CVE-2015-3405
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…
- 7.5HighCVSS base score
- 5.3%Exploitation in 30 daysEPSS · top 7.4% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By redhat
- 2 years later
· 2 years later
Published
- 7 years later
· 7 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | High7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 5.3% · top 7.4% of all CVEs (10 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
n/a
- affected n/a
References
14
- FEDORA-2015-5830 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- RHSA-2015:2231 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- https://bugzilla.redhat.com/show_bug.cgi?id=1210324 (opens in a new tab)x_refsource_CONFIRMx_transferred
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- DSA-3388 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- SUSE-SU-2015:1173 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- 74045 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- http://www.oracle.com/technetwork/topics/security/bulletinapr2015-2511959.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://bugs.ntp.org/show_bug.cgi?id=2797 (opens in a new tab)x_refsource_CONFIRMx_transferred
- RHSA-2015:1459 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03886en_us (opens in a new tab)x_refsource_CONFIRMx_transferred
- http://bk1.ntp.org/ntp-stable/?PAGE=patch&REV=55199296N2gFqH1Hm5GOnhrk9Ypygg (opens in a new tab)x_refsource_CONFIRMx_transferred
- DSA-3223 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- [oss-security] 20150423 Re: CVE request: ntp-keygen may generate non-random symmetric keys on big-endian systems (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2015-3449 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2015-3405)Record last updated .