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CVE-2016-4921

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.

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 7.5, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts and availability (service disruption) for affected systems. Impacting 1 product from juniper organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2017, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.

Published

2017-10-13T17:29:00.270

Last Modified

2026-06-17T00:48:26.757

Status

Modified

Source

[email protected]

Severity

CVSSv3.0: 7.5 (HIGH)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: COMPLETE

Exploitability Score

10.0

Impact Score

6.9

Weaknesses

Type: Primary
CWE-399

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	juniper	junos	11.4	Yes
Operating System	juniper	junos	11.4	Yes
Operating System	juniper	junos	11.4	Yes
Operating System	juniper	junos	11.4	Yes
Operating System	juniper	junos	11.4	Yes
Operating System	juniper	junos	11.4	Yes
Operating System	juniper	junos	11.4	Yes
Operating System	juniper	junos	11.4	Yes
Operating System	juniper	junos	11.4	Yes
Operating System	juniper	junos	11.4	Yes
Operating System	juniper	junos	11.4	Yes
Operating System	juniper	junos	11.4	Yes
Operating System	juniper	junos	11.4	Yes
Operating System	juniper	junos	11.4r13	Yes
Operating System	juniper	junos	12.3	Yes
Operating System	juniper	junos	12.3	Yes
Operating System	juniper	junos	12.3	Yes
Operating System	juniper	junos	12.3	Yes
Operating System	juniper	junos	12.3x48	Yes
Operating System	juniper	junos	12.3x48	Yes
Operating System	juniper	junos	12.3x48	Yes
Operating System	juniper	junos	13.3	Yes
Operating System	juniper	junos	13.3	Yes
Operating System	juniper	junos	13.3	Yes
Operating System	juniper	junos	13.3	Yes
Operating System	juniper	junos	13.3	Yes
Operating System	juniper	junos	13.3	Yes
Operating System	juniper	junos	13.3	Yes
Operating System	juniper	junos	13.3	Yes
Operating System	juniper	junos	13.3	Yes
Operating System	juniper	junos	13.3	Yes
Operating System	juniper	junos	13.3	Yes
Operating System	juniper	junos	13.3	Yes
Operating System	juniper	junos	14.1	Yes
Operating System	juniper	junos	14.1	Yes
Operating System	juniper	junos	14.1	Yes
Operating System	juniper	junos	14.1	Yes
Operating System	juniper	junos	14.1	Yes
Operating System	juniper	junos	14.1x53	Yes
Operating System	juniper	junos	14.1x53	Yes
Operating System	juniper	junos	14.1x53	Yes
Operating System	juniper	junos	14.1x53	Yes
Operating System	juniper	junos	14.1x53	Yes
Operating System	juniper	junos	14.1x53	Yes
Operating System	juniper	junos	14.1x55	Yes
Operating System	juniper	junos	14.1x55	Yes
Operating System	juniper	junos	14.2	Yes
Operating System	juniper	junos	14.2	Yes
Operating System	juniper	junos	14.2	Yes
Operating System	juniper	junos	14.2	Yes
Operating System	juniper	junos	14.2	Yes
Operating System	juniper	junos	15.1	Yes
Operating System	juniper	junos	15.1	Yes
Operating System	juniper	junos	15.1	Yes
Operating System	juniper	junos	15.1	Yes
Operating System	juniper	junos	15.1	Yes
Operating System	juniper	junos	15.1x49	Yes
Operating System	juniper	junos	15.1x49	Yes
Operating System	juniper	junos	15.1x49	Yes
Operating System	juniper	junos	15.1x49	Yes
Operating System	juniper	junos	15.1x53	Yes
Operating System	juniper	junos	15.1x53	Yes
Operating System	juniper	junos	15.1x53	Yes
Operating System	juniper	junos	15.1x53	Yes
Operating System	juniper	junos	15.1x53	Yes
Operating System	juniper	junos	15.1x53	Yes
Operating System	juniper	junos	15.1x53	Yes
Operating System	juniper	junos	15.1x53	Yes
Operating System	juniper	junos	15.1x53	Yes
Operating System	juniper	junos	15.1x53	Yes
Operating System	juniper	junos	15.1x53	Yes

References

http://www.securityfocus.com/bid/93532 Third Party Advisory, VDB Entry ([email protected])
http://www.securitytracker.com/id/1037014 Third Party Advisory, VDB Entry ([email protected])
https://kb.juniper.net/JSA10762 Vendor Advisory ([email protected])
http://www.securityfocus.com/bid/93532 Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
http://www.securitytracker.com/id/1037014 Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
https://kb.juniper.net/JSA10762 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For juniper's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.