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CVE-2020-1644

Junos OS and Junos OS Evolved: RPD crash due to specific BGP UPDATE packets

High7.5EPSS 1.3%
Published
Updated
Reserved
Assigned by
juniper

Description

On Juniper Networks Junos OS and Junos OS Evolved devices, the receipt of a specific BGP UPDATE packet causes an internal counter to be incremented incorrectly, which over time can lead to the routing protocols process (RPD) crash and restart. This issue affects both IBGP and EBGP multihop deployment in IPv4 or IPv6 network. This issue affects: Juniper Networks Junos OS: 17.2X75 versions prior to 17.2X75-D105.19; 17.3 versions prior to 17.3R3-S8; 17.4 versions prior to 17.4R2-S10, 17.4R3-S2; 18.1 versions prior to 18.1R3-S10; 18.2 versions prior to 18.2R2-S7, 18.2R3-S4; 18.2X75 versions prior to 18.2X75-D13, 18.2X75-D411.1, 18.2X75-D420.18, 18.2X75-D52.3, 18.2X75-D60; 18.3 versions prior to 18.3R2-S4, 18.3R3-S2; 18.4 versions prior to 18.4R1-S7, 18.4R2-S4, 18.4R3-S2; 19.1 versions prior to 19.1R1-S5, 19.1R2-S1, 19.1R3; 19.2 versions prior to 19.2R1-S5, 19.2R2; 19.3 versions prior to 19.3R2-S2, 19.3R3; 19.4 versions prior to 19.4R1-S2, 19.4R2. Juniper Networks Junos OS Evolved: any releases prior to 20.1R2-EVO. This issue does not affect Juniper Networks Junos OS releases prior to 17.3R1.

Scores

CVSS scores of CVE-2020-1644, by who scored it
Scored byCVSSScoreVector
juniperCNA (assigner)3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVDNVD · Modified3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
1.3% · top 30% of all CVEs (6 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Weakness

Affected products

  • Juniper Networks · Junos OS

    • unaffected unspecified – ≤ 17.3R1
    • affected 17.2X75 – < 17.2X75-D105.19
    • affected 17.3 – < 17.3R3-S8
    • affected 17.4 – < 17.4R2-S10, 17.4R3-S2
    • affected 18.1 – < 18.1R3-S10
    • affected 18.2 – < 18.2R2-S7, 18.2R3-S4
    • affected 18.2X75 – < 18.2X75-D13, 18.2X75-D411.1, 18.2X75-D420.18, 18.2X75-D52.3, 18.2X75-D60
    • affected 18.3 – < 18.3R2-S4, 18.3R3-S2
    • affected 18.4 – < 18.4R1-S7, 18.4R2-S4, 18.4R3-S2
    • affected 19.1 – < 19.1R1-S5, 19.1R2-S1, 19.1R3
    • affected 19.2 – < 19.2R1-S5, 19.2R2
    • affected 19.3 – < 19.3R2-S2, 19.3R3
    • affected 19.4 – < 19.4R1-S2, 19.4R2

  • Juniper Networks · Junos OS Evolved

    • affected 19.2-EVO
    • affected 19.3-EVO
    • affected 19.4-EVO
    • affected 20.1-EVO – < 20.1R2-EVO

What to do

Solution: The following software releases have been updated to resolve this specific issue: Junos OS: 17.2X75-D105.19, 17.3R3-S8, 17.4R2-S10, 17.4R3-S2, 18.1R3-S10, 18.2R2-S7, 18.2R3-S4, 18.2X75-D13, 18.2X75-D411.1, 18.2X75-D420.18, 18.2X75-D52.3, 18.2X75-D60, 18.3R2-S4, 18.3R3-S2, 18.4R1-S7, 18.4R2-S4, 18.4R3-S2, 19.1R1-S5, 19.1R2-S1, 19.1R3, 19.2R1-S5, 19.2R2, 19.3R2-S2, 19.3R3, 19.4R1-S2, 19.4R2, 20.1R1 and all subsequent releases. Junos OS Evolved: 20.1R2-EVO, 20.2R1-EVO and all subsequent releases.

Workaround: There are no available workarounds for this issue.

Exploitation: Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .