{ "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-2020-1656", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2020-1656", "idYear": 2020, "status": "PUBLISHED", "publishedAt": "2020-10-16T20:31:25.004Z", "updatedAt": "2024-09-17T04:14:33.289Z", "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: When a DHCPv6 Relay-Agent is configured upon receipt of a specific DHCPv6 client message, Remote Code Execution may occur.", "summary": "The DHCPv6 Relay-Agent service, part of the Juniper Enhanced jdhcpd daemon shipped with Juniper Networks Junos OS has an Improper Input Validation vulnerability which will result in a Denial of Service (DoS) condition when a DHCPv6 client sends a specific DHPCv6 message allowing an attacker to potentially perform a Remote Code Execution (RCE) attack on the target device. Continuous receipt of the specific DHCPv6 client message will result in an extended Denial of Service (DoS) condition. If adjacent devices are also configured to relay DHCP packets, and are not affected by this issue and simply transparently forward unprocessed client DHCPv6 messages, then the attack vector can be a Network-based attack, instead of an Adjacent-device attack. No other DHCP services are affected. Receipt of the packet without configuration of the DHCPv6 Relay-Agent service, will not result in exploitability of this issue. This issue affects Juniper Networks Junos OS: 12.3 versions prior to 12.3R12-S15; 12.3X48 versions prior to 12.3X48-D95; 14.1X53 versions prior to 14.1X53-D53; 15.1 versions prior to 15.1R7-S6; 15.1X49 versions prior to 15.1X49-D200; 15.1X53 versions prior to 15.1X53-D593; 16.1 versions prior to 16.1R7-S7; 16.2 versions prior to 16.2R2-S11; 17.1 versions prior to 17.1R2-S11, 17.1R3-S2; 17.2 versions prior to 17.2R3-S3; 17.2X75 versions prior to 17.2X75-D44; 17.3 versions prior to 17.3R3-S7; 17.4 versions prior to 17.4R2-S9, 17.4R3; 18.1 versions prior to 18.1R3-S9; 18.2 versions prior to 18.2R2-S6, 18.2R3-S2; 18.2X75 versions prior to 18.2X75-D12, 18.2X75-D33, 18.2X75-D435, 18.2X75-D60; 18.3 versions prior to 18.3R1-S7, 18.3R2-S3, 18.3R3-S1; 18.4 versions prior to 18.4R1-S5, 18.4R2-S3, 18.4R3; 19.1 versions prior to 19.1R1-S4, 19.1R2; 19.2 versions prior to 19.2R1-S3, 19.2R2; 19.3 versions prior to 19.3R2.", "affected": [ { "vendor": "Juniper Networks", "product": "Junos OS", "versions": [ { "version": "12.3", "status": "affected", "versionType": "custom", "lessThan": "12.3R12-S15" }, { "version": "12.3X48", "status": "affected", "versionType": "custom", "lessThan": "12.3X48-D95" }, { "version": "14.1X53", "status": "affected", "versionType": "custom", "lessThan": "14.1X53-D53" }, { "version": "15.1", "status": "affected", "versionType": "custom", "lessThan": "15.1R7-S6" }, { "version": "15.1X49", "status": "affected", "versionType": "custom", "lessThan": "15.1X49-D200" }, { "version": "15.1X53", "status": "affected", "versionType": "custom", "lessThan": "15.1X53-D593" }, { "version": "16.1", "status": "affected", "versionType": "custom", "lessThan": "16.1R7-S7" }, { "version": "16.2", "status": "affected", "versionType": "custom", "lessThan": "16.2R2-S11" }, { "version": "17.1", "status": "affected", "versionType": "custom", "lessThan": "17.1R2-S11, 17.1R3-S2" }, { "version": "17.2", "status": "affected", "versionType": "custom", "lessThan": "17.2R3-S3" }, { "version": "17.2X75", "status": "affected", "versionType": "custom", "lessThan": "17.2X75-D44" }, { "version": "17.3", "status": "affected", "versionType": "custom", "lessThan": "17.3R3-S7" }, { "version": "17.4", "status": "affected", "versionType": "custom", "lessThan": "17.4R2-S9, 17.4R3" }, { "version": "18.1", "status": "affected", "versionType": "custom", "lessThan": "18.1R3-S9" }, { "version": "18.2", "status": "affected", "versionType": "custom", "lessThan": "18.2R2-S6, 18.2R3-S2" }, { "version": "18.2X75", "status": "affected", "versionType": "custom", "lessThan": "18.2X75-D12, 18.2X75-D33, 18.2X75-D435, 18.2X75-D60" }, { "version": "18.3", "status": "affected", "versionType": "custom", "lessThan": "18.3R1-S7, 18.3R2-S3, 18.3R3-S1" }, { "version": "18.4", "status": "affected", "versionType": "custom", "lessThan": "18.4R1-S5, 18.4R2-S3, 18.4R3" }, { "version": "19.1", "status": "affected", "versionType": "custom", "lessThan": "19.1R1-S4, 19.1R2" }, { "version": "19.2", "status": "affected", "versionType": "custom", "lessThan": "19.2R1-S3, 19.2R2" }, { "version": "19.3", "status": "affected", "versionType": "custom", "lessThan": "19.3R2" } ] } ] } } }