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CVE-2020-1600

Junos OS: A specific SNMP command can trigger a high CPU usage Denial of Service in the RPD daemon.

Medium6.5EPSS 1.2%
Published
Updated
Reserved
Assigned by
juniper

Description

In a Point-to-Multipoint (P2MP) Label Switched Path (LSP) scenario, an uncontrolled resource consumption vulnerability in the Routing Protocol Daemon (RPD) in Juniper Networks Junos OS allows a specific SNMP request to trigger an infinite loop causing a high CPU usage Denial of Service (DoS) condition. This issue affects both SNMP over IPv4 and IPv6. This issue affects: Juniper Networks Junos OS: 12.3X48 versions prior to 12.3X48-D90; 15.1 versions prior to 15.1R7-S6; 15.1X49 versions prior to 15.1X49-D200; 15.1X53 versions prior to 15.1X53-D238, 15.1X53-D592; 16.1 versions prior to 16.1R7-S5; 16.2 versions prior to 16.2R2-S11; 17.1 versions prior to 17.1R3-S1; 17.2 versions prior to 17.2R3-S2; 17.3 versions prior to 17.3R3-S7; 17.4 versions prior to 17.4R2-S4, 17.4R3; 18.1 versions prior to 18.1R3-S5; 18.2 versions prior to 18.2R3; 18.2X75 versions prior to 18.2X75-D50; 18.3 versions prior to 18.3R2; 18.4 versions prior to 18.4R2; 19.1 versions prior to 19.1R2.

Scores

CVSS scores of CVE-2020-1600, by who scored it
Scored byCVSSScoreVector
juniperCNA (assigner)3.1Medium6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVDNVD · Modified3.1Medium6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
1.2% · top 32% 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: Medium 6.5.

Weakness

Affected products

  • Juniper Networks · Junos OS

    • affected 12.3X48 – < 12.3X48-D90
    • affected 15.1X53 – < 15.1X53-D238, 15.1X53-D592
    • affected 16.1 – < 16.1R7-S5
    • affected 16.2 – < 16.2R2-S11
    • affected 17.1 – < 17.1R2-S11, 17.1R3-S1
    • affected 17.2 – < 17.2R3-S2
    • affected 17.3 – < 17.3R3-S7
    • affected 17.4 – < 17.4R2-S4, 17.4R3
    • affected 18.1 – < 18.1R3-S5
    • affected 18.2 – < 18.2R3
    • affected 18.2X75 – < 18.2X75-D50
    • affected 18.3 – < 18.3R2
    • affected 18.4 – < 18.4R2
    • affected 19.1 – < 19.1R2
    • affected 19.2 – < 19.2R1
    • affected 15.1X49 – < 15.1X49-D200
    • affected 15.1 – < 15.1R7-S6

What to do

Solution: The following software releases have been updated to resolve this specific issue: 12.3X48-D90, 15.1X49-D200, 15.1R7-S6, 15.1X53-D238, 15.1X53-D592, 16.1R7-S5, 16.2R2-S11, 17.1R3-S1, 17.2R3-S2, 17.3R3-S7, 17.4R2-S4, 17.4R3, 18.1R3-S5, 18.2R3, 18.2X75-D50, 18.3R2, 18.4R2, 19.1R2, 19.2R1, and all subsequent releases.

Workaround: If SNMP is not needed, remove SNMP from the system, otherwise, there are no available workarounds for this issue. SNMP is disabled by default. Additional steps which may reduce the risk of exploitation include: Utilizing edge filtering with source-address validation (uRPF, etc.), access control lists (ACLs), and/or SNMPv3 authentication to limit access to the device only from trusted hosts.

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

References (2)

Sources

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

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Record last updated .