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CVE-2016-4921

24
FAUCET Score

CVE-2016-4921 is a denial-of-service vulnerability affecting Juniper Networks routers running Junos OS with IPv6 enabled. An unauthenticated attacker can flood the router with specially crafted IPv6 traffic, consuming all available resources and preventing legitimate traffic from being processed, potentially leading to a kernel panic. Rated 7.5 HIGH (CVSSv3), this vulnerability has a network attack vector with low complexity and high impact on availability. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
11.4CPE matchmatch criteria
cpe:2.3:o:juniper:junos:11.4:*:*:*:*:*:*:*
11.4CPE matchmatch criteria
cpe:2.3:o:juniper:junos:11.4:r1:*:*:*:*:*:*
11.4CPE matchmatch criteria
cpe:2.3:o:juniper:junos:11.4:r10:*:*:*:*:*:*
11.4CPE matchmatch criteria
cpe:2.3:o:juniper:junos:11.4:r11:*:*:*:*:*:*
11.4CPE matchmatch criteria
cpe:2.3:o:juniper:junos:11.4:r12:*:*:*:*:*:*

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:N/I:N/A:H

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

Exploit Intelligence

EPSS Score
2.91%
Probability of exploitation in next 30 days
EPSS Percentile
85.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0291 is in the 74th percentile among its peer group of 51,551 CVEs.

Social Chatter

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

Vendor Patches (1)

junipervendor investigatingvia nvd_reference
View patch

References

kb.juniper.net / JSA10762
Vendor Advisory
securityfocus.com / bid/93532
Third Party AdvisoryVDB Entry
securitytracker.com / id/1037014
Third Party AdvisoryVDB Entry