CVE-2016-4921
No exploitation reported by the sources we read.
- Published2017-10-13
- WeaknessCWE-399
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
By flooding a Juniper Networks router running Junos OS with specially crafted IPv6 traffic, all available resources can be consumed, leading to the inability to store next hop information for legitimate traffic. In extreme cases, the crafted IPv6 traffic may result in a total resource exhaustion and kernel panic. The issue is triggered by traffic destined to the router. Transit traffic does not trigger the vulnerability. This issue only affects devices with IPv6 enabled and configured. Devices not configured to process IPv6 traffic are unaffected by this vulnerability. This issue was found during internal product security testing. Juniper SIRT is not aware of any malicious exploitation of this vulnerability. Affected releases are Juniper Networks Junos OS 11.4 prior to 11.4R13-S3; 12.3 prior to 12.3R3-S4; 12.3X48 prior to 12.3X48-D30; 13.3 prior to 13.3R10, 13.3R4-S11; 14.1 prior to 14.1R2-S8, 14.1R4-S12, 14.1R8; 14.1X53 prior to 14.1X53-D28, 14.1X53-D40; 14.1X55 prior to 14.1X55-D35; 14.2 prior to 14.2R3-S10, 14.2R4-S7, 14.2R6; 15.1 prior to 15.1F2-S5, 15.1F5-S2, 15.1F6, 15.1R3; 15.1X49 prior to 15.1X49-D40; 15.1X53 prior to 15.1X53-D57, 15.1X53-D70.
Timeline
dates in UTC- 2017-10-1317:29CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2016-4921?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2016-4921?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 |
|---|---|---|---|
| 11.4 | = 11.4 | no fix published | NVD |
| 11.4 | = 11.4r13 | no fix published | NVD |
| 12.3 | = 12.3 | no fix published | NVD |
| 12.3 | = 12.3x48 | no fix published | NVD |
| 13.3 | = 13.3 | no fix published | NVD |
| 14.1 | = 14.1 | no fix published | NVD |
| 14.1 | = 14.1x53 | no fix published | NVD |
| 14.1 | = 14.1x55 | no fix published | NVD |
| 14.2 | = 14.2 | no fix published | NVD |
| 15.1 | = 15.1 | no fix published | NVD |
| 15.1 | = 15.1x49 | no fix published | NVD |
| 15.1 | = 15.1x53 | no fix published | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
Advisories and patches
- kb.juniper.netVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
- CNACVSS 3.07.5read 2026-10-23
- NVDCVSS 3.07.5read 2026-10-23
- NVDCVSS 2.07.8read 2026-10-23
- NVDweakness (CWE)CWE-399read 2026-10-23
- FIRST EPSSEPSS score2.9 %2026-10-23
Technical details
- CVSS v3 Vector
- CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Published
- 2017-10-13
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2016-4921?
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