{"id":"CVE-2026-20048","state":"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 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 DoS condition.\r\nNote: This vulnerability affects SNMP versions 1, 2c, and 3. To exploit this vulnerability through SNMPv1 or 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.","publishedAt":"2026-02-25T16:26:28.329Z","updatedAt":"2026-02-25T19:05:48.366Z","severity":{"score":7.7,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","source":"cisco"},"assigner":"cisco","products":["Cisco Cisco NX-OS System Software in ACI Mode"],"affected":[{"vendor":"Cisco","product":"Cisco NX-OS System Software in ACI Mode","defaultStatus":"unknown","versions":[{"version":"15.2(1g)","status":"affected"},{"version":"15.2(2e)","status":"affected"},{"version":"15.2(2f)","status":"affected"},{"version":"15.2(2g)","status":"affected"},{"version":"15.2(2h)","status":"affected"},{"version":"15.2(3f)","status":"affected"},{"version":"15.2(3e)","status":"affected"},{"version":"15.2(3g)","status":"affected"},{"version":"15.2(4d)","status":"affected"},{"version":"15.2(4e)","status":"affected"},{"version":"15.2(5c)","status":"affected"},{"version":"15.2(5d)","status":"affected"},{"version":"16.0(1g)","status":"affected"},{"version":"15.2(5e)","status":"affected"},{"version":"15.2(4f)","status":"affected"},{"version":"15.2(6e)","status":"affected"},{"version":"15.2(6h)","status":"affected"},{"version":"16.0(1j)","status":"affected"},{"version":"15.2(6g)","status":"affected"},{"version":"15.2(7f)","status":"affected"},{"version":"15.2(7g)","status":"affected"},{"version":"16.0(2h)","status":"affected"},{"version":"15.2(8d)","status":"affected"},{"version":"16.0(2j)","status":"affected"},{"version":"15.2(8e)","status":"affected"},{"version":"16.0(3d)","status":"affected"},{"version":"16.0(3e)","status":"affected"},{"version":"15.2(8f)","status":"affected"},{"version":"15.2(8g)","status":"affected"},{"version":"15.3(1d)","status":"affected"},{"version":"15.2(8h)","status":"affected"},{"version":"16.0(4c)","status":"affected"},{"version":"15.3(2a)","status":"affected"},{"version":"15.2(8i)","status":"affected"},{"version":"16.0(5h)","status":"affected"},{"version":"15.3(2b)","status":"affected"},{"version":"16.0(3g)","status":"affected"},{"version":"16.0(5j)","status":"affected"},{"version":"15.3(2c)","status":"affected"},{"version":"16.0(6c)","status":"affected"},{"version":"15.3(2d)","status":"affected"},{"version":"16.1(1f)","status":"affected"},{"version":"16.0(7e)","status":"affected"},{"version":"16.0(8e)","status":"affected"},{"version":"15.3(2e)","status":"affected"},{"version":"16.0(8f)","status":"affected"},{"version":"16.1(2f)","status":"affected"},{"version":"16.1(2g)","status":"affected"},{"version":"15.3(2f)","status":"affected"},{"version":"16.0(9c)","status":"affected"},{"version":"16.1(3f)","status":"affected"},{"version":"16.0(9d)","status":"affected"},{"version":"16.0(6h)","status":"affected"},{"version":"16.0(8h)","status":"affected"},{"version":"16.1(3g)","status":"affected"},{"version":"16.0(9e)","status":"affected"},{"version":"16.1(4h)","status":"affected"}]}],"references":["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-dsnmp-cNN39Uh"],"weaknesses":["CWE-789"],"ingestedAt":"2026-10-29T20:11:10.572Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/20xxx/CVE-2026-20048.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-20048","state":"PUBLISHED","datePublished":"2026-02-25T16:26:28.329Z","dateUpdated":"2026-02-25T19:05:48.366Z","assignerShortName":"cisco","assignerOrgId":"d1c1063e-7a18-46af-9102-31f8928bc633","dateReserved":"2025-10-08T11:59:15.355Z"},"containers":{"cna":{"title":"Cisco NX-OS Software SNMP Denial of Service Vulnerability","descriptions":[{"lang":"en","value":"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 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 DoS condition.