CVE-2020-1634Network attack vector

Chassis-wide service interruption via multicast-triggered SPC core

Published Apr 8, 2020 · Updated Sep 16, 2024

Denial of service in Juniper Networks Junos OS 12.3X48-D80 through 12.3X48-D94 allows remote attackers to reset all chassis FPCs. On affected High-End SRX devices, genuine IPv4 or IPv6 multicast traffic causes a Services Processing Card to core, after which every Flexible PIC Concentrator in the chassis resets. Reachability requires a specific device configuration plus particular network events or operator actions, and Branch SRX devices are not affected.

CVSS severity7.5
High
EPSS probability1.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Juniper Networks Junos OS 12.3X48-D80 through 12.3X48-D94 allows remote attackers to reset all chassis FPCs. On affected High-End SRX devices, genuine IPv4 or IPv6 multicast traffic causes a Services Processing Card to core, after which every Flexible PIC Concentrator in the chassis resets. Reachability requires a specific device configuration plus particular network events or operator actions, and Branch SRX devices are not affected.

The record

CVE
CVE-2020-1634
Published
Apr 8, 2020
Updated
Sep 16, 2024
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-190, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 8, 2020CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=12.3X48-D80 <12.3X48* changes=[{"at":"12.3X48-D95","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OSversion=12.3X48-D80 <12.3X48* changes=[{"at":"12.3X48-D95","status":"unaffected"}]

Published CVSS scores

7.5Juniper Networks, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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