Is CVE-2020-1646 actively exploited?

No active exploitation of CVE-2020-1646 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2020-1646 be exploited remotely?

Yes. CVE-2020-1646 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2020-1646?

CVE-2020-1646 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2020-1646

CWE-159Published: July 17, 2020· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2020-1646 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.