# CVE-2020-1657

## Summary

- **CVE ID:** CVE-2020-1657
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-408
- **Published:** Oct 16, 2020
- **Last Modified:** Mar 14, 2026

## Description

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.

## Affected Products

- Juniper Networks — Junos OS (12.3X48)
- Juniper Networks — Junos OS (15.1X49)
- Juniper Networks — Junos OS (17.4)
- Juniper Networks — Junos OS (18.1)
- Juniper Networks — Junos OS (18.2)
- Juniper Networks — Junos OS (18.3)
- Juniper Networks — Junos OS (18.4)
- Juniper Networks — Junos OS (19.1)

## References

- [CNA](https://kb.juniper.net/JSA11050)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.39%
- **EPSS Percentile:** 59.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._