{ "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-2021-0283", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-0283", "idYear": 2021, "status": "PUBLISHED", "publishedAt": "2021-07-15T20:00:56.945Z", "updatedAt": "2024-09-17T03:33:12.874Z", "importedAt": "2026-10-24T01:56:21.187Z", "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: Upon receipt of specific sequences of genuine packets destined to the device the kernel will crash and restart (vmcore)", "summary": "A buffer overflow vulnerability in the TCP/IP stack of Juniper Networks Junos OS allows an attacker to send specific sequences of packets to the device thereby causing a Denial of Service (DoS). By repeatedly sending these sequences of packets to the device, an attacker can sustain the Denial of Service (DoS) condition. The device will abnormally shut down as a result of these sent packets. A potential indicator of compromise will be the following message in the log files: \"eventd[13955]: SYSTEM_ABNORMAL_SHUTDOWN: System abnormally shut down\" These issue are only triggered by traffic destined to the device. Transit traffic will not trigger these issues. This issue affects: Juniper Networks Junos OS 12.3 versions prior to 12.3R12-S19; 15.1 versions prior to 15.1R7-S10; 16.1 version 16.1R1 and later versions; 16.2 version 16.2R1 and later versions; 17.1 version 17.1R1 and later versions; 17.2 version 17.2R1 and later versions; 17.3 versions prior to 17.3R3-S12; 17.4 version 17.4R1 and later versions; 18.1 versions prior to 18.1R3-S13; 18.2 version 18.2R1 and later versions; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R2-S9, 18.4R3-S9; 19.1 versions prior to 19.1R3-S6; 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R2-S7, 19.3R3-S3; 19.4 versions prior to 19.4R3-S5; 20.1 versions prior to 20.1R2-S2, 20.1R3-S1; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3; 20.4 versions prior to 20.4R2-S1, 20.4R3; 21.1 versions prior to 21.1R1-S1, 21.1R2; 21.2 versions prior to 21.2R1-S1, 21.2R2.", "affected": [ { "vendor": "Juniper Networks", "product": "Junos OS", "versions": [ { "version": "12.3", "status": "affected", "versionType": "custom", "lessThan": "12.3R12-S19" }, { "version": "15.1", "status": "affected", "versionType": "custom", "lessThan": "15.1R7-S10" }, { "version": "16.1R1", "status": "affected", "versionType": "custom", "lessThan": "16.1*" }, { "version": "16.2R1", "status": "affected", "versionType": "custom", "lessThan": "16.2*" }, { "version": "17.1R1", "status": "affected", "versionType": "custom", "lessThan": "17.1*" }, { "version": "17.2R1", "status": "affected", "versionType": "custom", "lessThan": "17.2*" }, { "version": "17.3", "status": "affected", "versionType": "custom", "lessThan": "17.3R3-S12" }, { "version": "17.4R1", "status": "affected", "versionType": "custom", "lessThan": "17.4*" }, { "version": "18.1", "status": "affected", "versionType": "custom", "lessThan": "18.1R3-S13" }, { "version": "18.2R1", "status": "affected", "versionType": "custom", "lessThan": "18.2*" }, { "version": "18.3", "status": "affected", "versionType": "custom", "lessThan": "18.3R3-S5" }, { "version": "18.4", "status": "affected", "versionType": "custom", "lessThan": "18.4R2-S9, 18.4R3-S9" }, { "version": "19.1", "status": "affected", "versionType": "custom", "lessThan": "19.1R3-S6" }, { "version": "19.2", "status": "affected", "versionType": "custom", "lessThan": "19.2R1-S7, 19.2R3-S3" }, { "version": "19.3", "status": "affected", "versionType": "custom", "lessThan": "19.3R2-S7, 19.3R3-S3" }, { "version": "19.4", "status": "affected", "versionType": "custom", "lessThan": "19.4R3-S5" }, { "version": "20.1", "status": "affected", "versionType": "custom", "lessThan": "20.1R2-S2, 20.1R3-S1" }, { "version": "20.2", "status": "affected", "versionType": "custom", "lessThan": "20.2R3-S2" }, { "version": "20.3", "status": "affected", "versionType": "custom", "lessThan": "20.3R3" }, { "version": "20.4", "status": "affected", "versionType": "custom", "lessThan": "20.4R2-S1, 20.4R3" }, { "version": "21.1", "status": "affected", "versionType": "custom", "lessThan": "21.1R1-S1, 21.1R2" }, { "version": "21.2", "status": "affected", "versionType": "custom", "lessThan": "21.2R1-S1, 21.2R2" } ] } ] } } }