74045
Third Party AdvisoryVDB Entry