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CVE-2020-1664

Junos OS: Buffer overflow vulnerability in device control daemon

High7.8EPSS 0.43%
Published
Updated
Reserved
Assigned by
juniper

Description

A stack buffer overflow vulnerability in the device control daemon (DCD) on Juniper Networks Junos OS allows a low privilege local user to create a Denial of Service (DoS) against the daemon or execute arbitrary code in the system with root privilege. This issue affects Juniper Networks Junos OS: 17.3 versions prior to 17.3R3-S9; 17.4 versions prior to 17.4R2-S12, 17.4R3-S3; 18.1 versions prior to 18.1R3-S11; 18.2 versions prior to 18.2R3-S6; 18.2X75 versions prior to 18.2X75-D53, 18.2X75-D65; 18.3 versions prior to 18.3R2-S4, 18.3R3-S4; 18.4 versions prior to 18.4R2-S5, 18.4R3-S5; 19.1 versions prior to 19.1R3-S3; 19.2 versions prior to 19.2R1-S5, 19.2R3; 19.3 versions prior to 19.3R2-S4, 19.3R3; 19.4 versions prior to 19.4R1-S3, 19.4R2-S2, 19.4R3; 20.1 versions prior to 20.1R1-S4, 20.1R2; 20.2 versions prior to 20.2R1-S1, 20.2R2. Versions of Junos OS prior to 17.3 are unaffected by this vulnerability.

Scores

CVSS scores of CVE-2020-1664, by who scored it
Scored byCVSSScoreVector
juniperCNA (assigner)3.1High7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Modified3.1High7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.43% · top 63% 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 7.8.

Weakness

Affected products

  • Juniper Networks · Junos OS

    • affected 17.3 – < 17.3R3-S9
    • affected 17.4 – < 17.4R2-S12, 17.4R3-S3
    • affected 18.1 – < 18.1R3-S11
    • affected 18.2 – < 18.2R3-S6
    • affected 18.2X75 – < 18.2X75-D53, 18.2X75-D65
    • affected 18.3 – < 18.3R2-S4, 18.3R3-S4
    • affected 18.4 – < 18.4R2-S5, 18.4R3-S5
    • affected 19.1 – < 19.1R3-S3
    • affected 19.2 – < 19.2R1-S5, 19.2R3
    • affected 19.3 – < 19.3R2-S4, 19.3R3
    • affected 19.4 – < 19.4R1-S3, 19.4R2-S2, 19.4R3
    • affected 20.1 – < 20.1R1-S4, 20.1R2
    • affected 20.2 – < 20.2R1-S1, 20.2R2

What to do

Solution: The following software releases have been updated to resolve this specific issue: Junos OS 17.3R3-S9, 17.4R2-S12, 17.4R3-S3, 18.1R3-S11, 18.2R3-S6, 18.2X75-D53, 18.2X75-D65, 18.3R2-S4, 18.3R3-S4, 18.4R2-S5, 18.4R3-S5, 19.1R3-S3, 19.2R1-S5, 19.2R3, 19.3R2-S4, 19.3R3, 19.4R1-S3, 19.4R2-S2, 19.4R3, 20.1R1-S4, 20.1R2, 20.2R1-S1, 20.2R2, 20.3R1, and all subsequent releases.

Workaround: Use access lists or firewall filters to limit CLI access to the device only from trusted, administrative networks or hosts.

Workaround: Limit access to the Junos OS CLI to only trusted system administrators.

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 .