CVE detail

CVE-2020-1628 — CVE-2020-1628

Published 2020-04-08 · Modified 2026-06-17 · Vendor juniper · Product junos · Source nvd
MEDIUM
severity
CVSS-derived band
5.3
CVSS v3
0–10 scale
0.0126
EPSS probability
exploitation probability, 30d
67.0%
EPSS percentile
percentile vs all CVEs
NOT LISTED
CISA KEV
known exploited catalog

Description

Juniper Networks Junos OS uses the 128.0.0.0/2 subnet for internal communications between the RE and PFEs. It was discovered that packets utilizing these IP addresses may egress an EX4300 switch, leaking configuration information such as heartbeats, kernel versions, etc. out to the Internet, leading to an information exposure vulnerability. This issue affects Juniper Networks Junos OS: 14.1X53 versions prior to 14.1X53-D53 on EX4300; 15.1 versions prior to 15.1R7-S6 on EX4300; 15.1X49 versions prior to 15.1X49-D200, 15.1X49-D210 on EX4300; 16.1 versions prior to 16.1R7-S7 on EX4300; 17.1 versions prior to 17.1R2-S11, 17.1R3-S2 on EX4300; 17.2 versions prior to 17.2R3-S3 on EX4300; 17.3 versions prior to 17.3R2-S5, 17.3R3-S7 on EX4300; 17.4 versions prior to 17.4R2-S9, 17.4R3 on EX4300; 18.

Remediation

vendor remediation guidance

The following software releases have been updated to resolve this specific issue: 14.1X53-D53, 15.1R7-S6, 15.1X49-D200, 15.1X49-D210, 16.1R7-S7, 17.1R2-S11, 17.1R3-S2, 17.2R3-S3, 17.3R2-S5, 17.3R3-S7, 17.4R2-S9, 17.4R3, 18.1R3-S8, 18.2R3-S2, 18.3R2-S3, 18.3R3, 18.3R3-S1, 18.4R1-S5, 18.4R2-S3, 18.4R3, 19.1R1-S4, 19.1R2, 19.2R1-S4, 19.2R2, 19.3R1-S1, 19.3R2, 19.4R1, and all subsequent releases.

workarounds

Configure a firewall filter to discard packets sourced from the internal network. Disabling the net.transit_re sysctl flag will also cause management traffic forwarded to the PFE ports to be dropped: % sysctl -w net.transit_re=0 Note that sysctl flags do not survive a reboot.

ProductVulnerable rangeFixed versionAdvisory
Juniper Networks Junos OS>=14.1X53<14.1X53-D5314.1X53-D53advisory ↗
Juniper Networks Junos OS>=15.1<15.1R7-S615.1R7-S6advisory ↗
Juniper Networks Junos OS>=15.1X49<15.1X49-D200, 15.1X49-D21015.1X49-D200, 15.1X49-D210advisory ↗
Juniper Networks Junos OS>=16.1<16.1R7-S716.1R7-S7advisory ↗
Juniper Networks Junos OS>=17.1<17.1R2-S11, 17.1R3-S217.1R2-S11, 17.1R3-S2advisory ↗
Juniper Networks Junos OS>=17.2<17.2R3-S317.2R3-S3advisory ↗
Juniper Networks Junos OS>=17.3<17.3R2-S5, 17.3R3-S717.3R2-S5, 17.3R3-S7advisory ↗
Juniper Networks Junos OS>=17.4<17.4R2-S9, 17.4R317.4R2-S9, 17.4R3advisory ↗
Juniper Networks Junos OS>=18.1<18.1R3-S818.1R3-S8advisory ↗
Juniper Networks Junos OS>=18.2<18.2R3-S218.2R3-S2advisory ↗
Juniper Networks Junos OS>=18.3<18.3R2-S3, 18.3R3, 18.3R3-S118.3R2-S3, 18.3R3, 18.3R3-S1advisory ↗
Juniper Networks Junos OS>=18.4<18.4R1-S5, 18.4R2-S3, 18.4R318.4R1-S5, 18.4R2-S3, 18.4R3advisory ↗
Juniper Networks Junos OS>=19.1<19.1R1-S4, 19.1R219.1R1-S4, 19.1R2advisory ↗
Juniper Networks Junos OS>=19.2<19.2R1-S4, 19.2R219.2R1-S4, 19.2R2advisory ↗
Juniper Networks Junos OS>=19.3<19.3R1-S1, 19.3R219.3R1-S1, 19.3R2advisory ↗

References

cvedb.io · NVD · CISA KEV · FIRST EPSS · vendor advisories (CVE Program List v5). Informational only, no warranty — verify every remediation against the vendor advisory before acting on it. This product uses data from the NVD API but is not endorsed or certified by the NVD, CISA, FIRST.org or any vendor named. CVE® is a registered trademark of The MITRE Corporation.