CVE-2015-3405
No exploitation reported by the sources we read.
- Published2017-08-09
- WeaknessCWE-331
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
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
dates in UTC- 2017-08-0916:29CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2015-3405?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2015-3405?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 4.2 | = 4.2.8 | no fix published | NVD |
| 4.3 | = 4.3.0 | no fix published | NVD |
| 4.3 | = 4.3.1 | no fix published | NVD |
| 4.3 | = 4.3.2 | no fix published | NVD |
| 4.3 | = 4.3.3 | no fix published | NVD |
| 4.3 | = 4.3.4 | no fix published | NVD |
| 4.3 | = 4.3.5 | no fix published | NVD |
| 4.3 | = 4.3.6 | no fix published | NVD |
| 4.3 | = 4.3.7 | no fix published | NVD |
| 4.3 | = 4.3.8 | no fix published | NVD |
| 4.3 | = 4.3.9 | no fix published | NVD |
| 4.3 | = 4.3.10 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 7.0 | = 7.0 | no fix published | NVD |
| 8.0 | = 8.0 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 21.x | = 21 | no fix published | NVD |
10 more products in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
Advisories and patches
- bk1.ntp.orgVendor Advisory
- bugs.ntp.orgVendor Advisory
- bugzilla.redhat.comPatch
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
- NVDCVSS 3.07.5read 2026-10-23
- NVDCVSS 2.05read 2026-10-23
- NVDweakness (CWE)CWE-331read 2026-10-23
- FIRST EPSSEPSS score5.3 %2026-10-22
Technical details
- CVSS v3 Vector
- CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Published
- 2017-08-09
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2015-3405?
Is CVE-2015-3405 actively exploited?
What is the CVSS score for CVE-2015-3405?
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