\r\nNote: This vulnerability affects SNMP versions 1, 2c, and 3. To exploit this vulnerability through SNMPv1 or 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."}],"affected":[{"vendor":"Cisco","product":"Cisco NX-OS System Software in ACI Mode","defaultStatus":"unknown","versions":[{"version":"15.2(1g)","status":"affected"},{"version":"15.2(2e)","status":"affected"},{"version":"15.2(2f)","status":"affected"},{"version":"15.2(2g)","status":"affected"},{"version":"15.2(2h)","status":"affected"},{"version":"15.2(3f)","status":"affected"},{"version":"15.2(3e)","status":"affected"},{"version":"15.2(3g)","status":"affected"},{"version":"15.2(4d)","status":"affected"},{"version":"15.2(4e)","status":"affected"},{"version":"15.2(5c)","status":"affected"},{"version":"15.2(5d)","status":"affected"},{"version":"16.0(1g)","status":"affected"},{"version":"15.2(5e)","status":"affected"},{"version":"15.2(4f)","status":"affected"},{"version":"15.2(6e)","status":"affected"},{"version":"15.2(6h)","status":"affected"},{"version":"16.0(1j)","status":"affected"},{"version":"15.2(6g)","status":"affected"},{"version":"15.2(7f)","status":"affected"},{"version":"15.2(7g)","status":"affected"},{"version":"16.0(2h)","status":"affected"},{"version":"15.2(8d)","status":"affected"},{"version":"16.0(2j)","status":"affected"},{"version":"15.2(8e)","status":"affected"},{"version":"16.0(3d)","status":"affected"},{"version":"16.0(3e)","status":"affected"},{"version":"15.2(8f)","status":"affected"},{"version":"15.2(8g)","status":"affected"},{"version":"15.3(1d)","status":"affected"},{"version":"15.2(8h)","status":"affected"},{"version":"16.0(4c)","status":"affected"},{"version":"15.3(2a)","status":"affected"},{"version":"15.2(8i)","status":"affected"},{"version":"16.0(5h)","status":"affected"},{"version":"15.3(2b)","status":"affected"},{"version":"16.0(3g)","status":"affected"},{"version":"16.0(5j)","status":"affected"},{"version":"15.3(2c)","status":"affected"},{"version":"16.0(6c)","status":"affected"},{"version":"15.3(2d)","status":"affected"},{"version":"16.1(1f)","status":"affected"},{"version":"16.0(7e)","status":"affected"},{"version":"16.0(8e)","status":"affected"},{"version":"15.3(2e)","status":"affected"},{"version":"16.0(8f)","status":"affected"},{"version":"16.1(2f)","status":"affected"},{"version":"16.1(2g)","status":"affected"},{"version":"15.3(2f)","status":"affected"},{"version":"16.0(9c)","status":"affected"},{"version":"16.1(3f)","status":"affected"},{"version":"16.0(9d)","status":"affected"},{"version":"16.0(6h)","status":"affected"},{"version":"16.0(8h)","status":"affected"},{"version":"16.1(3g)","status":"affected"},{"version":"16.0(9e)","status":"affected"},{"version":"16.1(4h)","status":"affected"}]}],"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-dsnmp-cNN39Uh","name":"cisco-sa-nxos-dsnmp-cNN39Uh"}],"metrics":[{"format":"cvssV3_1","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","baseScore":7.7,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-789","lang":"en","description":"Uncontrolled Memory Allocation","type":"cwe"}]}],"providerMetadata":{"shortName":"cisco","orgId":"d1c1063e-7a18-46af-9102-31f8928bc633","dateUpdated":"2026-02-25T16:26:28.329Z"},"exploits":[{"lang":"en","value":"The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."}],"source":{"advisory":"cisco-sa-nxos-dsnmp-cNN39Uh","discovery":"EXTERNAL","defects":["CSCwq57598"]}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-20048","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-02-25T18:18:11.351419Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-02-25T19:05:48.366Z"}}]}}}