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CVE-2020-1665

17
FAUCET Score

CVE-2020-1665 impacts Juniper Networks MX Series and EX9200 Series devices with Trio-based Packet Forwarding Engines, where IPv6 Distributed Denial of Service (DDoS) protection may fail to activate under certain threshold conditions. This failure can lead to the Routing Engine or Flexible PIC Concentrator becoming overwhelmed, disrupting network operations. The vulnerability has a CVSSv3.1 score of 5.3 (Medium), indicating a low-complexity attack that can be launched remotely without authentication, resulting in a low impact on availability. It does not affect IPv4 DDoS protection. Currently, there is no evidence of active exploitation, and no public exploit code (Metasploit, Nuclei, ExploitDB) is available. The vulnerability has received minimal community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
17.2CPE matchmatch criteria
cpe:2.3:o:juniper:junos:17.2:-:*:*:*:*:*:*
17.2CPE matchmatch criteria
cpe:2.3:o:juniper:junos:17.2:r1:*:*:*:*:*:*
17.2CPE matchmatch criteria
cpe:2.3:o:juniper:junos:17.2:r1-s1:*:*:*:*:*:*
17.2CPE matchmatch criteria
cpe:2.3:o:juniper:junos:17.2:r1-s2:*:*:*:*:*:*
17.2CPE matchmatch criteria
cpe:2.3:o:juniper:junos:17.2:r1-s3:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.28%
Probability of exploitation in next 30 days
EPSS Percentile
67.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0128 is in the 46th percentile among its peer group of 23,690 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 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 / JSA11062
Vendor Advisory
kb.juniper.net / KB25385
Vendor Advisory