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CVE-2020-1646

Junos OS and Junos OS Evolved: RPD crash while processing a specific BGP update information.

HIGH
7.5
CVSS Score
Published: July 17, 2020 at 06:40 PM UTC
Updated: June 17, 2026 at 03:02 AM UTC
3 products affected across 2 vendorsJunosJunos OS EvolvedJunos OS Evolved

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Severity
HIGH7.5
Exploit prediction
EPSS 1%

Description

On Juniper Networks Junos OS and Junos OS Evolved devices, processing a specific UPDATE for an EBGP peer can lead to a routing process daemon (RPD) crash and restart. This issue occurs only when the device is receiving and processing the BGP UPDATE for an EBGP peer. This issue does not occur when the device is receiving and processing the BGP UPDATE for an IBGP peer. However, the offending BGP UPDATE can originally come from an EBGP peer, propagates through the network via IBGP peers without causing crash, then it causes RPD crash when it is processed for a BGP UPDATE towards an EBGP peer. Repeated receipt and processing of the same specific BGP UPDATE can result in an extended Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS: 17.3R3-S6, 17.4R2-S7, and 18.1R3-S7. Juniper Networks Junos OS Evolved 19.2R2-EVO and later versions, prior to 19.3R1-EVO. Other Junos OS releases are not affected.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Junos OS Evolved· Juniper
95%
19.2 r2
Junos· Juniper Networks
95%
17.3 r3-s617.3R3-S617.4 r2-s717.4R2-S718.1 r3-s718.1R3-S7
Junos OS Evolved· Juniper Networks
60%
v < 19.3R1-EVO19.2R2-EVO ≤ v < 19.2-EVO*19.2R2-EVO
Affected range stops below 19.2-EVO*, so it looks safe — our inference, not a vendor statement
Affected range stops below 19.3R1-EVO, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://kb.juniper.net/JSA11033

CVSS

7.5HIGHjuniper
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-159NVD-CWE-noinfo

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