CVE-2020-1657

mediumpriority · track · 20EPSS 0.013 · 70 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.29% (70th) EPSS

CVSS 5 · medium

Is it mine?

30 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · fstec_bdu

EPSS · scored 2026-10-27

On SRX Series devices, a vulnerability in the key-management-daemon (kmd) daemon of Juniper Networks Junos OS allows an attacker to spoof packets targeted to IPSec peers before a security association (SA) is established thereby causing a failure to set up the IPSec channel. Sustained receipt of these spoofed packets can cause a sustained Denial of Service (DoS) condition. This issue affects IPv4 and IPv6 implementations. This issue affects Juniper Networks Junos OS on SRX Series: 12.3X48 versions prior to 12.3X48-D90; 15.1X49 versions prior to 15.1X49-D190; 17.4 versions prior to 17.4R2-S9, 17.4R3; 18.1 versions prior to 18.1R3-S9; 18.2 versions prior to 18.2R3; 18.3 versions prior to 18.3R1-S7, 18.3R2-S3, 18.3R3; 18.4 versions prior to 18.4R1-S6, 18.4R2-S3, 18.4R3; 19.1 versions prior to 19.1R1-S4, 19.1R2. This issue does not affect 12.3 or 15.1 releases which are non-SRX Series releases.

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

v3.17.5highAV: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-408USCWE-408US

affected products (30)

Products and version ranges known to be affected.

Juniper Networks Junos OS12.3X48 → 12.3X48-D90enisa_euvdEU
Juniper Networks Junos OS15.1X49 → 15.1X49-D190enisa_euvdEU
Juniper Networks Junos OS17.4 → 17.4R2-S9, 17.4R3enisa_euvdEU
Juniper Networks Junos OS18.1 → 18.1R3-S9enisa_euvdEU
Juniper Networks Junos OS18.2 → 18.2R3enisa_euvdEU
Juniper Networks Junos OS18.3 → 18.3R1-S7, 18.3R2-S3, 18.3R3enisa_euvdEU
Juniper Networks Junos OS18.4 → 18.4R1-S6, 18.4R2-S3, 18.4R3enisa_euvdEU
Juniper Networks Junos OS19.1 → 19.1R1-S4, 19.1R2enisa_euvdEU
Juniper Networks Inc. JunOS≤ 18.3R1-S7fstec_bduRU
Juniper Networks Inc. JunOS≤ 18.2R3fstec_bduRU
Juniper Networks Inc. JunOS≤ 18.1R3-S9fstec_bduRU
Juniper Networks Inc. JunOS≤ 17.4R3fstec_bduRU
Juniper Networks Inc. JunOS≤ 17.4R2-S9fstec_bduRU
Juniper Networks Inc. JunOS≤ 15.1X49-D190fstec_bduRU
Juniper Networks Inc. JunOS≤ 12.3X48-D90fstec_bduRU
Juniper Networks Inc. JunOS≤ 19.1R2fstec_bduRU
Juniper Networks Inc. JunOS≤ 19.1R1-S4fstec_bduRU
Juniper Networks Inc. JunOS≤ 18.4R3fstec_bduRU
Juniper Networks Inc. JunOS≤ 18.4R2-S3fstec_bduRU
Juniper Networks Inc. JunOS≤ 18.4R1-S6fstec_bduRU

showing 20 of 30

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 2020-10-16modified 2026-06-17

references (7)

External citations — patches, advisories, analysis.

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