{"id":"CVE-2026-20048","aliases":["EUVD-2026-8668","GHSA-c9vx-x9q2-ffx8"],"status":"published","title":"Cisco NX-OS Software SNMP Denial of Service Vulnerability","description":"A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco Nexus 9000 Series Fabric Switches in ACI mode could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability is due to improper processing when parsing SNMP requests. An attacker could exploit this vulnerability by continuously sending SNMP queries\u0026nbsp;to a specific MIB of an affected device. A successful exploit could allow the attacker to cause a kernel panic on the device, resulting in a reload and a\u0026nbsp;DoS condition.\r\nNote: This vulnerability affects SNMP versions 1, 2c, and 3. To exploit\u0026nbsp;this vulnerability through SNMPv1 or\u0026nbsp;SNMPv2c, the attacker must have a valid read-only SNMP community string for the affected system. To exploit this vulnerability through SNMPv3, the attacker must have valid SNMP user credentials for the affected system.","severity":{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00344,"percentile":0.28142,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-789"],"published":"2026-02-25T16:26:28Z","modified":"2026-06-17T10:16:58Z","products":[{"vendor":"cisco","product":"cisco nx-os system software in aci mode"}],"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-dsnmp-cNN39Uh"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20048"},{"url":"https://github.com/advisories/GHSA-c9vx-x9q2-ffx8"}],"sources":{"cve":[{"id":"CVE-2026-20048","title":"Cisco NX-OS Software SNMP Denial of Service Vulnerability","description":"A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco Nexus 9000 Series Fabric Switches in ACI mode could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability is due to improper processing when parsing SNMP requests. An attacker could exploit this vulnerability by continuously sending SNMP queries\u0026nbsp;to a specific MIB of an affected device. A successful exploit could allow the attacker to cause a kernel panic on the device, resulting in a reload and a\u0026nbsp;DoS condition.\r\nNote: This vulnerability affects SNMP versions 1, 2c, and 3. To exploit\u0026nbsp;this vulnerability through SNMPv1 or\u0026nbsp;SNMPv2c, the attacker must have a valid read-only SNMP community string for the affected system. To exploit this vulnerability through SNMPv3, the attacker must have valid SNMP user credentials for the affected system.","status":"published","published":"2026-02-25T16:26:28.329Z","modified":"2026-02-25T19:05:48.366Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-789"],"updated_at":"2026-11-02T13:35:33.380441Z"}],"euvd":[{"id":"EUVD-2026-8668","description":"A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco Nexus 9000 Series Fabric Switches in ACI mode could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability is due to improper processing when parsing SNMP requests. An attacker could exploit this vulnerability by continuously sending SNMP queries\u0026nbsp;to a specific MIB of an affected device. A successful exploit could allow the attacker to cause a kernel panic on the device, resulting in a reload and a\u0026nbsp;DoS condition.\r\nNote: This vulnerability affects SNMP versions 1, 2c, and 3. To exploit\u0026nbsp;this vulnerability through SNMPv1 or\u0026nbsp;SNMPv2c, the attacker must have a valid read-only SNMP community string for the affected system. To exploit this vulnerability through SNMPv3, the attacker must have valid SNMP user credentials for the affected system.","status":"published","published":"2026-02-25T16:26:28Z","modified":"2026-02-25T19:05:48Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T19:48:28.530473Z"}],"ghsa":[{"id":"GHSA-c9vx-x9q2-ffx8","title":"A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco Nexus 9000...","description":"A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco Nexus 9000 Series Fabric Switches in ACI mode could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\n\nThis vulnerability is due to improper processing when parsing SNMP requests. An attacker could exploit this vulnerability by continuously sending SNMP queries\u0026nbsp;to a specific MIB of an affected device. A successful exploit could allow the attacker to cause a kernel panic on the device, resulting in a reload and a\u0026nbsp;DoS condition.\nNote: This vulnerability affects SNMP versions 1, 2c, and 3. To exploit\u0026nbsp;this vulnerability through SNMPv1 or\u0026nbsp;SNMPv2c, the attacker must have a valid read-only SNMP community string for the affected system. To exploit this vulnerability through SNMPv3, the attacker must have valid SNMP user credentials for the affected system.","status":"published","published":"2026-02-25T18:31:38Z","modified":"2026-02-25T18:31:44Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-789"],"updated_at":"2026-11-02T15:06:22.774985Z"}],"nvd":[{"id":"CVE-2026-20048","description":"A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco Nexus 9000 Series Fabric Switches in ACI mode could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability is due to improper processing when parsing SNMP requests. An attacker could exploit this vulnerability by continuously sending SNMP queries\u0026nbsp;to a specific MIB of an affected device. A successful exploit could allow the attacker to cause a kernel panic on the device, resulting in a reload and a\u0026nbsp;DoS condition.\r\nNote: This vulnerability affects SNMP versions 1, 2c, and 3. To exploit\u0026nbsp;this vulnerability through SNMPv1 or\u0026nbsp;SNMPv2c, the attacker must have a valid read-only SNMP community string for the affected system. To exploit this vulnerability through SNMPv3, the attacker must have valid SNMP user credentials for the affected system.","status":"published","published":"2026-02-25T17:25:25.62Z","modified":"2026-06-17T10:16:58.487Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-789"],"updated_at":"2026-11-02T14:12:07.027269Z"}]}}