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High severity7.5NVD Advisory· Published Oct 16, 2020· Updated Jun 17, 2026

CVE-2020-1662

CVE-2020-1662

Description

On Juniper Networks Junos OS and Junos OS Evolved devices, BGP session flapping can lead to a routing process daemon (RPD) crash and restart, limiting the attack surface to configured BGP peers. This issue only affects devices with BGP damping in combination with accepted-prefix-limit configuration. When the issue occurs the following messages will appear in the /var/log/messages: rpd[6046]: %DAEMON-4-BGP_PREFIX_THRESH_EXCEEDED: XXXX (External AS x): Configured maximum accepted prefix-limit threshold(1800) exceeded for inet6-unicast nlri: 1984 (instance master) rpd[6046]: %DAEMON-3-BGP_CEASE_PREFIX_LIMIT_EXCEEDED: 2001:x:x:x::2 (External AS x): Shutting down peer due to exceeding configured maximum accepted prefix-limit(2000) for inet6-unicast nlri: 2001 (instance master) rpd[6046]: %DAEMON-4: bgp_rt_maxprefixes_check_common:9284: NOTIFICATION sent to 2001:x:x:x::2 (External AS x): code 6 (Cease) subcode 1 (Maximum Number of Prefixes Reached) AFI: 2 SAFI: 1 prefix limit 2000 kernel: %KERN-5: mastership_relinquish_on_process_exit: RPD crashed on master RE. Sending SIGUSR2 to chassisd (5612:chassisd) to trigger RE switchover This issue affects: Juniper Networks Junos OS: 17.2R3-S3; 17.3 version 17.3R3-S3 and later versions, prior to 17.3R3-S8; 17.4 version 17.4R2-S4, 17.4R3 and later versions, prior to 17.4R2-S10, 17.4R3-S2; 18.1 version 18.1R3-S6 and later versions, prior to 18.1R3-S10; 18.2 version 18.2R3 and later versions, prior to 18.2R3-S4; 18.2X75 version 18.2X75-D50, 18.2X75-D60 and later versions, prior to 18.2X75-D53, 18.2X75-D65; 18.3 version 18.3R2 and later versions, prior to 18.3R2-S4, 18.3R3-S2; 18.4 version 18.4R2 and later versions, prior to 18.4R2-S5, 18.4R3-S2; 19.1 version 19.1R1 and later versions, prior to 19.1R2-S2, 19.1R3-S1; 19.2 version 19.2R1 and later versions, prior to 19.2R1-S5, 19.2R2; 19.3 versions prior to 19.3R2-S3, 19.3R3; 19.4 versions prior to 19.4R1-S3, 19.4R2; 20.1 versions prior to 20.1R1-S2, 20.1R2. Juniper Networks Junos OS Evolved prior to 20.1R2-EVO. This issue does not affect Juniper Networks Junos OS versions prior to 17.2R3-S3.

Affected products

62
  • Juniper Networks/Junos60 versions
    cpe:2.3:o:juniper:junos:17.2:r3-s3:*:*:*:*:*:*+ 59 more
    • cpe:2.3:o:juniper:junos:17.2:r3-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.3:r3-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.3:r3-s4:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.3:r3-s7:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r2-s4:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r2-s5:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r2-s6:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r2-s7:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r2-s8:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r2-s9:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r3-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.1:r3-s6:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.1:r3-s7:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.1:r3-s8:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.1:r3-s9:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.2:r3-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.2:r3-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.2:r3-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.2:r3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.2x75:d50:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.2x75:d51:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.2x75:d60:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.3:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.3:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.3:r2-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.3:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.3:r3-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.3:r3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.4:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.4:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.4:r2-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.4:r2-s4:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.4:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.4:r3-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.4:r3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.1:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.1:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.1:r1-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.1:r1-s4:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.1:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.1:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.1:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.1:r3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.2:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.2:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.2:r1-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.2:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.3:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.3:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.3:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.3:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.3:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.3:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.4:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.4:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.4:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.1:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.1:r1:*:*:*:*:*:*
    • (no CPE)range: 17.2R3-S3; 17.3 version 17.3R3-S3 and later versions, prior to 17.3R3-S8; 17.4 version 17.4R2-S4, 17.4R3 and later versions, prior to 17.4R2-S10, 17.4R3-S2; 18.1 version 18.1R3-S6 and later versions, prior to 18.1R3-S10; 18.2 version 18.2R3 and later versions, prior to 18.2R3-S4; 18.2X75 version 18.2X75-D50, 18.2X75-D60 and later versions, prior to 18.2X75-D53, 18.2X75-D65; 18.3 version 18.3R2 and later versions, prior to 18.3R2-S4, 18.3R3-S2; 18.4 version 18.4R2 and later versions, prior to 18.4R2-S5, 18.4R3-S2; 19.1 version 19.1R1 and later versions, prior to 19.1R2-S2, 19.1R3-S1; 19.2 version 19.2R1 and later versions, prior to 19.2R1-S5, 19.2R2; 19.3 versions prior to 19.3R2-S3, 19.3R3; 19.4 versions prior to 19.4R1-S3, 19.4R2; 20.1 versions prior to 20.1R1-S2, 20.1R2
  • Juniper Networks/OS Evolvedllm-fuzzy2 versions
    <20.1R2-EVO+ 1 more
    • (no CPE)range: <20.1R2-EVO
    • (no CPE)range: 19.4-EVO

Patches

Vulnerability mechanics

References

1

News mentions

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