{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2020-1662", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2020-1662", "idYear": 2020, "status": "PUBLISHED", "publishedAt": "2020-10-16T20:31:26.882Z", "updatedAt": "2024-09-16T19:04:48.478Z", "importedAt": "2026-10-24T01:56:17.081Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "Junos OS and Junos OS Evolved: RPD crash due to BGP session flapping.", "summary": "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": [ { "vendor": "Juniper Networks", "product": "Junos OS", "versions": [ { "version": "17.2R3-S3", "status": "affected" }, { "version": "unspecified", "status": "unaffected", "versionType": "custom", "lessThan": "17.2R3-S3" }, { "version": "17.3R3-S3", "status": "affected", "versionType": "custom", "lessThan": "17.3*", "changes": [ { "at": "17.3R3-S8", "status": "unaffected" } ] }, { "version": "17.4R2-S4, 17.4R3", "status": "affected", "versionType": "custom", "lessThan": "17.4*", "changes": [ { "at": "17.4R2-S10, 17.4R3-S2", "status": "unaffected" } ] }, { "version": "18.1R3-S6", "status": "affected", "versionType": "custom", "lessThan": "18.1*", "changes": [ { "at": "18.1R3-S10", "status": "unaffected" } ] }, { "version": "18.2R3", "status": "affected", "versionType": "custom", "lessThan": "18.2*", "changes": [ { "at": "18.2R3-S4", "status": "unaffected" } ] }, { "version": "18.2X75-D50, 18.2X75-D60", "status": "affected", "versionType": "custom", "lessThan": "18.2X75*", "changes": [ { "at": "18.2X75-D53, 18.2X75-D65", "status": "unaffected" } ] }, { "version": "18.3R2", "status": "affected", "versionType": "custom", "lessThan": "18.3*", "changes": [ { "at": "18.3R2-S4, 18.3R3-S2", "status": "unaffected" } ] }, { "version": "18.4R2", "status": "affected", "versionType": "custom", "lessThan": "18.4*", "changes": [ { "at": "18.4R2-S5, 18.4R3-S2", "status": "unaffected" } ] }, { "version": "19.1R1", "status": "affected", "versionType": "custom", "lessThan": "19.1*", "changes": [ { "at": "19.1R2-S2, 19.1R3-S1", "status": "unaffected" } ] }, { "version": "19.2R1", "status": "affected", "versionType": "custom", "lessThan": "19.2*", "changes": [ { "at": "19.2R1-S5, 19.2R2", "status": "unaffected" } ] }, { "version": "19.3", "status": "affected", "versionType": "custom", "lessThan": "19.3R2-S3, 19.3R3" }, { "version": "19.4", "status": "affected", "versionType": "custom", "lessThan": "19.4R1-S3, 19.4R2" }, { "version": "20.1", "status": "affected", "versionType": "custom", "lessThan": "20.1R1-S2, 20.1R2" } ] }, { "vendor": "Juniper Networks", "product": "Junos OS Evolved", "versions": [ { "version": "19.4-EVO", "status": "affected" }, { "version": "20.1-EVO", "status": "affected", "versionType": "custom", "lessThan": "20.1R2-EVO" } ] } ] } } }