CVE-2020-1644

mediumpriority · track · 30EPSS 0.013 · 70 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.28% (70th) EPSS

CVSS 5 · medium

Is it mine?

62 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · fstec_bdu

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · ENISA EU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · sirt@juniper.net USexploitability 3.9 · impact 3.6

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-20USprimaryCWE-20USCWE-703USCWE-703US

affected products (62)

Products and version ranges known to be affected.

Juniper Networks Junos OS17.2X75 → 17.2X75-D105.19enisa_euvdEU
Juniper Networks Junos OS17.3 → 17.3R3-S8enisa_euvdEU
Juniper Networks Junos OS17.4 → 17.4R2-S10, 17.4R3-S2enisa_euvdEU
Juniper Networks Junos OS18.1 → 18.1R3-S10enisa_euvdEU
Juniper Networks Junos OS18.2 → 18.2R2-S7, 18.2R3-S4enisa_euvdEU
Juniper Networks Junos OS18.2X75 → 18.2X75-D13, 18.2X75-D411.1, 18.2X75-D420.18, 18.2X75-D52.3, 18.2X75-D60enisa_euvdEU
Juniper Networks Junos OS18.3 → 18.3R2-S4, 18.3R3-S2enisa_euvdEU
Juniper Networks Junos OS18.4 → 18.4R1-S7, 18.4R2-S4, 18.4R3-S2enisa_euvdEU
Juniper Networks Junos OS19.1 → 19.1R1-S5, 19.1R2-S1, 19.1R3enisa_euvdEU
Juniper Networks Junos OS19.2 → 19.2R1-S5, 19.2R2enisa_euvdEU
Juniper Networks Junos OS19.3 → 19.3R2-S2, 19.3R3enisa_euvdEU
Juniper Networks Junos OS19.4 → 19.4R1-S2, 19.4R2enisa_euvdEU
Juniper Networks Junos OS Evolved≤ 19.4-EVOenisa_euvdEU
Juniper Networks Junos OS Evolved≤ 19.3-EVOenisa_euvdEU
Juniper Networks Junos OS Evolved≤ 19.2-EVOenisa_euvdEU
Juniper Networks Junos OS Evolved20.1-EVO → 20.1R2-EVOenisa_euvdEU
Juniper Networks Inc. JunOS≤ 19.1R2-S1fstec_bduRU
Juniper Networks Inc. JunOS≤ 19.3R2-S2fstec_bduRU
Juniper Networks Inc. JunOS≤ 18.4R3-S2fstec_bduRU
Juniper Networks Inc. JunOS≤ 18.4R2-S4fstec_bduRU

showing 20 of 62

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu NVD CVE.org MITRE

published 2020-07-17modified 2026-06-17

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references (7)

External citations — patches, advisories, analysis.

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